Search published articles


Showing 988 results for Rahi


Volume 0, Issue 0 (Articles accepted at the time of publication 2024)
Abstract

In semiotics, the denotative relationship is established between the three aspects of the sign, the object, and the interpretation of the same sign, and symbolic processes find endless meanings and this relationship classifies the symbolic, indexical and iconic species. Proverbs are taken from the context of a linguistic community that form multiple meanings and show gender construction. with semiotic studies, the significations of the opposition between man and woman in proverbs can be investigated. In this article, the concept of gender in proverbs of Tati language is investigated with Peirce's semiotic model in order to evaluate and analyze the reflection of their linguistic elements in all kinds of signs. Based on the result, Tati proverbs are mostly in the form of symbolic signs. The highest frequency is objectification and then otherness. The symbolic contrast between male and female gender and the discourse order and hierarchical position of this concept in the form of ideas of superiority/inferiority, value/worthless, human/animal, authoritarianism/weakening, center/periphery, self/other, norm/abnormal, friend/ Enemy and Dominant/Dominant have been classified and conceptualized. This opposition represents the idea of the otherness of the female gender and the superiority of the male gender over it as a dominant discourse. Based on this, the gender structure of this concept can be shaped in relation to the language type of Tat tribes of Northern Khorasan.

Volume 0, Issue 0 (Articles accepted at the time of publication 2024)
Abstract

Rhetorical questions are those that, according to time and local condition, have a function, beyond rhe gaining awareness and information. In addition to having an interrogative structure, these sentences imply another meaning as the secondary meaning. But in some cases, according to a special textual context, the existence of one or more weak implicit meaning or meanings between the semantic superstructure in rhetorical questions and main implicit meaning, can be proved and caught. These weak implicit meanings can neither be ignored nor be considered as the main secondary meaning. Based upon that, the problem which is stated in this research is that, with regarding to the possibility of catching such implicit meaning(s) from rhetorical questions , what is the nature and statuse of these additional implicit questions? And assuming acceptance of their existence, whether the production of meaning in rhetorical questions is still instantly? or according to the proposed theory in this research, the production meaning approach in rhetorical questions includes some processes and levels?
The approach of this research is analytic-applied approach and case study in some poems of prominant persian poets that there is a positinal stop in the structure of these poems. The results of this research reveals that , based on the author's prediction, the production of meaning in rhetorical questions has a process approach with three levels, in which, a second meaning layer is produced between superstructure and main implicit meaning (third semantic layer), that can be named as mediator semantic layer.

Volume 0, Issue 0 (Articles accepted at the time of publication 2024)
Abstract

This study sheds light on Ben Lovatt's idiosyncratic characterization, cognitive impairment, and peculiar perception of the world through the lens of cognitive and stylistic features such as schema and cognitive theories. It explores Ben's inability to make meaningful sense of the outside world, his failure to activate adequate schemata when necessary, and his foregrounded conceptual metaphor. Exploring Ben's foregrounded linguistic and cognitive patterns reveal that Ben, in many aspects, proves the particular belief in the story that he seems to be on the threshold between humanity and animality or a throwback who belongs to centuries ago. However, despite Ben's human-animal hybridity, the most striking point about the analysis of Ben's mind style is that Ben seems to be beyond the descriptions of other characters and has a particular way of seeing the world, which makes him seem different from others. This difference, eventually, causes his exclusion from the world and his suicide.
 

Volume 0, Issue 0 (Articles accepted at the time of publication 2024)
Abstract

The question of research is to what extent the translator has reflected the function of source text in the system of target text, and has followed the style of source text in conveying the meaning? The authors used a descriptive-analytical method based on the Systemic Functional Approach of Halliday and Matthiessen. They aimed to compare the thematic structure of one poem in Rumi's Masnavi and its English translation and answer the following questions:
1. According to Halliday’s Functional Theory, how were the theme types used in this poem of Masnavi
 and its translation?
2. Considering the comparative analysis of thematic structure in the source and target texts, what changes occurred in the textual meaning of the translated text? And to what extent has the translator been successful in transferring the concepts?
According to Halliday's model, the application frequency of topical and multiple themes as well as the marked and unmarked types in the clauses of two poems were calculated. The translator has been successful in translating 90% of the clauses containing unmarked themes and has been less successful in translating 66.6% of the clauses with marked themes and in conveying the meaning and emphasis intended by the author because of not considering the style of source text in theme markedness. Considering Halliday’s Approach of Equivalence in Translation, similarity in using the theme types in source and translation texts can indicate translator's adherence to the style of source text in conveying the textual meaning and achieving functional equivalence in translation process.
 

Volume 0, Issue 0 (Articles accepted at the time of publication 2024)
Abstract

The Historical Ashura books are historical reflections of the Ashura event and they are expressed in the form of narration. The application of new theories of literary criticism in the analysis of historical provides a better understanding of the narrative context of these works. The purpose of this study is to introduce an unknown Ashura historical book and its narratology from Todorov's point of view. This article tries to examine the syntactic level of narration in the book Sar-e-Asrar in a descriptive-analytical way. So that narratives better illustrates the narrative structure of such works. Todorov's narrative analysis is one of the most prominent structuralist approaches that deals with manifestations such as syntactic representation. According to the findings of the research, the narration with its developments, propositions, etc., which show the syntactic manifestation of the narration, has advanced the design of the narration. In terms of linguistic structure, the murder is based on the traits and actions of the characters. From a syntactic point of view; It has ten basic enhancements that include a minor enhancement. According to the findings of the research, the narration with its developments, propositions, etc., which show the syntactic manifestation of the narration, has advanced the design of the narration. In terms of linguistic structure, the book is based on the traits and actions of the characters. From a syntactic point of view; It has ten basic enhancements that include a minor enhancement. Descriptive and present propositions have emerged side by side with various narrative aspects...

Volume 0, Issue 0 (Articles accepted at the time of publication 2024)
Abstract

As a trigger to communication, motivation still includes undiscovered aspects which require further investigation. Hence, considering the newly proposed dual continuum model of motivation, this study investigated the relationships among willingness to communicate (WTC), active/passive motivation, and foreign language achievement (FLA) among 216 high school English as a foreign language (EFL) learners. The modified version of the active/passive motivation scale (APMS) was revalidated using confirmatory factor analysis (CFA). Structural equation modeling (SEM) revealed significant relationships among active/passive motivation, L2WTC, and FLA. Additionally, six models were proposed for the prediction of learners’ L2WTC and FLA. The findings indicated that socio-cultural and sensory-perceptual active motivation as well as cognitive and sensory-perceptual passive motivation significantly predict learners’ L2WTC, while only cognitive active motivation predicts FLA. Furthermore, passive motivation predicts FLA in all sub-constructs. Finally, active motivation is a negative predictor of FLA if mediated by L2WTC. Overall, the study highlights the importance of passive as well as active motivation in promoting WTC and improving FLA among EFL learners.

Volume 0, Issue 0 (Articles accepted at the time of publication 2024)
Abstract

The historical novels The Golden Falcon  and The Flares of the City of Otrar  narrate the life of Jalal al-Din Khwarazmshah. Unlike ancient historical texts in which the simple and predictable process of action by the central actor of the hero takes place, in these works, by creating active and anti-active characters, the actions deviated from their main stream, leading to the actions of deviation, substitution, action error and ... have become. The purpose of this research is to investigate how actions deviate within the narrative and damage such as action error, action change or even action collapse. For this purpose, the theory of action-discourse system of Greimas has been used to examine the action narratives related to the character of Jalal al-Din in the two historical novels The Golden Falcon and The Flares of the City of Otrar. In The Golden Falcon's novel, the deviation of action is seen as the transformation of action and the destruction of action by actors; A place where efforts have been made to reach Jalal al-Din's valuable object and save his life. In this novel, according to the value object "Beloved" and "Homeland" Jalal al-Din is depicted as a "lover" and "patriot". In The Flares of the City of Otrar, deviation of action can be seen as transformation of action and replacement of action. Most of the characters in the story and Jalal al-Din himself play the role of antagonists and try to distance Jalal al-Din from his valuable object and destroy him.
 

Volume 0, Issue 0 (Articles accepted at the time of publication 2024)
Abstract

The present research aimed to investigate the effect of multilingualism on learning English as a third language, focusing on foreign language anxiety (FLA) and foreign language enjoyment (FLE). A sample of 353 Iranian bilingual and multilingual EFL learners participated in the study by completing self-report scales measuring FLA and FLE. As for the qualitative phase, a number of 15 EFL learners took part in semi-structured interviews. The results revealed that multilingual participants reported lower levels of FLA and higher levels of FLE than their bilingual counterparts. The results of the qualitative data also supported the findings of quantitative phase, suggesting that multilingualism can have a substantial impact on reducing FLA and enhancing FLE when learning a foreign language. The study highlights the potential benefits of multilingualism for language learners and might have significant implications for theory and practice.
 

Volume 0, Issue 0 (Articles accepted at the time of publication 2024)
Abstract

Mirajnamehs are narrative poetry that refer specifically to the Ascension of the Prophet Muhammad (PBUH). The creators of these poetic texts have composed their works by imitating or slightly changing the prior ones. Following the approach of Searle’s speech act and Genet’s hypertextuality, the analytical –descriptive method, and library research tools, this article explores the structural and linguistic interplay of Mirajnamehs. It was hypothesized that the poetic texts were hypertextually connected and the contemporary narrators consciously followed the prior narrators in composing their poems. Examining 26 similar sequences indicated that not only the works of Sanai and Khaqani with 17 subordinate poets were hypotexts of other texts, but also Sanai, Qawwami, Akhsikati and Molana were not subordinate to other poets; moreover, it clarified that contemporary poets had a greater tendency for the change rather than the imitation; in addition, it revealed that the quantitative generative transformation of the aesthetic expansion type as well as the applied transformation of the qualitative internal type had a higher frequency; furthermore, it showed that the most diverse speech acts were those of Helali and the most frequent ones belonged to Khajoo. All things considered, detailing, adding figures of speech and act episodes and actors, description, educational and moral discussions, creating a contrast between two concepts or characters, creating dialogues and using auxiliary characters were the reasons for the high frequency of speech acts in similar sequences.
 

Volume 0, Issue 0 (Articles accepted at the time of publication 2024)
Abstract

Mehdi Sahabi s’est essayé, pendant des années,  à l’atelier de Proust et ce faisant,  il a atteint à un certain degré de mûrissement. En traduisant A la Recherche du Temps, il a voulu faire œuvre, comme dit Antoine Berman.  Les Plaisirs et Les Jours, livre d’un jeune auteur qui demande reconnaissance, préfigure déjà  La Recherche, malgré la différence compositionnelle et thématique entre les deux ouvrages. Dans cet article, en nous basant sur les procédés techniques de la traduction énumérés et exemplifiés par Vinay-Darbelnet dans leur théorie de La Stylistique comparée, nous cherchons à analyser le processus de la traduction de ce  recueil proustien. L’objectif est de connaître d’abord la méthode de traduction dee Sahabi et la manière dont il  a procédé,  et  de savoir ensuite  si la théorie appliquée est efficace dans la lecture d’un texte littéraire traduit. Les premier et second  objectifs, pour être atteints, ont besoin de la mise en présence des deux textes et de l’explication de l’opération traduisante. A priori, les projets traductifs de Sahabi semblent ciblistes et orientés vers le lecteur, mais il  est le traducteur des choix inattendus et peut nous surprendre. Par ailleurs, l’applicabilité de cette théorie linguistique au texte proustien  déterminera son efficacité dans la critique de la traduction littéraire.
 

Volume 0, Issue 0 (Articles accepted at the time of publication 2024)
Abstract

Waitance is a cognitive and psychological concept that reflects the tendency to anticipate the occurrence of good or bad events without the need for effort or specific activity in Iranian culture. The aim of this qualitative and applied research is to examine the waitance cultuling in light of the conceptual model of cultuling analysis in Iranian culture. To this end, 435 individuals were asked in April 2024 to express their views on sentences that represent the cultural aspects of waitance through semi-structured interviews. The results showed this cultural aspect is used with high frequency in both public and private formal and informal settings among individuals with informal relationships, by both genders, and more by middle-aged and elderly individuals and individuals from lower and middle social classes. Individuals with tones such as friendly and intimate, hopeful, desperate and hopeless, caring, angry, serious, humorous, and pragmatic use this cultural aspect with goals such as attracting attention, providing hope and comfort, encouraging patience, avoiding responsibility, seeking comfort, advising, referring problems to higher authorities, and so on. This mentioned cultural aspect, with high frequency and positive/negative emotions, indicates patterns of low trust, collectivism, short-term planning, idealism, and high waitance among Iranians. By analyzing these linguistic utterances, individuals can be made aware of the hidden culture within them and take steps toward euculturing and understanding the flawed genes of society.
 

Volume 0, Issue 0 (ARTICLES IN PRESS 2024)
Abstract

The current study evaluated the interactive impacts of water temperature and feeding rate on digestive enzymes, intestine histology, growth and stress-related genes, and cultivable intestinal microbiota of Asian seabass (Lates calcarifer). For this purpose, 180 fish (85.0±3.0 g) were reared at three different temperatures (20, 27, and 33 °C) and two feeding rates (apparent satiation and 2.5% of biomass) with three replications for 6 weeks. The results revealed no significant differences among different treatments regarding the activity of digestive enzymes (P˃0.05) of fish reared under different temperatures and feeding rates. The length, width, and thickness of intestinal villi were unaffected by different temperatures and feeding rates (P˃0.05). In addition, no variations were found in the total aerobic bacterial count of fish gut from different experimental groups (P˃0.05). At the molecular level, IGF-I and HSP70 coding genes were found to be highly expressed in experimental treatments (P<0.05). To conclude, present results showed that temperatures between 27 to 33 °C are more optimal for Asian seabass, and the different temperatures and feeding rates do not affect digestive enzymes, intestine histology, and gut microbiota after 6 weeks. Further molecular research is needed to unravel the complex impact and mechanisms of feeding rate and different rearing temperature on fish physiology.

Volume 0, Issue 0 (ARTICLES IN PRESS 2024)
Abstract

This study investigated the effects of irrigation strategies including sustained deficit irrigation (SDI) and partial root-zone drying (PRD) on the growth, physiology, and photosynthesis of strawberry plants in order to maximize crop productivity while maintaining water resources. This experiment has four irrigation strategies (FI: control (full irrigation volume), PRD1 (full irrigation volume), PRD2 (50% of FI), and SDI (50% of FI) and two fertilizer strengths (EC1 and EC2) with four replicates per treatment. Gas exchange, leaf chlorophyll index, stomatal conductance (gs), and maximum quantum efficiency of PSII photochemistry (F'v/F'm) were assessed on three occasions throughout the experimental duration in order to monitor the impact of different irrigation strategies on photosynthesis. Yield water use efficiency, as well as TSS (total soluble solids) and TA (total titratable acidity), two fruit quality-related parameters, were also measured. In the final stage, PRD2-EC2 photosystem II efficiency was 9% higher than SDI-EC2. Also, the PRD strategy effectively influenced and regulated the adjustment of stomatal conductance (gs). In diluted fertilizer (EC2), yield WUE of PRD1 and SDI performed 15% and 30.7% lower than FI-EC2. However, PRD2-EC2 treatment increased 72.5% more than the control. Our observations of leaf and fruit deficiencies showed that the PRD strategy had long-term benefits for the plant and reduced water consumption. However, to establish a sustainable irrigation strategy, the nutrient solution must be adjusted to control growth and photosynthesis attributes.


Volume 0, Issue 0 (ARTICLES IN PRESS 2024)
Abstract

This study aimed to determine the effects of energy levels and sources on growth performance, antibody titers, and the gene expression of pro-inflammatory cytokines in broilers exposed to heat stress. 450 one-day-old Ross chickens were assigned to six dietary treatments and five replicates in a completely randomized design. Chickens have received diets differentiated by main energy source (corn grain and soybean oil) and energy level (equal, 3 or 6% lower or higher than Ross 308 recommendation). Treatments were as follows: corn grain and equal as control (CON), corn grain, 3% lower (T1), corn grain, 6% lower (T2), corn grain and soybean oil, equal (T3), corn grain and soybean oil, 3% higher (T4), corn grain and soybean oil, 6% higher (T5). The room temperature was increased to 34 °C (6-h daily) from day 12 to 42 of age to induce heat stress. The highest corticosterone level was observed in the T1, T2, and T5 groups. The lowest antibody titers were observed in the T2 group and the highest expression levels of pro-inflammatory cytokines genes were in chickens receiving T5 diet. The highest feed conversion ratio (FCR) during the grower and finisher periods was observed in T2, and the lowest FCR was observed in T3 and T4 groups. It was recommended to feed Ross broiler chickens with a diet containing oil instead of a part of grain based on energy recommended by the strain recommendation.
 

Volume 0, Issue 0 (ARTICLES IN PRESS 2024)
Abstract

Mediterranean fruit fly, Ceratitis capitata Wiedeman (Diptera: Tephritidae), is one of the most important pests of horticultural crops in tropical and subtropical regions of the world. In this study, the developmental rate of Mediterranean fruit flies was studied at 10, 12, 15, 17, 20, 25, 27, 30, 32, and 35°C. The results showed a nonlinear relationship between temperatures and developmental rate. The best nonlinear models were Perfomance-1 and Performance-2 in the Mazandaran and Fars provinces, respectively. These models simulated the developmental rate of Mediterranean fruit flies accurately at temperatures ranging from 15 to 35 and 20 to 30°C, in Mazandaran and Fars provinces, respectively and the estimated optimal temperature of total immature stages was 31.94 and 31.8°C, respectively. The lower and upper temperature threshold the total immature stage in Mazandaran and Fars provinces were estimated at 11.23 and 13.15 °C,  and  38.1 and 37.74 °C, respectively. The two linear models, the Ikemoto linear model showed better-fit data compared with the ordinary model.


Volume 0, Issue 0 (ARTICLES IN PRESS 2024)
Abstract

As climate change intensifies the frequency and severity of droughts, adaptive behavior becomes increasingly crucial. Farmers' capacity to modify their practices in response to evolving climate conditions is vital for ensuring long-term agricultural sustainability and food security. Therefore, this study aims to investigate the psychological factors affecting farmers' adaptation behaviors in response to drought, using the health belief model. The sample comprised 380 farmers from Kohdashat County in Lorestan Province, western Iran, selected via a three-stage cluster sampling method. Data were collected using a researcher-designed questionnaire, whose validity and reliability were confirmed. Structural equation modeling (SEM) results indicated that self-efficacy; perceived benefits, perceived vulnerability, and perceived barriers explained about 49% of the variance in farmers’ adaptation behavior. Perceived benefits emerged as the strongest predictor of adaptation, while cues to action and perceived severity were insignificant. These findings support the health belief model's practicality and effectiveness in examining water conservation behavior among Iranian farmers.
 

Volume 0, Issue 0 (in press 2024)
Abstract

Accurate analysis of bitumen behavior as a viscoelastic material and its natural phenomena such as aging are important issues in pavement engineering. Therefore, controlling the low and high temperature properties of bitumens is essential to prevent low temperature cracking and common high temperature distress in order to provide proper service throughout the pavement life. In this study, the aging phenomenon and its effects on the mechanical properties of bitumens were simulated using the Superpave method, namely the RTFOT method for short-term aging and the PAV method for long-term aging. In order to investigate the effect of repeated PAV cycles on the properties of bitumens, three types of bitumen with different penetration degrees of 40-50 (PG70-16), 60-70 (PG64-22) and 85-100 (PG58-28) were selected and three samples of each were subjected to one to three PAV aging times. The beam shear rheometer (BBR) test was performed at three temperatures from 0 to -12°C and the dynamic shear rheometer (DSR) at seven temperatures from 46 to 82°C. Based on the results obtained, the high temperature performance of the bitumens increased by a maximum of three grades and their low temperature performance increased by a maximum of two grades. In other words, the grading of the triple bitumens, after three times of PAV, became 82-4, 82-10, and 70-16, respectively. Also, the relationship between the high temperature performance properties of the aged bitumens and their chemical changes at different times of aging was investigated and their changes were examined to show the correlation between these properties. The results showed that the high temperature viscoelastic properties and the chemical aging index of the different bitumens had a strong linear relationship with a coefficient of determination (R2) of more than 0.9.

Volume 0, Issue 0 (Articles accepted for Publication 2024)
Abstract

Aim and Introduction
After the global economic recession in 2008-2009, the discussion about countercyclical and procyclical fiscal policies and their effects on the economy began. Countercyclical fiscal policy is applied to reduce economic fluctuations by adjusting government spending and taxes against the business cycle. The aim of this policy is to stabilize the economy and flatten its fluctuations. On the contrary, procyclical fiscal policy strengthens economic fluctuations in the direction of business cycles. On the other hand, fiscal sustainability refers to the government's ability to maintain expenditures, income and public debt at a certain level in the long term without jeopardizing economic stability or facing a fiscal crisis. A sustainable fiscal policy ensures that the government's debt in the long run is at a level proportional to the size of the economy. The main questions of this research are as follows:
  • Is Iran's fiscal policy countercyclical or procyclical?
  • Is Iran's fiscal policy sustainable?
  • What is the effect of cyclical fiscal policy and fiscal sustainability on the Iranian economic growth?
  • How is the mutual relationship between fiscal sustainability and cyclical fiscal policy in Iran?
Methodology
The evaluation of fiscal policy cyclicality and fiscal sustainability and their determinants have been previously researched. However, the effect of cyclical fiscal policy and fiscal sustainability on economic growth and their mutual relationship has not been covered. This research, has utilized Iran's 1970-2021 annual data and a state-space model with time-varying parameters and an autoregressive distributed lags model as well as Kalman filter method. Moreover, to evaluate Iran's cyclical fiscal policy and fiscal sustainability, the effect of cyclical fiscal policy and fiscal sustainability on economic growth have been investigated. The research also deals with the mutual effect between cyclical fiscal policy and fiscal sustainability in Iran.
Findings
In this research, in order to evaluate the cyclical behavior of Iran's fiscal policy and obtaining the index, a state-space model with time-varying parameters, is estimated in which the real GDP logarithm coefficient varies over time. Then, in order to assess Iran's fiscal sustainability and obtaining the index, a state-space model with time-varying parameters is estimated. Finally, an autoregressive distributed lags model is utilized to estimate the effect of cyclical fiscal policy index and fiscal sustainability index on economic growth, as well as estimating the mutual effect between cyclical fiscal policy index and fiscal sustainability index.
Discussion and Conclusion
The findings of this research show: First, Iran's cyclical fiscal policy index estimated in all years is positive and has not recorded a negative number in any year, which means that the fiscal policy implemented in Iran during the period 1970-2021, was procyclical. In other words, the fiscal policy implemented in Iran has increased the range of fluctuations of cycles and for this reason, it has made the Iranian economy vulnerable to the economic shocks. Second, the estimated Iran's fiscal sustainability index is negative in most years so that the average fiscal sustainability index in the entire period is -0.068. This indicates the unsustainability of Iran's fiscal policy in the period 1970-2021.  The trend of the smoothed changes of the time-varying parameter related to the fiscal sustainability index is also downward, which means that Iran's fiscal sustainability has been weakening over time and has moved in the direction of unsustainability. Third, Iran's cyclical fiscal policy index has had a negative effect on economic growth. In other words, procyclical behavior of Iran's fiscal policy has slowed down the economic growth rate. Fourth, Iran's fiscal sustainability index has a negative and significant effect on economic growth. Based on the estimated fiscal sustainability index, unsustainability is evident within Iran's fiscal policy. Therefore, unsustainability of Iran's fiscal policy has weakened economic growth. Fifth, Iran's fiscal unsustainability has increased the procyclical behavior of fiscal policy and as a result, exacerbated the fluctuations of economic cycles. Sixth, the increasing Iran's cyclical fiscal policy index reduces the reaction of the primary balance to the government debt. In other words, the increase in the procyclical behavior of the fiscal policy weakens Iran's fiscal sustainability


Volume 0, Issue 0 (9-2025)
Abstract

Mayetiola destructor (Say, 1817) originated in the Fertile Crescent region of the Middle East and is one of the most serious pests of wheat, rye and barley and more than 16 Poaceae wild species. Here, we report the occurrence of this species as an invasive pest for the first time in Iran. It was detected in wheat fields and rye in Qüshchï Pass, Urmia environ, West Azarbaijan province (September 2020) as well as in wheat fields in Bil-e Savar, Ardabil province (July 2024). The diagnostic characters and its life history as well as the photographs of the adult male and female, larvae, puparium, male genitalia and wing venation are provided. This is the second species from the genus Mayetiola that has been reported from Iran. To prevent the spread of this destructive pest in Iran, suitable management practices are urgently needed.

Volume 1, Issue 1 (3-2012)
Abstract

This study was conducted to evaluate the age-specific functional response of Psyllaephagus zdeneki Noyes & Fallahzadeh (Hymenoptera: Encyrtidae) at different nymph densities of olive psyllid, Euphyllura pakistanica Loginova (Hemiptera: Psyllidae). Due to parasitoid behaviour of feeding and parasitizing the host, both traits were separately explored on a daily functional response. Results of logistic regression revealed a type II functional response of the wasp independent of their ages. The handling time (Th) and searching efficiency (a) were estimated using the Rogers equation. The highest searching efficiency for both parasitism and feeding was observed in the first five days of the adult age. The handling time for parasitism and host feeding increased with the age of female wasp. The highest searching efficiency and shortest handling time for host attacked (Parasitism and feeding) were gained in day 5 and day 2 and maximum parasitism and host feeding in days 2 and 3 of adult female age, respectively. We conclude that P. zdeneki demonstrated a reasonable performance as a potential biocontrol agent by feeding and parasitism of E. pakistanica which gained its maximum efficiency within 2 to 5 days of its life.

 



Page 1 from 50    
First
Previous
1
...