Iranian Journal of Plant Protection Science

Iranian Journal of Plant Protection Science

Effect of mating and previous parasitism on functional response of Trissolcus djadetshkoe (Hym.: Scelionidae) an egg parasitoid of Eurygaster integriceps (Hem.: Scutelleridae)

Document Type : Research Paper

Authors
Farzaneh Abdi 1
Shahzad Iranipour 2
Mirjalil Hejazi 3
1 Former Graduate Student, Department of Plant Protection, Faculty of Agriculture, University of Tabriz, Tabriz, Iran
2 Associate Professor, Department of Plant Protection, Faculty of Agriculture, University of Tabriz, Tabriz, Iran
3 Professor, Department of Plant Protection, Faculty of Agriculture, University of Tabriz, Tabriz, Iran
10.22059/ijpps.2015.54728
Abstract
Trissolcus djadetshkoe Rjachowsky (Hym.: Scelionidae) is an egg parasitoid of sunn pest Eurygaster integriceps Puton (Hem.: Scutelleridae) in Iran. Searching efficiency of this species was determined in a functional response context. Effect of female insemination as well as parasitism experience was also investigated. Host densities of 2, 4, 7, 14, 28 and 56 eggs were offered to a single female in 20, 20, 15, 15, 10 and 10 replications in a 24 h experiment in 1.5×10 cm vials. Virgin vs. inseminated females as well as inexperienced vs. experienced ones were used in two sets of experiments. All experiments were conducted in a growth chamber (26±1 ºC, 50±10% RH, 16: 8 h photoperiod). Logistic regression and nonlinear regression model of random search were used for analysis. All parasitoid responses were type III. Experienced females showed lower parasitism in all densities. Maximum attack rate estimates were 14 in experienced females vs. 34 in inexperienced ones. It seems that previous reproductive efforts have depleted energy of the females. A lighter difference was observed in virgin females over inseminated ones (25 vs. 17). This difference probably concerns with costs of sex allocation for inseminated mothers.    
 
Keywords
experience of parasitism
effect of insemination
foraging behavior
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Iranian Journal of Plant Protection Science
Volume 46, Issue 1 - Serial Number 1
Spring & Summer
May 2015
Pages 131-139

  • Receive Date 15 December 2014
  • Revise Date 04 May 2015
  • Accept Date 06 July 2015