تاثیر غلظت زیرکشنده‌ی حشره‌کش‌های سیرینول و سایرومازین بر واکنش تابعی زنبور اکتوپارازیتوئید Habrobracon hebetor Say (Hym.: Braconidae) رویZeller (Lep.: Pyralidae) Ephestia kuehniella

Functional response is one of the important behavioral characteristics of natural enemies in assessment of parasitoids efficiency for biological control programs. In this research, the effect of botanical insecticide sirinol (produced based on oily extract of medicinal plant garlic) and a new IGR compound called cyromazine (chitin synthesis inhibitor) were investigated on the functional response of Habrobracon hebetor as on of the important natural enemies of Noctuidae and Pyralidae pests. For investigation the functional response; firstly sixty mated females of H. hebetor (under 24 h old) were treated with sublethal concentrations (LC30) of sirinol and cyromazine that were determined 4.04 and 1.58 mg a.i./L respectively with contact exposure method in 10 cm Petri dishes and after for 24; live females were transferred separately to the densities 2, 4, 8, 16, 32 and 64 of Ephestia kuehniella fifth instar larvae and after 24 hour, the number of parasitized larvae was recorded in each Petri dish. The experiment was carried out at 26±1°C, relative humidity of 70±5 % and a photoperiod of 16: 8 (L: D) h in eight replication for each treatment. Finally, the data were analyzed by SAS software and Holling model in two stages. According to the obtained results in first stage, none of the insecticides changed the type of functional response compared with the control (type III). In the second stage that were done by using logistic regression, it was determined that the highest and lowest attack rates (a) were in the control (0.050 h-1) and cyromazine (0.034 h-1) treatments, the highest and lowest handling time (Th) in cyromazine (0.648 h) and the control (0.415 h) treatments and the highest and lowest theoretical attack rate (T/Th) in the control (57.82) and cyromazine (37.03) treatments belonged. The results of this research confirm the negative effects of sirinol in comparison with cyromazine on the functional response of the ectoparasitoid wasp and suggest the synchronize application of sirinol and H. hebetor in integrated pest management (IPM) programs.