Sublethal effects of azadirachtin, cypermethrin and methoxyfenozide on Habrobracon hebetor Say (Hym.:Braconidae)
Subject Areas :
Keywords: Habrobracon hebetor, Biorational insecticides, Population parameters, Ectoparasitoid wasp,
Abstract :
The Habrobracon hebetor Sayis an important ectoparasitoid of larval stage of various lepidopterous insect pests such as the families Noctuidae and Pyralidae. Because of the potency of the parasitoid for controlling several important lepidopteran insect pests, the effects of three insecticides were assessed on it. The wasps were reared on the last instar larvae of Anagasta kuehniella Zeller at 26±1°C, 70±5% RH and a photoperiod of 16:8 (L:D) h. The adult wasps were exposed to fresh residues of the insecticides. In this study, sublethal effects of cypermethrin, methoxyfenozide and two formulations of azadirachtin (BioNeem® and Neem guard®) were evaluated based on the life table and reproduction parameters of H. hebetor. The survivorship was affected by the insecticides. The maximum and minimum of life expectancy was observed in the control and cypermethrin, respectively. The maximum life span of females was estimated 40, 36, 30, 33 and 21 days in the control, BioNeem, Neem Guard, methoxyfenozide and cypermethrin, respectively. The highest net fertility rate was recorded in the control (93.64 eggs). Net fertility rate was affected significantly by Neem Guard treatment (53.69 eggs). Results showed that almost all insecticides excluding cypermethrin had less adverse effects on the parasitoid. Semi field and field studies aiming to assess efficacy of combined use of insecticides and H. hebetor is needed to obtain more applicable results.
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