Effects of Phosalone, Pyridalil and Fenpyroximate on Bracon hebetor life history parameters

Document Type : (original research)

Author

Department of Plant Protection, Tabriz Branch, Islamic Azad University, Tabriz, Iran

10.22034/aej.2022.321869.2718

Abstract

Bracon hebetor Say (Hymenoptera: Braconidae), is one of the important ectoparasitoid on larval stage of many lepidopterous pests especially Noctuidae and Pyralidae. These wasps are used widely in biological control programs. Every year a variety of pesticides are used in cotton fields, which affects natural enemies such as B. hebetor. In this research, lethal and sub-lethal effects of commonly used pesticides in cotton fields such as Phosalone, Pyridalil and Fenpyroximate, on B. hebetor were evaluated under laboratory conditions (25±1ºC, 60±5 r.h. and a photoperiod of 16L: 8D h). In this research, lethal and sub-lethal effects of commonly used pesticides in cotton fields such as Phosalone, Pyridalil, and Fenpyroximate, on B. hebetor were evaluated under laboratory conditions (25±1ºC, 60±5 r.h. and a photoperiod of 16L: 8D h). In the next stage of study, bioassay experiments by application of dipping were carried out on immature B. hebetor. The effects of field recommended concentrations of the pesticides were assessed on the larval and pupal stages of B. hebetor according to IOBC standard methods‚ thus the results showed that every of three pesticides were classified as slightly harmful. Assessment of pesticides sub lethal effects on adult warps which were exposed to LC25 revealed, stable population parameters, biological and reproductive parameters were influenced by this pesticide. The mean value of Net reproductive rate (R0) and intrinsic rate of increase (rm) for phosalone, pyridalil and fenpyroximate, were calculated 33.78±0.71, 26.35± 0.45 and 40.76±2.43 female/female/generation and 0.21, 0.18 and 0.23 female/female/day, respectively. Comparison of means using Tukey's test (p<0.05) shows that, different between the means is significant. Also negative effects of pesticides on parasitoids unknow well but our results showed that the order of toxicities of the insecticides on B. hebetor was as follows: phosalone > pyridalil > fenpyroximate and fenpyroximate is suitable pesticide for interment pest managements.

Keywords

Main Subjects

References

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Journal of Animal Environment
Volume 14, Issue 3
October 2022
Pages 393-398

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