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Study of lethal and sublethal effects of pesticides hexaflumuron and Imidacloprid on Trichogramma brassicae
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Mahboobeh Sharifi *    , Zeinab Rafighi , Bahareh Rafiei , Saeedeh Javar |
| Plant Protection Rresearch Department, Golestan Agricultural and Natural Resources Research Center, Agricultural Research, Education and Extension Organization (AREEO), Gorgan, Iran , mahboobehsharifi67@yahoo.com |
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Abstract: (224 Views) |
Nowadays, in order to reduce the consumption of pesticides and their side effects, the use of biological control method for pest has gained significant importance worldwide. Considering the importance of the adverse effects of insecticides on biological agents, this research evaluated the lethal and sub lethal effects of two pesticides, hexaflumuron (Consult®) and imidacloprid (Confidor®), on different parameters by dipping parasitized eggs and exposing adult Trichogramma to the residues of the pesticides. LC50 was calculated using the Polo-Pc software after contamination through dipping method. The LC50 values after 24 hours were determined as 71.25 ppm for imidacloprid and 123.05 ppm for hexaflumuron, which resulted in the highest mortalities at this time. The lowest parasitic potential of the insecticide was related to the concentration of 41.78 ppm for imidacloprid at LC40. The lowest survival rate of the wasp exposed to the pesticide residues was associated with a concentration of 2000 ppm, which was zero on the first day and increased to 50% and 66.33% by the end of the sixth day for imidacloprid and hexaflumuron, respectively. The results indicated that the residual effect of the pesticides was less pronounced on the dipped eggs, and both pesticides exhibited lethal effects. Based on the obtained survival rate and parasitism potential, imidacloprid showed higher toxicity compared to hexaflumuron, although the difference was not statistically significant. It is recommended to consider a minimum time interval of 72 hours between insecticide spraying and the release of Trichogramma wasps.
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Article number: 4 |
| Keywords: Biological control, Imidacloprid, Hexaflumuron, Dipping method, Residual effect |
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Type of Study: Research |
Subject:
Biosafety
Received: 2024/01/8 | Accepted: 2024/04/29 | Published: 2024/08/28
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