Toxicity of insecticides used in rice crop on the egg parasitoid Trichogramma pretiosum (Hymenoptera: Trichogrammatidae) under field conditions

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چکیده

ABSTRACT: We evaluated under field conditions the toxicity of insecticides previously identified as harmful in laboratory and semifield bioassays on parasitoid Trichogramma pretiosum (Hymenoptera: Trichogrammatidae). The experiments were conducted during 2019/20 2020/21 harvests rice fields. Following recommendations International Organization for Biological Integrated Control (IOBC), four applied 64 m2 experimental plots. Subsequently, T. was released inundatively. To verify parasitism rates, at 1, 2, 4 6 days after release (DAR) parasitoids, eggs from host Ephestia kuehniella (Lepidoptera: Pyralidae) offered. After determining number parasitized eggs, data grouped into a reduction coefficient (Ex) to provide single result effects parasitoid. For both crops, it found that 2 DAR, highest rates occurred. In contrast, no observed. Lambda-cyhalothrin, thiamethoxam, zeta-cypermethrin classified moderately harmful; thiamethoxam + lambda-cyhalothrin harmful. IOBC guidelines, these products is lower than obtained or semi-field pretiosum. However, should be avoided, used times do not coincide with presence field.

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ژورنال

عنوان ژورنال: Ciencia Rural

سال: 2023

ISSN: ['1678-4596', '0103-8478']

DOI: https://doi.org/10.1590/0103-8478cr20220055