Residual effects and foliar persistence of pesticides used in irrigated rice on the parasitoid Telenomus podisi (Hymenoptera: Platygastridae)

Rakes, Matheus; Pasini, Rafael Antônio; Morais, Maíra Chagas; Zanella, Renato; Prestes, Osmar D.; Bernardi, Daniel; Grützmacher, Anderson Dionei

doi:10.1007/s10340-021-01436-6

Cited by 2 publications

(4 citation statements)

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“…applications after rice emergence and before the flood period are considered frequent practices in irrigated rice fields in southern Brazil to manage S. frugiperda, which is exactly the period when the pest insect is most damaging to the crop (RAKES et al 2021b). During these periods, inundative releases and/or increases in the natural population density of the parasitoid in production areas should occur.…”

Section: Insecticidementioning

confidence: 99%

“…In the field, even if classified as moderately harmful (lamba-cyhalothrin, thiamethoxam and zetacypermethrin) and harmful (thiamethoxam + lambdacyhalothrin), the toxicity indices reported were lower than those described in the laboratory. The lower toxicity in the field situation may be associated with a greater degradation of the compounds by the action of climatic conditions (e.g., temperature and solar radiation), as well as related to product application, dosage, and plant metabolism (RAKES et al 2021b).…”

Section: Insecticidementioning

confidence: 99%

“…In addition, insects parasitoids may reduce oviposition when in contact with plants contaminated with agrochemicals (RAKES et al 2021b) since insecticides can cause repellent effects through "irritations" by acting on the central or peripheral nervous system, making individuals avoid these areas because of the chance of choice (PAIVA et al 2018). This is not observed in laboratory selectivity bioassays, where natural enemies are submitted to extreme conditions, i.e., with maximum contact with pesticides and no chance to choose and/or escape from contamination areas (HASSAN et al 2000).…”

Section: Insecticidementioning

confidence: 99%

“…Many factors can interfere with the toxicity of an active ingredient (RAKES et al 2021b) and the toxicity of the compound to natural enemies along the experimental sequence proposed by the IOBC can be reduced. Thus, we investigated the hypothesis that the toxicity of pesticides to T. pretiosum is lower when tested under field conditions.…”

Section: Introductionmentioning

confidence: 99%

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

Rakes

Pasini²,

Morais

et al. 2023

Cienc. Rural

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

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Section: Insecticidementioning

confidence: 99%

Section: Insecticidementioning

confidence: 99%