Compatibility of pesticides used in strawberry crops with predatory mites Stratiolaelaps scimitus (Womersley) and Cosmolaelaps brevistilis (Karg)


Stratiolaelaps scimitus (Womersley) and Cosmolaelaps brevistilis (Karg) (Acari: Laelapidae) are predatory mites of soil-inhabiting pests, mainly small insects. Fungus gnats fly species are found in greenhouse strawberry production and may be controlled with predatory mites, being important to know their compatibility with the pesticides used in strawberry crops. In this study, the compatibility of seven commercial pesticides used in strawberry cultivation with the predatory mites S. scimitus and C. brevistilis was assessed in laboratory conditions. Survival and oviposition rates were evaluated between 0.5 and 120 h after treatment (HAT). The results demonstrate that lambda-cyhalothrin treatment resulted in the lowest survival rate for both mites in the first evaluations, being moderately harmful, while spinetoran was slightly harmful to C. brevistilis. On the other hand, abamectin, azadirachtin, azoxystrobin + difenoconazole, iprodione and thiamethoxam were harmless for both mites and, oviposition rate was significantly different only at 72 and 120 HAT for S. scimitus and C. brevistilis respectively. These results may be used to develop guidelines for the adoption of selective pesticides in integrated pest management programs that conserves predatory mites.

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We are grateful to Anderson Dionei Grutzmacher, head of Laboratory of Integrated Pest Management (LabMIP), who kindly provided the pesticides used in this study.


Funding was provided by the Brazilian Federal Agency for the Support and Evaluation of Graduate Education (CAPES-Grant Number 88882.182253/2018-01 and 88882.306693/2018-01 for first and third author respectively) and the National Council for Scientific and Technological Development (CNPq-Grant Number 140328/2016-5 for second author).

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Correspondence to Adriane da F. Duarte.

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Duarte, A.d.F., de Bastos Pazini, J., Duarte, J.L.P. et al. Compatibility of pesticides used in strawberry crops with predatory mites Stratiolaelaps scimitus (Womersley) and Cosmolaelaps brevistilis (Karg). Ecotoxicology (2020).

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  • Soil predators
  • Laelapidae
  • Bradysia sp.
  • Integrated pest management