PhD in Agricultural Entomology, Department of Plant Health, São Paulo State University (Unesp), School of Agricultural and Veterinarian Sciences, Jaboticabal, 14884-900, Brazil.
PhD Student in Agricultural Entomology, Department of Plant Health, São Paulo State University (Unesp), School of Agricultural and Veterinarian Sciences, Jaboticabal, 14884-900, Brazil.
Sci Rep. 2021 Mar 5;11(1):5271. doi: 10.1038/s41598-021-84871-w.
Spodoptera frugiperda is a pest of economic importance for several crops with resistance reports to Bt crops and pesticides. Eco-friendly Bt biopesticides may be an alternative to chemical insecticides due to their selectivity and specificity. However, the efficacy of Bt biopesticides may be influenced by the association with other chemicals, such as adjuvants. This study evaluated the compatibility and toxicity of Bt biopesticides mixed with adjuvants for the control of S. frugiperda. The treatments included the association of Dipel SC and Dipel PM with adjuvants. Compatibility tests were used to evaluate the Bt mixture. Bt suspensions obtained from mixtures of Bt and adjuvants at 10 and 3 × 10 spores/mL were used to evaluate S. frugiperda mortality and distilled water was used as the control. The addition of the adjuvant LI increased growth and sporulation, indicating compatibility with Bt biopesticides. The other adjuvants were toxic to reducing Bt growth and sporulation. Only the mixture of Bt with LI and Bt alone was effective to S. frugiperda. The addition of adjuvants to Bt biopesticide affect the Bt sporulation, growth and mortality.
草地贪夜蛾是几种作物的重要害虫，对 Bt 作物和杀虫剂有抗药性报告。由于其选择性和特异性，环保型 Bt 生物农药可能是化学杀虫剂的替代品。然而，Bt 生物农药的功效可能会受到与其他化学物质（如助剂）联合使用的影响。本研究评估了 Bt 生物农药与助剂混合用于防治草地贪夜蛾的相容性和毒性。处理包括 Dipel SC 和 Dipel PM 与助剂的联合使用。相容性测试用于评估 Bt 混合物。将 Bt 和助剂以 10 和 3×10 孢子/mL 的浓度混合得到的 Bt 悬浮液用于评估草地贪夜蛾的死亡率，以蒸馏水作为对照。助剂 LI 的添加促进了 Bt 的生长和产孢，表明与 Bt 生物农药相容。其他助剂则对 Bt 的生长和产孢有毒。只有 Bt 与 LI 的混合物和单独的 Bt 对草地贪夜蛾有效。助剂的添加会影响 Bt 的产孢、生长和死亡率。
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