Field Efficacy of Eight Insecticides on Spodoptera frugiperdain Guangdong and Their Evaluation

【Objective】The control effects and investment ratio of control efficacy of eight insecticides on Spodoptera frugiperda in Guangdong were compared.【Method】According to the Pesticide-Guidelines for the Field Effi cacy Trials, field trials were conducted in corn fields to evaluate the control effects of eight insecticides, such as lufenuron 50 g/L EC, emamectin benzoate 5% WDG and chlorantraniliprole 200 g/L SC, mamestra brassicae nuclear polyhedrosis virus 20 billion PIB/L SC, and etc.【Result】The highest control effects were 70.75%, 66.75%, 92.23%, 75.21%, 84.29%, 92.52%, 88.12% and 71.41% under treatments of deltamethrin 25 g/L EC, lambda-cyhalothrin 25 g/L EC, lufenuron 50 g/L EC, avermectin 1.8% EC, emamectin benzoate 5% WDG, chlorantraniliprole 200 g/L SC, mamestra brassicae nuclear polyhedrosis virus 20 billion PIB/L SC and beauveria bassiana 300 billion spore/g WP, respectively. The ratios of control effects and costs corresponding to the treatments above were 11.60, 5.56, 13.56, 8.05, 9.00, 18.76, 42.13 and 87.50, respectively.【Conclusion】Under the condition of limited pesticide budget, emamectin benzoate 5% WDG is recommended; under the condition of adequate pesticide budget, lufenuron 50 g/L EC and chlorantraniliprole 200 g/L SC are recommended. Mamestra brassicae nuclear polyhedrosis virus 20 billion PIB/L SC can be used for biological control of S. frugiperda larvae.