Efficiency of insecticides applied to seeds and leaves of corn in the control of fall armyworm.
- The fall armyworm Spodoptera frugiperda (J. E. Smith, 1797) (Lepidoptera: Noctuidae) is a major pest of corn in Brazil, requiring a high cost control measures. The objective of this study was to determine the effectiveness of insecticides applied in seed treatment and foliar sprays of corn in insect control. Two experiments were conducted, 2009/10 and 2010/11 seasons in a randomized block design with four replications. In 2009/10 were studied: imidacloprid (ST), thiamethoxam (ST), imidacloprid + betacyfluthrin (FS), lambdacyalothrin + thiamethoxam (FS), carbofuran (ST), lufenuron (FS). In 2010/11 were studied: flubendiamide (FS), betacyfluthrin + imidacloprid (FS), deltamethrin (FS), lambdacyalothrin + thiamethoxam (FS), cypermethrin (FS), lufenuron (FS), spinosad (FS), imidacloprid (ST), imidacloprid + thiodicarb (ST). The insecticides imidacloprid (400 mL 100 kg-1) and thiamethoxam seed applied to maize seedlings protected from attack by caterpillars up to 10 days after emergence, whereas flubendiamide insecticides, cypermethrin and lufenuron conditioned and a lower rate of damaged plants.