The fall armyworm is one of the most important pest on corn fields. It causes enormous losses almost every year. In order to know the effects of some chemicals against the caterpillars, a study was conducted under field conditions in Piracicaba, State of São Paulo, Brazil, durin December of 1983. Plants were sprayed (200 liters per hectare) with a twenty liter costal manual sprayer. The treatments were nine: A - check (nothing was applied). B - moncrorophos, 240 g; C - biphenthrin 10 g; D - triazophos, 200 g; E - carbamate UC 75118, 150 g; F - monocrotophos, 400 g; G - acephate, 375 g; H - carbamate UC 76724:, 150 g; I - c lofentezine, 250 g. The quantities mentioned above are of active ingredient used per hectare. Two days after the spray, the best pesticides were triazophos and biphenthrin. After 07 days no one product had a good efficiency.
fall armyworm; chemical pesticides; corn