Toxicidade aguda tópica e inibidora alimentar de cumarina para lagarta-do-cartucho-do-milho

Abstract

The corn crop is produced today throughout the Brazilian territory, due to its great adaptability and its genetic heritage, which makes it quite susceptible to attacks by agricultural pest insects, for this, it is necessary to use chemical controls for these insect pests. The fall armyworm or military caterpillar, Spodoptera frugiperda, is considered the key pest of corn, attacking both the vegetative and reproductive organs of the plant. during the formulation of the pesticide mixture. The present work aims to determine the lethal concentration 50% of adjuvant (Coumarin) per surface of direct contact and phagoinhibitor for third instar larvae of S. frugiperda, analyzing the mortality of the adjuvant (Coumarin) on S. Frugiperda during a short period of time. period of time, being applied directly and indirectly on the caterpillar during the stage in which it is so that it can be observed if the adjuvant will have a phytosanitary action up to a certain dosage. The experiment was divided into two stages: acute topical toxicity test; phagoinhibition test. There was no acute topical toxicity and phagoinhibitory action of coumarin was detected for S. frugiperda larvae.