EFFICIENCY OF INSECTICIDES IN THE CONTROL OF Spodoptera frugiperda (J. E. Smith 1797) (LEPIDOPTERA: NOCTUIDAE) ON COTTON CROP

Abstract

A trial was carried out in Acreúna, Goiás State, Brazil, from March to April of 2002, to test the efficiency of insecticides to control Spodoptera frugiperda (J. E. Smith 1797) on cotton – cv. Delta Opal. The treatments applied and their respective doses of commercial product were: spinosad (75 mL.ha^-1, 100 mL.ha^-1, 125 mL.ha^-1 and 150 mL.ha^-1), methoxifenozide (500 mL.ha^-1), clorpirifós (800 mL.ha^-1), and control. In all of the treatments, except for control, it was added 2,0 L.ha^-1 of vegetable oil. Six points (replications) were marked in the central row of each treatment strip, spaced about 100 m, around which evaluations were performed, counting the number of alive caterpillars in fifteen plants. The insecticides were sprayed two times at ten-day intervals. The countings were realized at there, five, seven, and ten days after the first application, and at three, five, seven, ten, and fourteen days after the second application. The treatments with spinosad at 100 mL.ha^-1, 125 mL.ha^-1 and 150 mL.ha^-1 were efficient in controlling S. frugiperda on cotton up to seven days after treatment application.

KEY-WORDS: Gossypium sp.; spinosad; clorpirifós; methoxifenozide.