Abstract
Plants with insecticidal effect are among the alternatives as a tool to control the insect-pest of stored grains. The objective of this study was to characterize the efficiency of plant-based powders on Sitophiluszeamaisinsects in stored grains. Usingfourteenplant species (Arnica montana Baccharistrimera,Coriandrum sativum,Coffea arabica,Cymbopogon martini,Helianthus annuus, Lippia gracillis,Mentha pulegium,Moringa oleífera,Nicotiana tabacum,Piper aduncum, Piper hispidinervum,Sesamum indicumandVitis labrusca)obtained from tritured vegetable material, and compared with a control treatment. The experiment carried out in a completely randomized design, with six replicates each treatment. In the tests, 0.5 g of the inert powders mixed into the grains (50 g) of hybrid corn AS 1551 into plastic vials and infested with 10emerged adultofS. zeamais. After 20 days of infestation, oviposition evaluated and counts of emerged adults. At the end of the infestation period, evaluated the dry weight of the insects, the weight of grains consumed and the period of development (egg-adult). Most of the vegetal powders presented effective action on the emerged insects. By the use of the powders,it verified reduction in the ooposition, except for Vitis labruscaand Sesamum indicumwhose egg numbers were higher than control, also had less effect on the development of caruncho larvae. The low weight of adults from corn kernels treated with Nicotiana tabacumpowder is relatedreduction in feeding of S. zeamaislarvae.
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