Influência do silício e acibenzolar-S-methyl na indução de resistência à mosca-branca Bemisia tabaci biótipo B (Genn.) e no desenvolvimento do feijoeiro (Phaseolus vulgaris L.)

Abstract

Besides the climate, the insect-pest is an important factor for production loss in the bean plant culture. The whitefly Bemisia tabaci (Genn.) is one of the main species, and its biotype B is becomming more important at each harvest. In the search for other control measures, the resistance induction to insects has been well studied. Silicon and acibenzolar-s-methyl (ASM) are mentioned as examples of resistance inductors to insects. In this work, the objective was to evaluate the resistance induction to B. tabaci biotype B whitefly in bean plants through silicon and ASM application. Tests were conducted with and without choice of chance to oviposit on two bean plant cultivars (Carioca and Valente) and with and without silicon application. In the second experiment a test was conducted with choice of chance, in cultivar Carioca, treated with silicon, ASM and control. For the first experiment, in the test with choice of chance, the silicon application caused no preference for oviposition, reducing the number of eggs and nymphs of B. tabaci; in the non-choice test, the silicon application did not affect the oviposition of the whitefly and also the nymph developmente. In the second experiment, reduction was not observed in the preference for oviposition. However, there was reduction of the nymph development, mainly by the application of ASM. For the dry weight and the stem diameter, significant differences were not observed between the treated and non-treated plants.