Avaliação das variedades RB (República do Brasil) de cana-de-açúcar em relação ao ataque das principais pragas em Rio Largo, estado de Alagoas

Abstract

This study was to evaluate the performance of varieties RB (Republic of Brazil) from sugar cane in relation to the attack of Diatraea spp., Mahanarva spp and Telchin licus licus. We used the cropping systems of rainfed and irrigated. The varieties in cultivation of rainfed studied were: RB72454, RB867515, RB971755, RB951541, RB931003, RB92579, RB863129, RB93509 and. Included in the irrigated crop is RB98710. In the first year of cultivation in the dry system, it was found that the leafhopper infestation of the root in the variety RB867515, was significantly higher than those observed for other varieties. In the second year was not possible to identify a range characteristic of preference by the pest. The results of irrigated cultivation showed that the infestation of M. fimbriolata were statistically similar, we could not identify with feature a variety of preference by the pest. The last survey occurred during the harvest, which allowed evaluating the complex drill rot of Diatraea spp. and infestation of T. licus licus. The results showed that when compared on the basis of complex drill / rot at the harvest, the first year of lifting the cultivation of drought, indicated that the varieties RB92579, RB867515, RB93509 and RB863129 were significantly less damaged by the attack of Diatraea spp. than the variety RB971755. In the second year it was found that the variety RB931003 and RB93509 were the most attacked by the pest. For irrigated crops, when compared on the basis of complex drill rot, the variety RB93509 showed greater tolerance to the attack drills. In evaluating the first and second year, the variety RB71454 was the most infested by giant drill. In the irrigated crop varieties RB98710 and RB971755 were significantly less infested than the giant drill varieties RB72454 and RB863129.