USO DE Cotesia flavipes (cam.) NO CONTROLE DE Diatraea saccharalis,(fabr.) EM CANA-DE-AÇÚCAR NA ZONA DA MATA NORTE DE PERNAMBUCO

Abstract

The sugarcane (Saccharum officinarum) belongs to the Poales order, and the Poaceae family, from Asia, has extensive cultivated areas in Brazil, but many problems can occur beyond the water deficit for its loss of productivity, such as for example the incidence of pests in the crop. Diatraea saccharalis (Fabricius, 1794) is the most important because of the frequency with which it occurs, so that there is a reduction of the damage caused to the culture, biological control can be used. The parasitoid Cotesia flavipes belongs to the order Hymenoptera and the family Braconidae, which parasites the larva, which is the most recommended and used, since it generates better results. The release of the wasp to control D. saccharalis occurs depending on the population density of the drill, to know when and when to release the parasitoids. With this, it is necessary to survey the D. saccharalis drill at the Olho d'água Central Plant, located in the city of Camutanga-PE, and subsequently evaluate the release of the biological agent C. flavipes to know the efficacy of its parasitism. There were performed surveys, drill count / area of the plots that presented possible infestations, being used for this purpose lots of different mills located in the plant. To be released after lifting it is necessary to know the rate of infestation, with 320bwt / ha infestation low, 640bwts / there is average infestation, 960 bites / high infestation and 1280 severe infestation. After 20 to 30 days of C. flavipes release, another field survey was conducted to evaluate the efficacy of the biological control. There were variations of intensity in the infestation of the parasite D. saccharalis, in the different lots of the evaluated mills. With the application of C. flavipes there was a decrease from 50% to 66% of the infestation. The use of C.flavipes as a biological control agent for the reduction of D. saccharalis in the sugarcane crop was very effective, with efficiency higher than 50% in most of the lots studied.