PREFERÊNCIA DE Diatraea saccharalis E Diatraea flavipennella (Lepidoptera: Crambidae) EM VARIEDADES DE CANA-DE-AÇÚCAR E PARASITISMO POR Cotesia flavipes (Hymenoptera: Braconidae)

Abstract

One of the factors that limit the productivity of Saccharum spp. is the occurrence of pests that cause losses both the reducing sugar available for the grinding, as the decrease of sugar per ton of sugarcane. The replacement of chemical control by the biological is becoming a reality, reason can be attributed to the great advances in research in relation to this type of control. The objective of this study was to determine the preference of the parasitoid Cotesia flavipes in field conditions on Diatraea saccharalis and / or Diatraea flavipennella in varieties of sugarcane. The varieties used for the experiments were RB-867515, RB-92-579, RB931011 and RB863129 Saccharum spp. The experiments were performed in Camaratuba Experimental Station belonging to ASPLAN, Camaratuba - PB. For each variety of sugarcane were defined three areas of 10 m x 10 m, which were georeferenced. Tests were performed with chance and no chance of choice and preference test with D. saccharalis and D. flavipennella. The largest Cotesia flavipes parasitism rates are found in RB867515 and RB92579 varieties. The parasitoid C. flavipes had no preference for particular species of Diatraea. It was observed that there was no difference between C. flavipes parasitism even when he had no chance or choice on D. saccharalis and D. flavipennella. The presence of natural enemies and the manipulation of the stem may have influenced the parasitism studies. In tests with chance and no choice, we found a higher parasitism in RB-867515 variety. There was a preference of caterpillars D. saccharalis and D. flavipennella by RB-867515 variety.