Manejo de Neoleucinodes elegantalis (Guenée) (Lepidoptera : Crambidae) em tomateiro : efeito ovicida, deterrência de oviposição e iscas tóxicas

Abstract

Among the pests that attack tomato, to the tomato fruit borer, Neoleucinodes elegantalis (Guenée) (Lepidoptera: Crambidae), is responsible for significant losses in productivity. It’s control is usually done by excessive insecticide applications. Thus, researches with new tactics that aims to reduce pesticides use are essential to better manage this pest. The present study evaluated the ovicide effect, oviposition preference, food preference, threshold of food intake, and toxic effect of insecticides associated with attractive food sources, seeking the control of N. elegantalis. The LCs50 for N. elegantalis eggs varied from 0.029 to 4.19% according to the following sequence of decreasing toxicity: deltametrin > NeemPro > Natunem® > Neemseto®. According to the toxicity rate, deltametrin was 144 times more toxic than Neemseto ®. The highest and lowest deterrence was obtained for Natuneem® and deltametrin, respectively. Thus, sucrose, molasses, honey and orange juice were selected to determine the threshold concentrationcapable of stimulating feeding of N. elegantalis adults. Sucrose and honey were the most attractive food sources, regarding the number of lands, landing time, and feeding time of adults of N. elegantalis. In contrast, only sucrose showed a positive correlation among the tested concentrations, the landing time, and the feeding time of adults and males. The toxic effect of insecticides associated with honey 10% was also tested. The insecticides did not affect negativelythe attraction of N. elegantalis adults. Carbaryl, cartap, deltamethrin, fenpropatrina, indoxacarb, lambda-cyhalothrin, and lufenuron caused 100% mortality in males and females and adults of N. elegantalis, after 24h exposure, suggesting that they are promising for using in toxic baits.