RESIDUAL EFFECTS OF PESTICIDES IN PEACH ORCHARDS ON THE MAIZE WEEVIL Sitophilus zeamais (COLEOPTERA: CURCULIONIDAE)
2016
SANDRO DANIEL NÖRNBERG | ANDERSON DIONEI GRÜTZMACHER | DORI EDSON NAVA | RICARDO ALEXANDRE VALGAS | ÂNGELO LUIS OZELAME
ABSTRACT The aim of this study was to evaluate the residual effect of pesticides sprayed on peach orchards on S. zeamais. The study consisted of two experiments, according to the method of pesticide application. For Experiment I, pesticides were directly sprayed on peach trees and in Experiment II, the application of pesticides was performed under laboratory conditions. In both Experiments, the effect of pesticides was assessed in laboratory through the release of ten weevils per peach fruit. The effect of treatments was assessed by variable number of surviving insects. The results for pesticides [a.i. (ml or g.100L)] have shown that application of treatments in the field (Experiment I), malathion (200) presented persistence at 1DAT (Days after treatments spraying) and control higher than 80%, and thiametoxan (30) up to 3 DAT , while for phosmet (200) and fenthion (100), the control percentage was over 70% at 1 DAT . Under laboratory conditions, the application of the same insecticides showed control of 100% at 120 HAT (Hours after treatment application). In this context, the use of insecticides by spraying plants must be considered an alternative method for the control of S. zeamais in peach, being necessary to the development and adoption of new control tools for its management.
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