Épocas de aplicação do espiromesifeno no controle de brevipalpus phoenicis (geijskes) (acari: tenuipalpidae) em cafeeiro

Abstract

From the factors that affect the coffee production, the damages caused by the mite Brevipalpus phoenicis (GEIJSKES) have a significant economical expressiveness and, its importance on this plant culture happens due to the vector of the ringspot virus, responsible for the leaf fall and for the reduction of the coffee quality. The recommended season for the chemical control of this mite is after the harvest, when the production damage had already occurred, because the peak of this mite blight occurs before the coffee harvest. The mite insecticide espiromesifeno acts inhibiting the lipid synthesis and it has ovicidal effect over B.phoenicis, showing effectiveness on this mite control for a short-term period after the application and being promising on the mite control for a long-term period, due to its residual effect on the mite fecundity. This way, aiming to keep the mite B.phoenicis in low population, through the early start of the chemical products application, two scientific experiments were conducted at the experimental station of Bayer CropScience, Fazenda São Jorge in Araguari- MG from October 2011 to October 2012. The first one had as an objective the evaluation of three doses of espiromesifeno for the mite control after the harvest, having as a parameter the products espirodiclofeno and abamectina. On the second experiment, it was tested the effectiveness of three doses of espiromesifeno, applying them three seasons before the harvest, aiming to hinder the mite population on the crops and to test the anticipation of the chemical control application. The experiments were carmed out in different gashes where for the tests evaluation it was done the headcount of the number of mites in branches and in coffee fruits taken from the medium and lower level of the plant were counted. In both experiments it was analyzed the long and short term effectiveness of the product. Up to thirty days after the application, espiromesifeno was effective in all tested doses. Espiromesifeno, as on doses of 120 gia ha-1 as on 144 gia ha-1, performed the best control of B.phoenicis in relation to abamectina and espirodiclofeno when evaluated 232 days after the application. The early application of espiromesifeno for the chemical control of the mite B. phoenicis was efficient in all tested seasons and used doses (96, 120 e 144 gia ha-1) and prevent mite outbreak, showing that it isn t necessary to wait the harvest period to do the pulverization.