In the past years, the whitefly Bemisia tabaci has been causing numerous losses in potato crops, not only due to feeding behavior, but mainly because it transmits economic importance viruses. One of the most important virus in potato crops is the Tomato chlorosis virus (ToCV), genus Crinivirus, transmitted in a semi-persistent manner by Bemisia tabaci, and reported for the first time in Brazil in 2006 in tomato plants. The main method used to control whitefly and the transmission of ToCV to potato crops is the chemical control, which aims to control the insect vector. However, besides the fact that this method is not very efficient to control the virus, this specie of whitefly shows resistance to a vast majority of pesticides available. In this way, the present study aims primarily to evaluate the effect of different insecticides on feeding behavior of non-viruliferous and ToCV-viruliferous whiteflies, using the Electrical Penetration Graph (EPG) technique on potato plants ('Ágata'), and also to perform a greenhouse transmission assay using different periods after the insecticides application. It will be used the insecticides: Mospilan (acetamiprid)- widely used for whitefly control; Benevia (ciantraniliprole) and Sivanto (flupiradifurone), new insecticides developed for whitefly control. This makes it possible to correlate the feeding behavior data with those of transmission in the greenhouse, that will determine which insecticide(s) are efficient(s) in the control of B. tabaci, concomitant with the reduction of ToCV transmission rate, such a way that the application in the field be more effective for the control of vector and virus.
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