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Population dynamics of vector thrips, relationship with the incidence of viruses in peanuts and management tools


During the 2012 to 2015 and 2019/20, areas of commercial peanuts showed high incidence of virus symptoms, commonly known as "tomato spotted wilt". An initial survey identified Groundnut ring spot virus (GRSV) as the main causal agent. Along the southeastern region of the United States, a similar disease has been occurring over the last fifteen years, and in this case, the species was identified as Tomato spotted wilt virus (TSWV). GRSV and TSWV belong to the genus Orthotospovirus, family Tospoviridae, and are transmitted by thrips, when infected during the first or at the beginning of the second instar. In the United States, Frankliniella fusca (Hinds) and Frankliniella occidentalis (Pergande) are the prevailing vector species. In Brazil, these species are not reported as damaging to peanuts, but Enneothrips flavens (Moulton) is known as a key pest for the peanut crop. In preliminary surveys of the virus infected areas, a large number of Frankliniella schultzei (Trybom) was found in peanut flowers. In the United States, the reduction of virus damages to the peanut crop have been achieved through various management practices such as recommendation of cultivars that show some level of resistance or tolerance , as well as the indication of the better planting time, use of higher plant density and planting on minimum tillage. In the state of São Paulo, there is no information about insecticides and cultivar resistance to virus, and neither knowledge about other management practices to reduce virus severity. And so, the objective of this project is to study the spatiotemporal dynamic of the virus and its relationship with the population of thrips in peanuts; Identify and/or confirm the virus species (s) that cause the disease; Evaluate the dynamics of the initial population of thrips and the progress of viruses related to insecticide use; Tests of transmissibility of the virus with the species of thrips that occur in peanuts and; Evaluation of peanut cultivars and breeding lines from the IAC Program regarding the degree of resistance to the disease. For this, surveys will be carried out in two peanut-producing regions. (AU)

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