Effect of frequency and interval of insecticide application on the control of primary transmission of Tomato Chlorosis Virus (ToCV) and Tomato Severe Rugose Virus (ToSRV) to tomato by Bemisia tabaci MEAM1

• Grant number: 22/09982-0
• Support Opportunities: Scholarships in Brazil - Doctorate
• Start date: October 01, 2023
• End date: August 31, 2025
• Field of knowledge: Agronomical Sciences - Agronomy - Plant Health
• Principal Investigator: Jorge Alberto Marques Rezende
• Grantee: Heron Delgado Kraide
• Host Institution: Escola Superior de Agricultura Luiz de Queiroz (ESALQ). Universidade de São Paulo (USP). Piracicaba , SP, Brazil
• Associated research grant: 18/18274-3 - Begomovirus and crinivirus in solanasceous: regional molecular epidemiology and sustainable integrated management alternatives, AP.TEM

Abstract

Tomato (Solanum lycopersicum) is one of the essential vegetables in Brazil and the world. The tomato crop has several fungal, bacterial, and viral diseases. Those caused by viruses are very important since they are difficult to control. Among these, the begomovirus tomato severe rugose virus (ToSRV) and the crinivirus tomato chlorosis (ToCV, transmitted by Bemisia tabaci, deserve to be highlighted due to their predominance. The epidemiological characteristics of the diseases caused by these viruses are similar in tomato plants. This is mainly due to the numerous shared hosts of these two viruses and because the same vector transmits them, and their simultaneous acquisition and transmission (mixed infections) are not uncommon. The control of diseases associated with these two viruses is complex, and producers often use the application of insecticides to control B. tabaci MEAM1 to minimize the damage caused by them. However, this alternative does not present the desired efficiency because insecticides usually cannot prevent the primary transmissions of these viruses, which occur mainly due to continuous influxes of viruliferous vectors from outside the plantations. In this work, we intend to evaluate the effect of exposure time of B. tabaci MEAM1 in mixed-infected tomato plants and sprayed with cyantraniliprole, flupiradifusone, and afidopyropen on the acquisition and transmission of ToSRV and ToCV to tomato plants in a greenhouse. To evaluate the effect of the frequency of application of the three insecticides in controlling the primary transmission of ToCV and ToSRV to tomato by B. tabaci MEAM1 in the field. The results will provide important information that will help develop management strategies for these viruses, optimize the use of insecticides and reduce the damage caused by these viruses in tomato crops. (AU)