PLANTAS VOLUNTÁRIAS EM LAVOURAS DE TOMATE PARA PROCESSAMENTO INDUSTRIAL: INFLUÊNCIA DA ROTAÇÃO DE CULTURAS E INCIDÊNCIA DA MANCHA BACTERIANA

Abstract

Tomato (Solanum lycopersicum L.) is considered the second most economically important vegetable in the world, being a demanding crop in phytosanitary care. Bacterial stain caused by bacteria of the genus Xanthomonas is one of the most important diseases for industrial processing. The work was carried out in commercial tomato crops for industrial processing in different municipalities of the State of Goiás, where the effect of the off - season period on the incidence of volunteer tomato plants in tomato farms for industrial processing was evaluated, as well as the presence of Bacterial spot in these plants at the beginning of cultivation. The crops were chosen based on the inter-harvest periods between the tomato crop. 9 areas were sampled, 2 of which corresponded to 2 years of crop rotation, 4 to 1 year of rotation, 1 area with crop succession and 2 areas as a control, which were never planted with industrial tomatoes. The quantification of volunteer tomato plants was carried out in each area and gives incidence of plants with typical symptoms of bacterial spot. The confirmation of the diagnosis in these symptomatic plants was made through the collection of samples and laboratory analysis. For this purpose, isolates, pathogenicity tests were carried out on seedlings in greenhouse and molecular identification of the species of the isolates obtained. The data were analyzed statistically where the areas with succession of culture presented a high incidence of voluntary plants, in relation to the other periods, where the plants submitted to the pathogenicity test confirmed the presence of Xanthomonas perforans. The objective of this work was to determine the importance of volunteer plants as inoculum sources of tomato bacterial spot in crops for processing and the effects of crop rotation on areas with bacterial spot incidence during tomato growing periods