Meloidogyne incognita na cultura do tomate: levantamento e manejo com produtos biológicos
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2015-02-24
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Universidade Federal de Goiás
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The tomato crop is attacked by a high range of pathogens, and among them are the nematodes of genera Meloidogyne. Among the various methods of controlling these pathogens, biological control has stood out on the world stage. The nematode survey is a necessary measure to plan and achieve the appropriate management. This study aimed to make a nematode survey in different producing areas of tomatoes in the vicinity of Goiânia-GO, evaluate the efficiency of different biological products in reducing Meloidogyne incognita population in the tomato crop, and to evaluate the most effective dose of a product based on Bacillus and Trichoderma. In this study nematode survey was performed in the tomato-producing areas of the surroundings of Goiânia-GO for a better understanding of the genera occurring in this crop. Also, four experiments were conducted: two to evaluate different doses of the biological product NemOutTM (Bacillus spp. and Trichoderma longibrachiatum) and two to evaluate different commercial biological products in reducing Meloidogyne incognita population and promoting tomato growth. The survey was conducted on ten tomato areas, in two consecutive years. Soil and root samples were collected and performed the extraction of nematodes and the identification of genera. The experiments were conducted in a greenhouse at the Universidade Federal de Goiás, in polyethylene pots (5L) containing sterilized substrate 1: 1 (soil + sand) in two periods, from March to May and October to December of 2014. Inoculation was made with 2,000 eggs and J2 of M. incognita. At 45 and 65 days after inoculation (DAI) the variables plant height, fresh weight shoots, fresh weight of root, galls index and egg mass index, nematode density and reproduction factor (RF), were evaluated. Producing tomato areas around Goiania-GO showed presence of genres Meloidogyne sp., Pratylenchus sp., Helicotylenchus sp., Criconemella sp. and Tylenchus sp. There was a greater abundance and dominance of Helicotylenchus sp. and Meloidogyne sp. on tomato areas studied. The use of crop rotation and fallow were effective in reducing the population of the genera found in the study area. Saturations of higher bases were positively correlated with the population density of Helicotylenchus sp., Pratylenchus sp. and Criconemella spp. and negative with the population density of Meloidogyne sp. At 45 DAI, in the first experiment, increasing doses of NemOutTM reduced the nematode population density and de reproduction factor (RF) linearly. In tested conditions the biological products NemOutTM, Nemat®, Paecilomyces JCO®, Serenade® and isolated P. chlamydosporia Pc-10 did not affect the development of tomato plants. The Serenade® product reduced index of galls and egg mass equaling the chemical in some cases.
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SILVA, J. O. Meloidogyne incognita na cultura do tomate: levantamento e manejo com produtos biológicos. 2015. 76 f. Dissertação (Mestrado em Agronomia) - Universidade Federal de Goiás, Goiânia, 2015.