Controle de fitonematoides com diferentes genótipos de soja, manejo e rotações de cultura em Iepê-SP

Abstract

Phytonematoids represent one of the main phytosanitary problems in cultivated plants, such as soybeans. Thus, the present work aimed to compare different genotypes of soybean susceptible (Nidera-6700) and resistant (BRS-7380) to nematodes, management (fallow) and different succession cultures (corn and Crotalaria spectabilis) for the control of phytonmatoids present in a commercial area in the city of Iepê in the interior of the state of São Paulo. In order to carry out the work, an area with symptoms of the presence of nematodes was chosen where 4 initial analyzes were carried out to homogenize the population of phytomatodes in the area. After this survey, 6 treatments were divided (1-BRS-7380 + Corn; 2- BRS-7380 + C. Spectabilis; 3- Fallow + Corn; 4- Fallow + C. spectabilis; 5- NIDERA-6700 + Corn; 6- NIDERA - 6700+ C. spectabilis) with 4 repetitions, in plots of 24m² each. The cultural treatments carried out were in accordance with the management of the producer because it is a commercial area. Analyzes of the phytomatomate population were carried out at the end of the soybean crop cycle and another at the end of the corn crop cycle. Nematodes (H. dihystera, P. brachyurus, Meloidogyne spp. And Tylenchorhynchus sp.) Were found. C. spectabilis proved to be efficient in the control of H. dihystera when successor to BRS-7380 and successor to fallow management. The cultivar BRS-7380 proved to be effective in controlling the population of P. brachyurus compared to NIDERA-6700. The incidence of Tylenchorhynchus sp nematodes was favored by the presence of spontaneous plants from fallow management.