Culturas de segunda safra sobre Pratylenchus brachyurus e Helicotylenchus spp. no Norte do estado de Mato Grosso

Abstract

the damage caused by nematodes in economically important crops such as soybeans are known. Among the most important are those of the genus Meloidogyne, Pratylenchus and Heterodera. One of the most appropriate alternatives to the control has been crop rotation and the use of resistant cultivars. The study aimed to evaluate the influence of different cultures second crop on the population of the nematode and the nematode Helicotylenchus spp., and on crop productivity. The experiment was conducted at Embrapa Agrosilvipastoril during agricultural year 2012/13, 2013/2014 and 2014/15, 0.4 ha of tracks. During the 2012/2013 harvest soybeans is planted in every area. In the second crop in 2013, two cultivars of corn, two soybean and corn intercropping with B. ruziziensis. In the season 2013/14 again it was sown soybeans and the second crop in 2014 were sown three soybean cultivars, a cultivar of corn and intercropping of millet with C. ochroleuca. In the season 2014/15 soybean was sown in every area and in the off-

2 season 2 cultivars of maize and 3 soybean cultivars. It was observed that millet consortium and C. ochroleuca was effective in controlling the nematode. There were differences of reactions not only among species but within species and between the genotypes and soybeans, interfering with the population of the P. brachyurus. In the season 2013/2014 the soybean yield was influenced by the treatments, but the harvest 2014/2015 there was no statistical difference. Regarding the behavior of Helicotylenchus spp., Treatment consists of soybean BRS 8180 RR showed higher population of nematodes present in the roots and lower the soil when purchased with corn BRAS 3010.