PLANTAS DE COBERTURA ASSOCIADAS À Pochonia chlamydosporia NO MANEJO DO NEMATOIDE DAS LESÕES RADICULARES NA CULTURA DA SOJA

Abstract

The root lesion nematode (Pratylenchus brachyurus) has caused high economic damage to the soybean crop in Brazil, due to its wide distribution and large increase in population density. Thus, the objective of the present work was to evaluate the efficiency of the association of cover crops with the fungus Pochonia chlamydosporia in succession with the soybean crop, in the management of the nematode Pratylenchus brachyurus. The test was carried out in a greenhouse, using a completely randomized experimental design (DIC) with eight treatments and eight replications, as follows: T1-Urochloa ruziziensis - Soybean; T2-Milheto ADR 300 - Soybean; T3-Urochloa ruziziensis - Soya + P. chlamydosporia; T4-Millet ADR 300 - Soybean + P. chlamydosporia; T5-Urochloa ruziziensis + P. chlamydosporia - Soy; T6-Millet ADR 300 + P. chlamydosporia - Soybean; T7-Urochloa ruziziensis + P. chlamydosporia - Soybean + P. chlamydosporia; T8-Millet ADR 300 + P. chlamydosporia - Soybean + P. chlamydosporia. At 45 days after sowing (DAI) of soybeans, fresh mass of roots, nematodes per 10 g of roots and 100 cm3 of soil were evaluated. The nematological data were subjected to analysis of variance and comparison of means by the Scott-Knott test at 5% significance. The treatment that showed the lowest value for the nematode reproduction factor was treatment six, the combination of millet ADR 300 + P. chlamydosporia followed by soybean planting.