Resumo

CARDONA, R. Effect of green manure and Trichoderma harzianum on sclerotia population and incidence of Macrophomina phaseolina on sesame. Rev. Fac. Agron. [online]. 2008, vol.25, n.3, pp.440-454. ISSN 0378-7818.

In order to investigate the effect of the green manure of crotalaria and Trichoderma fungus on the number of sclerotia/ g of soil (SG) of Macrophomina phaseolina and the incidence of charcoal rot in sesame, a plot of 800 m² (40 m x 20 m) ca was selected in soil naturally infested in the experimental field "Turén" attach to the Research National Institute of Agricultural (INIA) Portuguesa, three trials were settle down, each one with a duration of two years, evaluating these treatments: a) green manure (GM) and absolute control (AC); b) GM, green manure + Trichoderma (GMT) and c) GM, GMT and AC. In both first trials, density of SG was evaluated, whereas in the last one, the incidence of charcoal rot in sesame was evaluated. The results indicates that the GM slows down the M. phaseolina development at the beginning, but when advancing the crop cycle the levels of inoculums reaches equal values to the AC; whereas the GMT treatment showed diminution in the SG throughout the cycle in comparison with the treatment GM. In the third essay, a high significant difference (P£0.01) in the incidence of charcoal rot with the GMT treatment constitutes a viable alternative for controlling M. phaseolina in sesame.

Palavras-chave : Crotalaria juncea; green manure; sclerotia; biological control; Sesamun indicum.