EVALUATION OF THE POTENTIAL USE OF THE HYPERPARASITE Dicyma pulvinata (Berk. & M. A. Curtis) IN THE BIOLOGICAL CONTROL OF RUBBER TREE [Hevea brasiliensis (Wild. ex A. Juss.) Muell. Arg.] SOUTH AMERICAN LEAF BLIGHT [Microcyclus ulei (Henn) Arx] IN SÃO JOSÉ
2009
Leila Cristiane Delmadi | Daniel Cassetari Neto | Vander de Freitas Rocha
Mato Grosso was the Brazilian state with the largest extension in rubber tree (<em>Hevea brasiliensis</em>)<em> </em>plantation, with 45,727 hectares of monoculture in 2002. The occurrence of the "South American Leaf Blight" caused by <em>Microcyclus ulei</em> <em>(Mycosphaerellaceae, Dothideomycetidae)</em>, considered the main disease of the rubber tree, is a limiting factor to the implantation of new enterprises. A promising option, the biological control, could permit the solution of this phytosanitary problem. The objective of this work was to evaluate the potential of hyperparasite <em>Dicyma pulvinata</em> (anamorph) on <em>Microcyclus ulei </em>control in comparison with the chemical control. Experiments were conducted in the field and in a greenhouse in the district of San José do Rio Claro (MT). Applications in 3 different concentrations of <em>Dicyma pulvinata </em>besides the active ingredients Benomyl and Mancozeb were done. In the field, the major control percentages were obtained with the pulverization of Benomyl and of 8,1 x 10<sup>6</sup> or 1,215 x 10<sup>7</sup> conidia/ml of<em> Dicyma pulvinata</em>. In the greenhouse, the best results were obtained with the pulverization of 2,025 x 10<sup>7 </sup>or 3,037 x 10<sup>7 </sup>conidia/ml.
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