The survival of mycelium and sclerotia of Rhizoctonia solani AG1-1C was studied in Eucalyptus sp. litter treated with the antagonists Trichoderma longibrachiatum (UFV-1) and T. inhamatum (UFV-2 and UFV-3) isolates. For 12 months, R. solani survival in Rhizoctonia infected eucalypt leaves, was apparently not affected by environmental factors, nor by possible naturally occurring antagonists. On the other hand, the sclerotial rate survival decreased progressively reaching 26%. The influence of Trichoderma spp. isolates did not affect R. solani survival in eucalypt-infected leaves, but significant and continuous reduction of sclerotia viability was observed when compared to captan treatment, 25 days after treatment with the antagonists. The survival in the fungicide treatment reached significantly low levels in the first evaluation, but its efficiency decreased with time. Progressive reduction and continuous survival of sclerotia was detected in the control as well, but significantly less than any other treatment.
leaf bligth; byological control; litter
