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Articles by G.M. Balestra
Total Records ( 2 ) for G.M. Balestra
  Gh. Khodakaramian , A. Heydari and G.M. Balestra
  Investigation of antagonistic activity of selected Pseudomonads bacterial strains against Xanthomonas axonopodis pv. citri the causal agent of citrus bacterial canker disease was carried out in the laboratory and greenhouse conditions. Results of in vitro experiments showed that all bacterial strains were inhibitory on X. citri with various antagonistic activities. The most effective strains were selected and were evaluated in the greenhouse against citrus canker disease. Results of greenhouse experiments in application of antagonistic bacterial strains to control X. axonopodis pv. citri the causal agent of citrus bacterial canker disease were promising and selected strains reduced the number of disease spots between 23.8 to 64.0%.
  A. Heydari , I.J. Misaghi and G.M. Balestra
  Two field experiments were conducted in Safford and Tucson, Arizona to investigate the impact of three pre-emergence herbicides (pendimethalin, prometryn and trifluralin) on the efficacy of commonly used fungicides (metalaxyl, triadimenol and thiram) against Rhizoctonia solani a soil borne fungus causing cotton seedling damping-off. Pendimethalin, prometryn and trifluralin were applied to the field soil at the recommended field concentrations of 0.9, 1.3 and 0.7 kg active ingredient (a.i.) ha-1, respectively. In both field trials, seed treatment with fungicides caused a significant (p<0.05) decrease in fungal pathogenicity based on the number of emerged cotton seedlings, relative to the control (not treated with the fungicide). In Tucson trail, only one of the test herbicides (pendimethalin) interfered with the ability of fungicides to reduce the pathogenicity of Rhizoctonia solani on cotton seedlings 15, 25 and 50 days after sowing. In Safford trial, the effectiveness of fungicides on fungal pathogenicity was reduced in the presence of pendimethalin and prometryn, 15, 25 and 50 days after sowing. Trifluralin showed no significant effect on the activity of fungicides in both field trials.
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