Biocontrole de fungos em sementes de melão (Cucumis melo L.): análise fisiológica e sanitária.

Abstract

Melon (Cucumis melo L.) is a plant whose fruits have great economic and social importance in Brazil. Among the factors that limit the achievement of high yields in melon cultivation in Brazil are diseases. Most pathogens are transmitted through seeds and the use of formulas based on Trichoderma spp. has been widely studied, because the fungus is used as a biocontrol agent and to promote plant growth, due to its mechanisms of action. The objective was to determine the efficiency of using Trichoderma harzianum for the microbiolization of melon seeds in different concentrations, aiming to establish biological control of fungi. For the health test, the treatments used were the control, chemical treatment and Trichoderma harzianum at concentrations of 50g, 100g, 150g and 200g of Trichoderma harzianum / 100kg of seeds at a concentration of 1.0 x 1010. In the germination test, they used the same health treatments were used, evaluating the percentage of germination, dead and hard seeds and seedling length. The treatments were distributed in a completely randomized design. The data were subjected to analysis of variance. Regression analysis was performed for quantitative data with the significance of the models verified by the F test. The following fungi were identified in the seeds: Alternaria sp., Aspergillus sp., Fusarium sp. and Penicillium sp. Dosages of 50, 100, 150 and 200g of Trichoderma harzianum/100kg seeds at a concentration of 1.0 x 1010 were efficient in reducing the fungi Alternaria sp., Aspergillus sp., Fusarium sp. and Penicillium sp. The dosage of 150g of Trichoderma harzianum/100kg seeds at a concentration of 1.0 x 1010 was efficient in the physiological development of melon seeds (Cucumis melo L.).