Alternative methods of biological control in maintaining the viability of stored coffee seeds

摘要

The objective of this work was to evaluate the efficiency of different alternative methods of biological control in maintaining the viability of coffee seeds. For the control of fungus contamination in seeds, dehydrated and powdered medicinal plants in doses of 200 g kg-1 of seed, were tested with chemical fungicides mancozebe (Dithane? NT 4 g kg-1 of seed), potassium sorbate (300 g L-1) and sodium?benzoate (300 g L-1 ) and three biological products, Trichodermil? SP (1 g kg-1 of seed), Trichodel? (50 g kg-1 of seed) and Trichoplus? (50 g kg-1 of seed). Samples of 200 g of seeds were conditioned in three different packages: polypropylene flasks, kraft?paper?bags and polyethylene + nylon?bags. After, they were stored in cold chamber at 16 ± 3°C of temperature, for a period up to 15 months with evaluations for each three months. Seeds conditioned in kraft?paper?bags presented percentage of germination higher than those conditioned in polypropylene flasks or polyethylene + nylon?bags. In seeds treated with rosmarin, garlic and Trichoplus?, there was a reduction in the total microbial, and the best germinated on 12 and 15 months of storage.