Effect of Brassica carinata seed meal, green manure and dried plant residur on garlic white rot (Sclerotium cepivorum), growth and yield.

Three pot experiments were conducted at Haramaya University, Ethiopia in the 2004 and 2005 to evaluate the effect of Brassica carinata seed meal,green manure and dried plant residue on white rot (Sclerotium cepivorum) of garlic.Six rates of seed meal (0,2.5,5,10,20, and 25g), green manure and dried plant residue (0,20,40,60,80, and 100g) each per kg of pathogen infested soil were used in the experiments.For each experiment, the treatments were arraged in randomised completeblock design in four replications.Infested soilwere used in the experiments.for each experiment, the treatments were arragedin randomised complete block design in four replications infested soil with out B. carinata amendments was used as a control.Data on seedling emergence, plant height, white rot incidence, number of harvested bulbs and bulb wight were measured.The infested soil amendment with the treatments promoted the growth of the plant, and taller garlic plants were observed from teated pots.The amendments of infested soil with B carinata seed measl,green manure and dried plant residue reduced the incidence of white rot and increased bulb weight.In corporation of seed meal at 10,20 and 25g/kg of soil significantly decreased white rot incidence (0%) and increased bulb wight by 43-51% as compared with unamended soil.Green manure amendments with B. carinata lines having high glucosinolates reduced disease incidence up to 2-20.7% and Brassica line with medium glucosinolates up from 5 to 24.5%. Dried crop residue, on average, reduced the disease incidence from 0-35%. Brassica line with high glucosinolates content increased bulb weight 23.3% in driied plant residue amendments over the control.The results indicate the importance of including Brassica crop seed meal, green manure and use of residue as cultural managment components in garlic white rot disease managment strategies.