Efeito da canola sobre fitopatógenos de solo em feijoeiro

Abstract

Canola (Brassica napus L. var oleifera) is an oleaginous belonging to the Brassicaceae family and represents an option for crop rotation. The objective of this work was to evaluate the allelopathic effect of canola cultivation on common bean and fungi of the soil Fusarium and Rhizoctonia, using aqueous extract of leaves and roots. The fungus mycelial growth test was carried out in a culture medium containing aerial extract of the aerial part and the root portion of canola in the concentrations of 0, 1, 2.5 and 5%. These concentrations were used for the other tests. For the germination and vigor test of the bean seeds the seeds were soaked in the extracts for 10 minutes. The tipping test was carried out in gerbox with treatments as 0 and 5% concentrations of shoot extract and roots. For each gerbox was used 100 g of substrate and inoculated 10 g of the fungus, and after 24 hours the bean sowing. The experiment in greenhouse in the vessels had 6 treatments, to which Rhizoctonia and Fusarium fungi were introduced into the vessels. The data were submitted to analysis of variance and Tukey test at the significance level of 5%. Canola promoted an effect on the reduction of the mycelial growth of Rhizoctonia and Fusarium. For the germination of the seedlings the treatments did not obtain significant difference neither for the dry matter. And in the field there was difference in the treatment to which the cultivation of the Brassica napus canola was not cultivated.