APLICACION DE ENMIENDAS ORGANICAS PARA EL MANEJO DE NACOBBUS ABERRANS EN TOMATE
Keywords: brassica oleracea cv. capitata, false root-knot nematode, management, plant-parasitic nematodes, ricinus communis
AbstractThe incorporation of cabbage residues (Brassica oleracea L. cv. capitata) and ricinus residues ( Ricinus communis L.) to soil was tested for the management N. aberrans under greenhouse conditions. The number of galls was reduced significatively ([alpha]= 0.01) by the incorporation of cabbage 10 days before planting tomato (Lycopersicon esculentum Mill.); however, some plants died and plant growth was reduced as a consequence of a phytotoxic effect. In contrast, when the amendments were incorporated at planting, root galling was reduced in 36% and 54%, and in 21% and 46% with cabbage and ricinus residues at a dose of 1% and 2%, respectively. The height of the plant, dry weight of shoot and root increased in 20% and 25%, 57% and 65%, and 34% and 36% with cabbage, and in 16% and 21%, 55% and 55%, and 8% and 7% with ricinus at 1% y 2%, respectively. In a field naturally infested with N. aberrans, the incorporation of cabbage residues at different planting dates and doses was tested. When a dose of cabbage of 5.20 kg/m2 was incorporated at planting tomato, the number of galls in roots was reduced in 72%, 53% and 29%, while the incorporation of 3.25 kg/m2 one week before planting tomato reduced root galling in 66%, 50%, and 24% at 20, 40 and 60 days after planting, respectively. The incorporation of 5.20 and 3.25 kg/m2 of cabbage close to the planting date increased root dry weight in 24% and 21%, and shoot dry weight increased in 41% and 32%, respectively. The total and commercial accumulated yield of tomato increased significantly ([alpha]= 0.01) in 62% and 61% with the incorporation of 5.20 kg/m2 of cabbage at planting, and in 51% and 53% with the incorporation of 3.25 kg/m2 of cabbage one week before planting, respectively, in comparison with the control without amendments.