Controlling Pythium damping-off in cucumber with manure.

• Autor(a) principal: BETTIOL, W.
• Data de Publicação: 1998
• Outros Autores: MIGHELI, Q., GARIBALDI, A.
• Tipo de documento: Capítulo de livro
• Idioma: eng
• Título da fonte: Repositório Institucional da EMBRAPA (Repository Open Access to Scientific Information from EMBRAPA - Alice)
• Texto Completo: http://www.alice.cnptia.embrapa.br/alice/handle/doc/13151
• topic: Controlling; Cucumber; Pythium

Different concentrations (0,10, 20, 30, 40 and 50% v/v) of manure (pH 7.90; P%=0.525; N%=1.44; C%=3.52; K%=1.57; Ca%=1.09; Mg%=3.2) were added to a substrate consisting of perlite:vermiculite:peat:sand (2:1:2:1), with or without 10 g of NPK fertiliser (12:12:12) in 500 ml pots. These pots were randomized distributed in a growth chamber with five replications for each manure and fertilizer concentration. The substrates were infested with 10 g/l of a Pythium inoculum (broken corn-sand medium) 15 days before sowing 10 cucumber seeds (cv. Mezzolungo-Marketer). The fresh weight, the percentage of emerged seedlings, and the severity of disease occurrence were determined 15 days after planting. After this first trial the container media from all replicates of the same treatment were mixed, transferred to five pots and replanted, in order to evaluate possible residual effects. A third trial was carried out by repeating this procedure. A positive correlation was found between the percentage of emergence and healthy seedlings and the concentration of manure added to the substrate, independently the presence of the fertiliser, for the three consecutive cucumber plantations. Disease severity and fresh weight of individual seedling were negatively correlated with manure concentration. The pH and EC(Electrical conductivity) of the media were positively correlationed with manure concentrations in the media added or not added fertilizer. Substrate amended with 30% or over this concentration of manure completely suppressed the disease. These results are as good as that with 10 and 5 g/l of media, with fertiliser and Pythium inoculum.