Trichoderma spp. no controle de Sclerotium rolfsii agente causal do tombamento na cultura do pepineiro

Abstract

Cucumber (Cucumis sativus L.) is a crop susceptible to various diseases, among them, the plants of tipping caused by Sclerotium rolfsii that affects most crops in its initial stand of development, causing great loss of productivity. Forms of control of S. rolfsii must occur through the integrated management, using practices with chemical control, biological or physical. This study aimed to evaluate the effect of Trichoderma spp. Sclerotium rolfsii in the control culture on cucumber as well as its potential as a growth promoter in this culture. The experimental design was completely randomized in a factorial organized 4 x 2, with four replications. The factor a compound of four soil treatments: T1) soil without inoculation of Trichoderma spp, T2) soil inoculated with Trichoderma spp, T3) soil without inoculation of Trichoderma spp. + Rice husk, T4) soil inoculated with Trichoderma spp. + Rice husk. Factor two being the presence (dose of 8 g of rice colonized) or absence of the pathogen S. rolfsii. The parameters evaluated were: emergency, tipping seedlings, shoot growth and root dry weight of shoot and root at 15 days after sowing (DAS). The pathogen S. rolfsii interfere with the emergency, causing tipping seedlings, in addition to interfering in the shoot and root length and dry weight of shoots and cucumber root. The fungus Trichoderma spp. is inefficient as a biological control agent for S. rolfsii in the production of cucumber seedlings, according to the methodology used in this experiment. The fungus Trichoderma spp. acted as a growth promoter in length shoot of cucumber.