Análise do efeito da solução fermentada a base de carapaça de caranguejo na supressão da incidência da fusariose do quiabeiro em São Luis - MA

Abstract

Fusariosis is one of the main phytosanitary problems that plague okra production in Maranhão, as it is a difficult to control disease associated with high costs for the purchase of chemicals that are often unviable to smallholders who grow okra. as a source of income. The objective of this research is to analyze the effect of fermented crab carapace solution on the pathogen Fusarium oxysporum f.sp. vasinfectum in vitro and the suppressiveness of okra fusariume in seedlings of the variety “Valença” in São Luís / MA . The experiments were conducted at the CCA / UEMA Agronomic Biotechnology Center, at a Plant Pathology Laboratory and greenhouse. For laboratory evaluation, the growth of fungal colonies was measured in a completely randomized experimental design with five treatments and ten replications. For evaluation in a greenhouse, the crab carapace solution was mixed with autoclaved soil seven days after seed emergence. The pathogen inoculum at the concentration of 106 macroconidia mL-1, was added to the soil (30 mL.Kg-1) 21 days after germination of Valença okra plants with five treatments (0.10,20,40,80). mL.Kg-1 of soil) and 5 repetitions. Data from all assays were subjected to analysis of variance and means compared by Tukey test at 5% probability, data were run using the AgroEstat® statistical program. The results for the in vitro test met expectations as percentage of mycelial growth inhibition (PIC) by 100% at concentrations from 0.3 (v / v) and the in vivo test showed no significant variation. . The conclusion of the work allowed us to infer that the fermented solution may be an important tool in the control of F. oxysporum f.sp. vasinfectum, but needs further investigation for the development and standardization of an efficient methodology