Extratos hidroalcoólicos de cavalinha no controle da mancha bacteriana em plantas de tomateiros

Abstract

Brazil is one of the world's largest tomato producers. Among the bacterial diseases that affect the tomato, it is worth mentioning the bacterial spot, caused by four species of Xanthomonas genus. As na alternative to the use of agrochemicals to control pathogens, plant extracts can be used, which have been used in agriculture to provide plant health. The objective of this work was to evaluate the effect of horsetail extracts (Equisetum hyemale L.) on the growth of Xanthomonas sp. in laboratory test and control of bacterial spot in tomato plants. To prepare the extract, 20 g of crushed in the blender were mixed with 100 mL of water and 100% absolute ethyl alcohol in the ratio 6: 4, obtaining a 20% horsetail extract, the solution was allowed to stand for 72 hours. The experimental design was in randomized blocks, with five treatments and six replicates. The treatments used in tomato plants were: control, 5% mackerel, 2% mackerel, 2% mackerel + milk (20mL) and 0.5% liquid potassium silicate. In the laboratory microbial test, 5x2 factorial was used, 5 autoclaved and non-autoclaved treatments, with 3 replicates per treatment. Based on the results, it was possible to conclude that: Hydroalcoholic extract of horsetail promotes a reduction in the incidence of bacterial spotting in tomato plants. Non-autoclaved mackerel extract decreases the growth of the bacterium Xanthomonas sp. in microbial test. The 0.5% potassium silicate decreased the incidence by Xanthomonas sp. in tomato plants.