Fontes de fosfito e acibenzolar-s-metil no controle de doenças e produtividade do tomateiro

Abstract

With the objective of evaluate the effect of the phosphite on the disease control and yield of tomato crop two trials were condueted al Unilever Bestfood experimental area in Goiânia-GO and at a commercial field in Hidrolândia-GO. In the first trial using the hybrid of industrial tomato H-9992, the statistical design was randomized blocks with 13 trataments and four replications. The treatments were: 1-MaxFitus 40; 2-MaxFitus 30; 3-potassium 20; 4- Phosphorus-K; 5-Kemifos; 6-Foskalium; 7-Nutriphite; 8-Nutril; 9-Hortiphus; 10-Kendal; 11-BioPower; 12 - Bion and 13- control. In the second trial using the hybrid Stylus, the treatments number 3, 4, 5, 7, 9, 12 and 13 were tested ogain and also the product Phytus K. The statistical design was randomized blocks with 8 trataments and 3 replications. Bolh trials were weekly sprayed wilh the products (treatments) in addition to the other pestcides regularly used. In the first trial we evalvated the severity of Xanthomonas campestris pv. Vesicatoria, the yield and level of soluble solids. In the second trial the incidence of Erwinia spp., severity of Phytophthora infestans and number of truits per plant were evalvated. The different phosphite formulations neither increased the yield in both trials nor the level of soluble solids in the second trial. There was a tendency of reduction of the severity of the X. campestris pv. Vesicatoria in the trial I with the use of phosphite. The incidence of Erwinia sp. Was reduced in the trial II and the efficiency of products went up 89%. The products used in the trial II did not reduce the severity of P. infestans, which increased during the evalvation period.