Ametoctradin COMO OPÇÃO PARA O CONTROLE QUÍMICO DA REQUEIMA NA CULTURA DO TOMATEIRO PARA PROCESSAMENTO INDUSTRIAL

Abstract

Late blight is one of the most important and destructive diseases of tomatoes. The objective of this work was to evaluate ametoctradin, associated with methyran and dimethomorph, as an option for chemical control of tomato blight for industrial processing. The experiment was carried out at IF Goiano - Campus Morrinhos, where Heinz 9553 was grown. A randomized block design was used with four repetitions and 12 treatments: 1 - Control with water application; 2 - ametoctradin + methyran (2.5 L ha-1); 3 - ametoctradin + methyran (2.0 L ha-1); 4 - ametoctradin + methyran + mineral oil (2.5 L ha-1 + 0.5 L ha-1); 5 - ametoctradin + methyran + chlorothalonil (2.5 L ha-1 + 1.5 L ha-1); 6 - ametoctradin + methyran + mandipropamide (2.5 L ha-1 + 0.5 L ha-1); 7 - ametoctradin + dimethomorph (1.0 L ha-1); 8 - ametoctradin + dimethomorph (1.2 L ha-1); 9 - ametoctradin + dimethomorph + Mineral oil (1.0 L ha-1 + 0.5 L ha-1); 10 - dimetomorph + chlorothalonil (0.675 L ha-1 + 1.5 L ha-1); 11 - mandipropamide (0.5 L ha-1); 12 - chlorothalonil (1.5 L ha-1). The applications were performed with a costal sprayer under the pressure of 43.5113 psi in CO2 (400 L.ha-1). A microclimate was created to favor the natural occurrence of the disease. The variables evaluated were: leaf severity at 85, 92 and 99 days after transplanting, area below the disease progress curve, estimated yield per hectare (t ha-1) and total soluble solids (TSS). All treatments were superior to the control. The ametoctradin associated with methyran and dimethomorph was efficient in the control of late blight, being equal to the fungicides already registered for the crop. Treatment with amethoctradin + methyran + chlorothalonil provided higher productivity. Regarding TSS, there were no significant differences between treatments.