FORMULAÇÕES BIOLÓGICAS COMO OPÇÕES DE MANEJO DE PATÓGENOS DE SOLO EM BATATA INGLESA

Abstract

The objective was to evaluate the incorporation of four biological formulations, in isolation, together with chemicals and chemicals in isolation , in the management of soil pathogens in potato crops. We evaluated five treatments: T1- water, T2- Ao, Am, Mr, Pl and Bs, Bl + Th, Tv, Tspp. 0.5 kg of each product/ha 0.5kg, T3- Th, Tv, Tspp., Bs, Pl, Cr 0,5 kg of each product/ha + Bs and Pl 0.5 L product / ha 0.5kg T4 Th, Tv, Tspp., Bs, Pl, Cr 0,5 kg of each product/ha + Bs and Pl 0 , 5L product/ha pyraclostrobin + metiram and 3.0 Kg of product/ha, T5- metiram and pyraclostrobin and 3.0 Kg of product/ha + cadusafos 4,4' product/ha + boscalida 0.5 kg product/ha, with five repetitions. Treatments were applied at planting and ridging held at 20 DAP, with costal pressurized spray to CO2. At first, the treatments would be evaluated for the incidence of Rhizoctonia sheath blight (Rhizoctonia solani), but during the experiment was not observed incidence of soil pathogen. After observed high incidence of blackleg, there was the quantification of the incidence of the disease and quantification of emerged plants, carried out at 35 DAP. We evaluated the incidence percentage of tubers with symptoms of soft rot, nematodes and scabies, and randomly selected 25 tubers of each treatment and evaluated the method notes. For emergency assessments and blackleg, only emergency variable statistically differed between treatments, especially T4 and T5, with largest number of emerged plants. For reviews of symptoms of soft rot and attack by nematodes and scabies, only tubers with nematodes attack symptoms differed between treatments, noting that the application associated with organic chemicals or applied in isolation, proved effective in nematode control in the potato.