POTENCIAL DE PRODUTOS BIOLÓGICOS NO CONTROLE DE Meloidogyne incognita NA CULTURA DA BATATA

Abstract

Meloidogyne genus nematodes represent a major problem in world agriculture. The potato crop is the fourth most important in the world and has a high susceptibility to these nematodes that is known as root-knot nematodes. Due to the sustainable warning of a decrease in chemical control, there has been a satisfactory increase in biological products in the last decade. Thus, the present work aimed to determine the potential of biological products to control Meloidogyne incognita in potato. The experiment was carried out in a greenhouse, the potato tubers were grown in 18 L polyethylene pots filled with sand, ravine soil and substrate, both sieved and mixed in a 1:1:1 proportion and inoculated with 5000 eggs of M incognita. The experimental design was in randomized blocks consisting of six blocks with nine treatments: T1 - Water, T2 – Water + nematode, T3 - Paecilomyces lilacinus + Trichoderma harzianum + Moss, T4 - Serratia marcescens, T5 - Burkholderia cepacia, T6 - Bacillus sp., T7 – Serratia sp. and T8 - Bacillus subtilis + B. licheniformis and T9 - Fluensulfone. At 60 days after inoculation, the number of galls and eggs of M. incognita, tuber fresh mass and nutritional analysis were evaluated, and at the end of the potato cycle, at 100 days, potato yield was evaluated. Treatments with B. cepacia and Fluensulfone proved to be good reducers of M. incognita reproduction, with reductions of 86% and 94%, respectively. Regarding potato productivity, the treatment with B. cepacia was the most satisfactory, increasing by 10%, demonstrating high efficiency and potential to be used in the management of M. incognita in potato.