Biological control of phytonematodes of the genus <i>Pratylenchus through</i> natural inoculant in sugarcane

Abstract

This work had the objective to verify the efficiency of a natural inoculant composed by Paecilomyces lilacinus (Nemout®), separately or mixed with  pesticides used on sugarcane crops, and of a nematicide carbofuran on the control of Pratylenchus spp. The experiment was lead in greenhouse  conditions, in a completely randomized design, with 5 treatments and 7 replications, totalizing 35 plants, inoculated two months after the plantation of the stalks. One week after the inoculation, the following treatments were applied: 1. Nemout^® (5 kg p.c.ha^-1),
2. Carbofuran (7 L c. p.ha^-1), 3. Fipronil + Nemout^® (250 g/5 kg c.p.ha^-1), 4. Thiamethoxam + Nemout^® (600 g 5 kg c.p.ha^-1) and 5. Control. The  experiment was harvested 60 days after. The nematicide and Nemout^® treatments reduced the population density of nematode, statistically differing from the others, with Reproduction Factors lower than 1. The Nemout^® presented good potential for Pratylenchus spp. control on sugarcane in greenhouse separately, not demonstrating efficiency when mixed with pesticides commonly used in the Northeastern region of Brazil.