INCIDÊNCIA DA Diatraea saccharalis NA TERCEIRA SAFRA DE CANA-DE-AÇÚCAR FERTILIZADA COM ORGANOMINERAL DE LODO DE ESGOTO E BIOESTIMULANTE

Abstract

It is extremely important to study fertilization with organomineral and plant stimulant sources for a good nutritional balance in sugarcane (Saccharum spp.) cultivation, facilitating pest management such as the sugarcane borer. The objective was to study the incidence of the sugarcane borer fertilized with mineral and organomineral fertilizer from sewage sludge and bio-stimulant. The experiment was carried out at Instituto Federal Goiano - Campus Morrinhos-GO, in dystrophic Red-Yellow Latosol. The experimental design used was randomized blocks in a factorial scheme of 2 X 5 + 1, with five doses with and without bio-stimulant plus an additional one (mineral fertilization) in four replications. The combinations of doses were based on the recommendation for planting fertilization (470 kg ha-1 of the formulation 04-21-07) and coverage (400 kg ha-1 of the formulation 07-00-28 + 0.7% B), consisting of 100% of the recommendation with the mineral source and 0, 60, 80, 100, and 120% of the recommendation with organomineral fertilizer (FOM) with and without bio-stimulant. Sampling of the sugarcane borer was carried out at the harvest of the sugarcane field. Sampling was done at 365 days after the last harvest (DAUC). Eight stalks were sampled per treatment, and a longitudinal cut was made in the center of the stalk. Healthy and injured internodes by the sugarcane borer were counted. The results were subjected to 5% variance analysis. The means of factors with and without bio-stimulant were compared by Tukey's test. Regression models were adjusted with 0.05 significance level. Increasing fertilization doses significantly influence the incidence of D. saccharalis at 365DAUC. The organomineral fertilizer source from sewage sludge does not differ from mineral fertilizer. The bio-stimulant does not interfere in the incidence of sugarcane borer.