Utilização de diferentes iscas de feromônios de agregação, na captura de Metamasius hemipterus L., 1758 (COL.: Curculionidae) em cana-de-açúcar

Abstract

ABSTRACT

The cultivation of sugar cane is of great importance in the Brazilian economy, both for animal feed as animal fodder, and in the production os sugar, alcohol, and energy. However, it has been suffering losses with the incideence of the coleobroca Metamasius hemipterus L. 1758 (Col.: Curculionidae). The mass collection of the insect with the use of traps has been highlighted in recente years as an alternative formo f control, due to its simplicity, economy and a lower evironmental impact. The use of pheromones associated with food traps has proven to be efficient in capturing the pest insect. The objective of this study was to evaluate the release rate and the best bait of the aggregation pheromone with respect to capture efficiency M. hemipterus. To determine the daily release rate of pheromone Rincoforol and Metamasol in different releasers, the experiment was conducted in a greenhouse. There were six treatments were performed with seven repetitions. To evaluate the attractiveness of different types of pheromone baits in capturing adults, the study was conducted in sugarcane plantation, located in the Engineerring Campus of Agrarian Sciences CECA/UFAL in the municipality of Rio Largo, AL (latitude 09° 56'01" S, longitude 36° 33' 15" W). The experimental design was a latin square with six treatments and six repetitions, evaluated every 15 days for six months, totaling 12 collections. The following formulations were used: 2(E)-6-methyl-2,4-heptanol (Rincoforol) and the mixture of 4-methyl-5nonanol with 2-methyl-4-heptanol (Metamasol). In the greenhouse, the best average daily in plastic capsules containing a hole in the cap was Rincoforol with Chitosan was 1.53 ± 0.41 mL/day. In the fourth and fifth month it was observed that the treatment with Rincoforol + Chitosan in Glutaraldehyde 0.5% presents an average collection of insects of 51.0 ± 3.65 and 43.0 ± 2.49 respectively, where it was significantly different from the other treatments. The aggregation pheromone Rincoforol using Chitosan showed the lowest daily release rate. For the capture of M. hemipterus the one with the highest capture rate was the release agent with the mixture Rincoforol + Metamasol + Chitosan. Key words: Insecta, broca-do-olho-do-coqueiro, Chitosan.