Eficiência de Bacillus thuringiensis e larvicidas no controle de Stomoxys calcitrans (Linnaeus, 1758) (Diptera: Muscidae)

Abstract

Stomoxys calcitrans (stable fly) is a blood-sucking insect and can transmit various pathogens to attacked animals. Among the offer of substrates used in the oviposition of the fly, the remains of the sugarcane culture, filter cake and the land with application of vinasse stand out. Manure, soil with urine and organic material in stables, as well as cattle breeders at livestock production sites. Among the available control measures, we can highlight: the cultural method (reduction of the favorable environment for oviposition), physical (burning), biological and chemical control. Thus, evaluating the efficiency of the insecticides diflubenzuron, pyriproxyfene and the bacterium Bacillus thuringiensis in the control of S. calcitrans is important, as these products have a larvicidal action, which is essential for the prevention of outbreaks due to the lesser possibility of emergence of adults. For this, we conducted a randomized block experiment (DBC) with 10 treatments and five repetitions. Each experimental unit was represented by an emergency trap (1 m2 of base), where inside each one 50 previously identified fly larvae were stored, totaling 250 larvae per treatment. The treatments were represented by the control (untreated), Dimilin® (Diflubenzuron), Tiger EC® (Pyriproxyfeno) and Vectobac® (Bacillus thuringiensis var israelensis) in the dosages of 50, 100 and 150 g hectare-1 , respectively. In general, the products tested were effective in controlling larvae of S. calcitrans. However, it is worth mentioning that the best result (cost/benefit) was obtained with the product Dimilin® at a dosage of 150 g per hectare.