Prevalência da mosca-dos-estábulos, Stomoxys calcitrans (Diptera: muscidae), em diferentes subprodutos de usina sucroalcooleira

Abstract

A significant increase in the abundance of flies, particularly Stomoxys calcitrans and Musca domestica, has been observed in sugarcane production areas. The objective of this work was to evaluate the prevalence and development capacity of S. calcitrans in various sugar and alcohol byproducts, measuring the species richness and species composition of these substrates. The work was conducted from January to December 2011, using four byproducts: bagasse, mulch, filter cake and mulch plus vinasse. Each monthly, 20 emergency traps were distributed in each substrate and remained active for four weeks per month. The specimens were classified, labeled and identified at the Entomology Laboratory of UFGD. During the whole period a total of 43,903 flies were caught, distributed in 20 families and 37 species. Among muscids, S. calcitrans (n = 4,049) and M. domestica (n= 2,764) were the most abundant species. The four substrates studied showed significant differences in the abundance of S. calcitrans. Filter cake and vinasse were the substrates with the greatest mean abundance of stable fly. Although the filter cake presented a relatively higher capacity of producing flies, the more extensive area covered by mulch plus vinasse resulted in a potentially greater production of stable fly. In general, the high capacity of stable fly production in byproducts of the sugarcane mill helps to explain the recent population explosions of this species in the region.