.

• Autor(a) principal: Ferraz Filho, Almir
• Data de Publicação: 2002
• Outros Autores: Amaral, Maria Eugênia Carvalho, Fernandes, Wedson Desidério
• Tipo de documento: Artigo
• Idioma: por
• Título da fonte: Biotemas (Online)
• Texto Completo: https://periodicos.ufsc.br/index.php/biotemas/article/view/21627

The population density and mortality biotic factors of Alabama argillacea were studied in two cotton agroecosystems, with and without chemical control, in Dourados, Central-Western region of Brazil. The survey of cotton leafworm in the areas was similar, and shows no significant differences among them. The NUclear Poliedrosis Virus (NPV) and the fungus Nomuraea rileyi were the main mortality biotic factors of cotton leafworm. The linear regression analysis for the mortality proportion caused by NPV, in relation to the cotton leafworm average per plant in both areas, indicated that mortality caused by viroses is larva density dependent. Beyond entomopathogenic organisms, the mortality caused by parasitoids and predators was also observed. The Trichogramma spp. parasitoid induces 65,2% of egg parasitoidism in the area without chemical control and 55,2% in the controlled area. The proportion of parasitized eggs was not statistically different bteween the areas (Mann-Whitney = 0,8336 and p>0,05).