Pathogenic activity of Isaria spp. for control of Dactylopius opuntiae (Hemiptera: Dactylopiideae) and the effects of selected insecticides Dahkkit: Da Silva Lopes, Rosineide, Gonçalves De Oliveira, Luciana, De Lima, Geiziquele, Dos Santos Correia, Maria Tereza, Da Costa, Antonio Félix, De Luna-Alves Lima, Elza Áurea, De Menezes Lima, Vera Lúcia