Susceptibilidade de larvas de Cerotoma arcuata Olivier (Coleoptera: Chrysomelidae) a Beauveria bassiana (Bals) Vuillemin, Metarhizium anisopliae (Metsch). Sorokin e Bacillus thuringiensis Berliner / Susceptibility of Cerotoma arcuata Olivier (Coleoptera: Chrysomelidae) larvae to Beauveria bassiana (Bals.) Vuillemin, Metarhizium anisopliae (Metsch.) Sorokin and Bacillus thuringiensis Berliner

RESUMO

Larvas de 2° instar de Cerotoma arcuata foram avaliadas em relação à susceptibilidade aos fungos entomopatogênicos Beauveria bassiana, Metarhizium anisopliae e a bactéria Bacillus thuringiensis com as toxinas Cry3. Os insetos adultos foram mantidos em gaiolas e alimentados com plântulas de feijão (Phaseolus vulgaris L.) e as larvas em "gerbox" com cotilédones de plântulas de feijão recém-germinadas. Das oito estirpes de B. bassiana avaliadas, CG 156 e CG 213 causaram 100 por cento de mortalidade das larvas, as duas estirpes de M. anisopliae CG 210 e CG 321 foram patogênicas, eliminando 80 e 100 por cento das larvas de C. arcuata, e, das cinco estirpes de B. thuringiensis testadas, o isolado CG 940 causou 70 por cento de mortalidade das larvas.

ABSTRACT

Second instar larvae of Cerotoma arcuata were evaluated concerning the susceptibility to fungi Beauveria bassiana and Metarhizium anisopliae and Bacillus thuringiensis strains containing Cry3 toxin. Adults of C. arcuata were kept in large cages and fed on bean seedlings and the larvae were reared in ægearboxÆ feeding on germinated Phaseolus bean cotyledons. Strains CG 156 and CG 213 of B. bassiana killed 100 percent of the insect larvae and strains CG 210 and CG 321 of M. anisopliae killed 80 and 100 percent of the insect larvae. Strain CG 940 of B. thuringiensis killed 70 percent of the insect larvae.