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The phytosanitary importance of the corn leafhopper,  Dalbulus maidis  (De Long and Wolcott) (Hemiptera: Cicadellidae) and the planthopper,  Delphacodes kuscheli  Fennah (Hemiptera: Delphacidae) lies in their ability to transmit phloem-associated plant pathogens, mainly viruses and mollicutes, and to cause considerable mechanical damage to corn plants during feeding and oviposition. Fungi, particularly some members of the Ascomycota, are likely candidates for biocontrol agents against these insect pests, but several studies revealed their failure to invade the insect cuticle possibly because of the presence of inhibitory compounds such as phenols, quinones, and lipids and also by the antibiosis effect of the microbiota living on the cuticular surface of the host. The present work aims to understand interactions between the entomopathogenic fungus  Beauveria bassiana  (Balsamao-Crivelli) Vuillemin (Hypocreales: Cordycipitaceae) and bacterial antagonists isolated from the cuticular surface of  D. maidis  and  D. kuscheli.  A total of 155 bacterial isolates were recovered from the insect's cuticle and tested against  B. bassiana.  Ninety-one out of 155 strains inhibited the growth of  B. bassiana.  Bacterial strains isolated from  D. maidis  were significantly more antagonistic against  B. bassiana  than those isolates from  D. kuscheli.  Among the most effective antagonistic strains, six isolates of  Bacillus thuringiensis  Berliner (Bacillales: Bacillaeae (after  B. subtilis )), one isolate of  B. mycoides  Flügge, eight isolates of  B. megaterium  de Bary, five isolates of  B.pumilus  Meyer and Gottheil, one isolate of  B. licheniformis  (Weigmann) Chester, and four isolates of  B. subtilis  (Ehrenberg) Cohn were identified.

journal of insect science

Growth Inhibition ofBeauveria bassianaby Bacteria Isolated from the Cuticular Surface of the Corn Leafhopper,Dalbulus maidisand the Planthopper,Delphacodes kuscheli,Two Important Vectors of Maize Pathogens