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Spotted-wing drosophila,  Drosophila suzukii , and the anthracnose pathogen  Colletotrichum fioriniae  are an important insect pest and fungal disease of highbush blueberries, respectively, in the United States. However, whether  C. fioriniae  infection affects  D. suzukii  preference and performance remains unknown. Here, we conducted choice and no-choice studies to determine the repellent, oviposition-deterrent, and insecticidal effects of  C. fioriniae  on  D. suzukii . In choice tests, blueberry fruit treated with anthracnose solutions containing spores from either field-collected infected fruit (‘fruit’) or a laboratory  C. fioriniae  culture (‘colony’) were less attractive to sexually mature  D. suzukii  females, but not males, than untreated fruit. The plant tissue (fruit or leaves) did not influence  C. fioriniae  repellency effects on  D. suzukii . In no-choice tests, 55% fewer numbers of eggs were laid on, and 65% fewer adults emerged from, blueberry fruit treated with either the ‘fruit’ or ‘colony’ anthracnose solution than untreated fruit. Egg-to-adult  D. suzukii  survival was also 12% lower on  C. fioriniae -infected fruit. No repellency or negative effects on survival were observed when  C. fioriniae  spores were filtered out of the solution. These findings will help efforts towards the discovery of microbial-derived repellent/oviposition-deterrent compounds that could be used in behavior-based management strategies for  D. suzukii .

scientific reports

Repellent, oviposition-deterrent, and insecticidal activity of the fungal pathogen Colletotrichum fioriniae on Drosophila suzukii (Diptera: Drosophilidae) in highbush blueberries