Grape juice bait for Zaprionus indianus (Diptera: Drosophilidae)

Volatile chemicals produced by actively fermenting aqueous grape juice bait have been found to be highly attractive to Zaprionus indianus in field tests conducted in south Florida.  This is a highly dynamic system, and studies were conducted to determine the effect of factors including time period of fermentation, laboratory versus field fermentation, insect load and sampling period on bait fermentation and effectiveness for attraction of drosophilids.