Submitted to: Meeting Abstract
Publication Type: Abstract Only
Publication Acceptance Date: 9/26/2016
Publication Date: 10/16/2016
Citation: Epsky, N.D., Kendra, P.E. 2016. Aqueous Grape Juice Bait for Anastrepha suspensa (Loew), (Diptera: Tephritidae) and Zaprionus indianus Gupta (Diptera: Drosophilidae). Meeting Abstract. 9th Meeting of the Working Group on Fruit Flies of the Western Hemisphere. Buenos Aires Argentina, 16-22 October 2016
Technical Abstract: Field tests were conducted in Miami, Florida to evaluate attraction of Anastrepha suspensa (Loew), and Zaprionus indianus Gupta, to traps baited with aqueous grape juice solution (10%) with and without preservative. Microbial activity, which occurred in baits without preservative that were aged in the laboratory for 0-9 d prior to placement in the field, decreased capture of A. suspensa but increased capture of Z. indianus. Electroantennogram studies of A. suspensa females found increased antennal response to laboratory aged bait, indicating that chemicals produced by microbial growth were repellent to A. suspensa in the field. Subsequent field tests of grape juice bait without preservative found that baits that were aged 0 or 3 d captured more Z. indianus than baits that were 6 or 9 d old, all sampled after 3 d. However, response to solutions that were 0, 2, 4 or 6 d old and sampled after 2 d was much more variable. In tests run over 4 different weeks, the highest capture was in 6, 2 or 0 d old solutions (weeks 1-3) or there was no difference among treatments (week 4). In a final test, traps were sampled daily, captured insects removed, and bait recycled over a sequential 4 d sampling period. In the first day after deployment, the highest capture was in traps baited with 2 or 4 d old laboratory aged bait. For the remaining three days, the highest capture was in the 0 d bait, which was not aged in the laboratory prior to placement in the field. Variability in efficacy among baits could be due to microbial load at time of bait preparation (laboratory aged) or ambient temperature and/or decay of captured insects in baits without preservative (field aged).