|Chu, Chang Chi|
Submitted to: Caribbean Food Crops Society Proceedings
Publication Type: Proceedings
Publication Acceptance Date: 7/11/2005
Publication Date: 12/1/2005
Citation: Chu, C., Ciomperlik, M.A., Chang, N.T., Richards, M., Chen, T., Fitzgerald, G.J., Hefner, B.A., Alexander, P.J., Henneberry, T.J. 2005. Developing thrips traps for detecting scirtothrips dorsalis (hood). Caribbean Food Crops Society Proceedings 41(1): 156-160. Interpretive Summary: Thrips traps were developed upon the request of APHIS for detecting the invasive chili thrips, Scirtothrips dorsaalis (Hood). The tests conducted in Arizona on western flower thrips (WFT) showed that the inclusion of a small pieces of Vapona cube in CC traps increased the catches by 4.6 times compared with no Vapona inclusion. We also developed a Vapona dispenser with blue stripe modification that improved the catches over a regular dispenser by 1.4 times. Results of verification of the developed traps in Taiwan showed that the CC traps caught 0.07 chili thrips/trap/week comparing to 0.34 chili thrips/modified dispenser/week.
Technical Abstract: Studies were conducted to develop thrips traps for detecting and identifying Scirtothrips dorsaalis (Hood). Traps were developed in Arizona where Frankliniella occidentalis (Pergande) were established in the field and testing in southern Taiwan where S. dorsaalis were found. Addition of a one square centimeter of dichlorovos (Vapona) pest strip as a killing agent in CC traps increased the catches of western flower thrips compared with standard CC traps. The increased thrips catches are attributed to increased mortality and retention of thrips that entered the traps as opposed to increased attractiveness. Average CC trap catches in Taiwan was 0.07 S. dorsaalis per CC trap per week. USDA, APHIS guidelines suggest to survey one square mile area with 2,280 CC traps where one or more S. dorsaalis adults were found at the original infested sites. Thus, 160 S. dorsaalis would be caught per CC trap per week under conditions similar to that of southern Taiwan. Addition of ethylene glycol helps preserve the thrips for identification.