Primary Study on the Attractiveness of Volatile Constituents of Fruit to Dacus dorsalis Hendel

• Main Authors: Ran-How Hwang, 黃任豪
• Other Authors: Yu-Chang Liu
• Format: Others
• Language: zh-TW
• Published: 1995
• Online Access: http://ndltd.ncl.edu.tw/handle/03424213173228354771

碩士 === 國立中興大學 === 昆蟲學系 === 83 === Twenty-one constituents of fruits from guava(Psidium guajava), go(Mangifera indica),citrus(Citrus grandis)and carambola(Averr hoa carambola)were selected and tested in the screen house toind out the most attractive compoumds for luring the oriental fruit fly, Dacus dorsalis Hendel. Methyl anthranilate(MA),α- terpineol(αT),ethyl acetate(EA),ethyl butyrate(EB)andinnamyl alcohol(CA)showed the most attractive to both female andale flies. By screening the various concentrations of molasses, it showed that 50%molasses was the best in attracting the flies. Tested on the five most effective constituents mentioned above mixed respectively with 50% molasses, it showed that the mixture of 50% molasses and ethyl butyrate(25:1)was the most attractive one which was 1.8times higher than the 50% molasses used aolne. Whwn two constituents mixed with each other, it showed that the mixtures of αT＋EA,EA＋EB,αT＋EB,EA＋CA and MA ＋EB attracted more adult flies than the other mixtures. Further test on these five mixtures mixed with 50% molasses, respectively, it showed the mixtrue of 50% molasses with ethyl acetate and ethyl buryrate was the best one, with 61.0% of attractiveness, which was 2 times higher than the 50% molasses used alone. The mixture of 50% mola- sses with ethyl aectate and cinnamyl alcohol was also highly eff- ective, with 49.3% of attractiveness.The effective duration of attractant MEAEB within 15 days period, showed the percentage of attraction to the flies over 60% during the first six days, and maintained 45%~55% till the 10th day. Compare with 50% molasses within 15 effective days duration, the attractiveness of MEAEB was apparently higher than those of 50% molasses, showed that when adding the volatile constituents of host fruit ethyl acetate and ethyl butyrate to the 50% molasses could increase the effec- iveness of food attractant 50% molasses to the oriental fruit fly at the first ten days.