几种短链脂肪醇对白星花金龟的引诱活性研究

分别吸附收集白星花金龟Potosia brevitarsis Lewis成虫取食桃果实过程及桃果实单独存在环境中的挥发性物质, 经GC-MS分析发现,成虫取食桃果实环境中含有桃果实中检测不到的信号化合物乙醇。在田间初步评价了乙醇及其8种类似物甲醇、正丙醇、异丙醇、正丁醇、异丁醇、叔丁醇、正戊醇、正己醇对白星花金龟成虫的引诱活性。结果表明:甲醇、乙醇、正丙醇及异丙醇等对试虫均有一定的引诱作用,其中乙醇及异丙醇的引诱活性最高;乙醇10倍稀释液的引诱活性与未经稀释的乙醇相当,100倍稀释液的引诱活性明显降低;异丙醇的引诱活性随着供试浓度的降低而降低;乙醇与异丙醇以等体积混合时的引诱活性较佳,其3种比例混合物的引诱活性均随着使用浓度的降低而降低。

Attraction of Short Chain Alcohols to Scarab Beetle, Potosia brevitarsis

The semichemical ethanol of Potosia brevitarsis Lewis from the volatiles which was collected from air passed over peach fruits infested by the beetles was identified using GC-MS. The attraction of ethanol and its 8 analogous——methanol, n-propanol, i-propanol, n-butanol, i-butanol, t-butanol, n-pentanol and n-hexanol were determined in the field. The results showed that methanol, ethanol, n- and i- propanol had attractive activity to the scarab beetle, in which the activity of ethanol and i-propanol were much higher. The attraction of ethanol was as the same as its 10 times dilution, but the activity of propanol was decreased as its diluting time increased. In the blends of ethanol and i-propanol, the ratio with highest activity was 1∶ 1(V/V). And the attractive activity of all the blends became lower as the concentration decreased.