Antifeedant activity of terpene compounds against larvae of the diamondback moth, Plutella xylostella
Author of the article:HAN Zhao- Jiu1** , WANG Zong-De2, JIANG Zhi- Kuan1 , JIN Xian-Yang3 , QIAN Wan-Hong1 , CHEN Chao1 ,
Author's Workplace：1 Military Medical Institute of Nanj ing Command, Nanjing 210002, China; 2 Jiangxi Agricultural University , Nanchang 330045, China; 3 Research Centre for Pest Control Engineering and Technique of Jiangsu Province , Changzhou 213000, China
Key Words：terpene compounds, antifeedant rate, Plutella xylostella
Abstract：The antifeedant activities of twenty six terpene compounds synthesized from turpentine were tested with 4th instar larvae of diamond back moth, Plutella xylostella ( L. ) , using dipped cabbage discs. Six of these compounds, numbered 2, 4, 8, 13, 27 and 31, namely nopol, nopyl propyl ether, endo- isocamphanyl methanol propionate, 4- (1-methyl ethylene )-1-cyclohexenyl-1-ethol propionate, hydroxycitronellal propionate and hydroxycitronellal 1, 2- propanediol acetal, showed rather high antifeedant activity, and compound 2, 4 and 8 displayed the highest. Compounds 2, 4 and 8 held 98.33%, 99.80% and 100.00% antifeedant rate respectively 24 hours later, and 92.67%, 89.97% and 98.73% 72 hours later when the leaf discs were treated at the dosage of 001 gmL. While the dosage was 0.001 gmL, the antifeedant rates were 85.60%, 83.90% and 66.97% 24 hours later, and 63.20%, 63.30% and 45.93% 72 hours later respectively. The results also showed that the antifeedant activity went high with the dosage increase, down with the time going.