测定了茶皂素对雷公藤乳油防治茶尺蠖幼虫的增效作用。结果表明,用1、2、4 mg/ml茶皂素浸叶处理,对茶尺蠖2龄幼虫的毒杀作用不明显,第7天的毒杀效果只有27.03%~37.84%。用雷公藤乳油0.8、1.6、3.2、6.4 mg/ml和12.8 mg/ml浸叶处理,对茶尺蠖2龄幼虫的毒杀效果在第7天分别为27.27%、33.78%、40.54%、56.76%和63.51%。在0.8 mg/ml浓度的雷公藤乳油中加入4 mg/ml的茶皂素,对茶尺蠖幼虫的毒杀作用（84.42%）显著高于加1 mg/ml茶皂素的毒杀效果（68.83%）;而加入2 mg/ml和4 mg/ml的防效差异不显著。向不同浓度的雷公藤乳油中加入2 mg/ml茶皂素,对茶尺蠖2龄幼虫的共毒系数在第1、3、5、7天分别为667.68、981.61、1706.15和1209.76,即增效5.68~11.10倍,达到相同的使用效果可减少雷公藤用量85%以上。对茶尺蠖4龄幼虫增效1.00~6.91倍,减少雷公藤用量50%以上。
The synergism of tea saponin on Tirpterygium wilfordii EC against larvae of geometrid Ectropis obliqua Prout was determined. The results indicated that the toxicity of tea saponin to the 2nd instar larvae of E. oblique was not obvious. When treated with leaves that had dipped in tea saponin solution at the concentration of 1,2,4 mg/ml respectively, the corrected mortality was only 27.03% ~ 37.84% on the 7th day after treatment. Toxicity test for T. wilfordii EC against the 2nd larvae of E. obliqua was studied at the concentration of 0.8, 1.6, 3.2, 6.4 and 12.8 mg/ml respectively. On the 7th day after treatment, the corrected mortality was 27.27%, 33.78%, 40.54%, 56.76% and 63.51% respectively. There were significant synergistic actions on T. wilfordii EC with tea saponin against larvae of E. obliqua. Tea saponin at concentration of 4 mg/ml was added to T. wilfordii EC of 0.8 mg/ml,the corrected mortality of larvae of E. obliqua was significantly increased compared with tea saponin added at the concentration of 1 mg/ml, while no significant differences were found between tea saponin added at the concentration of 2 mg/ml and 4 mg/ml. Treated with T. wilfordii EC mixed with tea saponin of 2 mg/ml, the co-toxicity coefficients for the 2nd instar larvae of E. oblique on 1st, 3rd, 5th, 7th day after treatment, were 667.68, 981.61, 1 706.15 and 1 209.76 respectively. It means that the toxicities increased 5.68~11.10 times, and the amount of T. wilfordii EC decreased over 85% to reach the same effectiveness. The toxicities increased 1.00~6.91 times for the 4th instar larvae of E. obliqua, and the amount of T. wilfordii EC decreased over 50%.
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