2,2,2-三氟乙基苯并[1,2,3]噻二唑-7-甲酸酯对黄瓜霜霉病的诱导抗病性

Resistance of cucumber to downy mildew induced by novel elicitor candidate,TBTC(1,2,3-benzothiadiazole-7-carboxylic acid,2,2,2-trifluoroethyl ester)

为明确2,2,2-三氟乙基苯并[1,2,3]噻二唑-7-甲酸酯(简称TBTC)对蔬菜病害的诱导抗病效果,以黄瓜霜霉病P seudoperonospora cubensis为研究对象,进行了该化合物在盆栽及田间小区条件下的诱导抗病试验。结果表明:TBTC对黄瓜霜霉病具有较好的诱抗活性,其中,盆栽试验中250mg/L处理的平均防效为77.50%±1.79%,对照诱导抗病剂苯并噻二唑(BTH)的平均防效是71.72%±2.58%,对照杀菌剂50%烯酰吗啉可湿性粉剂在有效成分500mg/L处理下的平均防效为71.46%±3.01%;两年的田间试验结果显示,TBTC250mg/L的处理对黄瓜霜霉病的最高防效达83.94%±2.09%,而BTH的最高防效为72.39%±2.91%,50%烯酰吗啉可湿性粉剂250mg/L的最高防效是89.08%±1.95%,表明TBTC对田间黄瓜的霜霉病可产生诱导抗病效果。

The protective effect of novel elicitor candidate,1,2,3-benzothiadiazole-7-carboxylic acid,2,2,2-trifluoroethyl ester（TBTC） was studied by surface spraying on the cucumber（Cucumis sativus L.） leaves to induce the resistance against the biotrophic downy mildew Pseudoperonospora cubensis in pot and field experiments.The results of pot experiment showed that the control afficacy of TBTC was 77.50%±1.79% at concentration of 250 mg（a.i.）/L,the control afficacy of positive control BTH was 71.72%±2.58% at the same condition,while that of dimethomorph 500 WP was only 71.46%±3.01% at concentration of 500 mg（a.i.）/L.Based on the results of two-year field investigations,the control afficacy varied at an acceptable range for TBTC,BTH and dimethomorph 500 WP.The highest control afficacy of TBTC at 250 mg（a.i.）/L,BTH at 250 mg（a.i.）/L and dimethomorph 500 WP at 500 mg a.i./L were 83.94%±2.09%,72.39%±2.91% and 89.08%±1.95%,respectively.The results suggested that TBTC could induce resistance of cucumber against P.cubensis.