氟唑活化酯诱导黄瓜抗猝倒病及其对黄瓜苗期生理指标的影响

Resistance induced by fluoro-substituted benzothiadiazole derivatives against cucumber damp-off and its effects on the physiological index of cucumber seedlings

采用室内盆栽法,测定了5%氟唑活化酯(2,2,2-三氟乙基苯并[1,2,3]噻二唑-7-甲酸酯,FBT)乳油对黄瓜猝倒病的诱导抗病作用,同时测定了其分别以喷雾和灌根处理对黄瓜苗期生理指标的影响。结果表明:氟唑活化酯以有效成分25 mg/L,间隔期7 d喷雾施药3次,对黄瓜猝倒病的防效可达77.28%。氟唑活化酯以有效成分15、25和50 mg/L的剂量喷雾或灌根处理,对黄瓜苗期的株高、节间距、鲜重和干重均有不同程度的抑制作用;以有效成分15、25 mg/L的剂量喷雾或灌根处理,对黄瓜苗期茎粗和根冠比有促进作用,但50 mg/L的剂量处理则对茎粗和根冠比表现出抑制作用。试验表明,氟唑活化酯对黄瓜猝倒病有较好的诱导抗病作用,并对黄瓜苗期的生理指标有一定影响。

The resistance induced by fluoro-substituted benzothiadiazole derivatives（1,2,3-benzothiadiazole-7-carboxylic acid-2,2,2-trifluoroethyl ester, FBT） spray against cucumber damp-off was determined by houseplants method. The effects of FBT on the physiological index through spray and pouring root on cucumber seedlings were determined. The results showed that the control effect of FBT against damp-off disease in cucumber reached 77.28% when the effective components was 25 mg/L,and it was sprayed 3 times at 7-day intervals. The results of the experiments revealed that by treating with FBT at different concentrations（15, 25 and 50 mg/L） using to spray and pouring root method, the inhibition effect on plant height, jointing length, fresh weight and dry weight various. when the effective components was 15 or 25 mg/L, the stem diameter and the root-shoot ratio during the seedling stage were promoted. However, when the concentration was 50 mg/L, the corresponding stem diameter and the root-shoot ratio were inhibited. This study demonstrated that FBT is effective for the cucumber damp-off disease, and has influence on the physiological index of cucumber in the seedling stage.