不同诱抗剂对烟草赤星病的诱导抗病作用

Induced Resistance Effect of Different Inducer against Tobacco Brown Spot Disease

[目的]筛选出一种能够有效诱导烟草提高对赤星病抗性的诱抗剂,为生产中烟草赤星病的防控提供参考。[方法]采用田间小区试验,比较了水杨酸、茉莉酸甲酯、苯并噻二唑、二氯异烟酸、甲壳素、草酸6种诱抗剂对烟草赤星病的诱导抗病作用。[结果]同一诱抗剂的不同浓度对烟草赤星病的诱导抗病效果不同,其中水杨酸以浓度为2.50 mmol/L时防治效果最好,在烟草赤星病发生高峰期的相对防效达56.6%,茉莉酸甲酯以浓度为1.00 mmol/L时防治效果最好,赤星病发生高峰期的相对防效达57.6%,苯并噻二唑以浓度为0.50 mmol/L时防治效果最好,高峰期的相对防效为62.2%,二氯异烟酸以处理的最高浓度为2.00 mmol/L时防治效果最好,赤星病发生高峰期的相对防效为47.8%,甲壳素同样以处理的最高浓度为2.00 mmol/L时相对防效最好,高峰期的相对防效为50.3%,草酸以浓度为15.00 mmol/L处理的防治效果最好,高峰期的相对防效为46.4%。不同诱抗剂在各自的最佳处理浓度下对烟草赤星病的防治效果不同,其中以苯并噻二唑的防治效果最好,烟草赤星病发生高峰期和后期的相对防效分别达62.2%和57.6%,茉莉酸甲酯次之,高峰期和后期的相对防效分别为57.6%和50.1%,二氯异烟酸、甲壳素和草酸在赤星病发生高峰期和后期的相对防效均较低。显著性分析表明,苯并噻二唑处理的相对防效显著高于其他5种诱抗剂。[结论]苯并噻二唑对烟草赤星病具有良好的诱导抗病效果。

[ Objective ] The aim was to screen out an inducer for tobacco against tobacco brown spot disease to provide reterence for controlling the disease. [ Method] Induced disease effects of six kinds inducer like salicylic acid, jasmonic acid methyl ester, benzene and showed two az- ole, dichloro isonicotinic acid, chitin and oxalic acid against tobacco brown spot disease were compared by using field plot test. [ Result] The same induced resistance agent at different concentrations had different brown spot disease resistance induced effects, among them the salicylic acid at 2.50 mmol/L had the best prevention and cure effect, and the relative control effect in the brown spot happened the peak reached 56.6% ; methyl jasmonic acid at 1.00 mmol/L had the best control effect, and the relative control effect in brown spot happen peak was 57.6% ; benzene and showed two azole at 0.50 mmol/L had the best control effect, and the peak relative control effect was 62.2% ; dichloro isonicotinie acid at 2.00 mmol/L had the best control effect, and the spot happen peak relative control effect was 47.8% ; chitin at 2.00 mmol/L had the best relative control effect, and the peak relative control effect was 50.3% ; oxalic acid at 15.00 mmol/L had the best control effect, and the peak relative control effect was 46.4%. Different induced resistance agents at their best treatment concentration of tobacco red star disease pre- vention and cure effect were different, in the 6 kinds of induced resistance agent, benzene and showed two azole had the best prevention and cure effect, and the relative control effects in brown spot happen peak and later period were 62.2% and 57.6% ; the control effect of methyl jasmonic acid was the second smallest, and the relative control effects in brown spot happen peak and later period and were 57.6% and 50. 1% respective- ly ; two chlorine isonicotinic acid, chitin and oxalic acid in spot happen peak and later period had lower relative control effect. Significant analy- sis showed that, the relative control effect of benzene and showed two azole was significantly higher than the other five kinds of induced resistance agent. [ Conclusion] Benzene and showed two azole had good induced resistant effect.