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在适宜弯孢霉叶斑病发病的条件下,对草坪型高羊茅热浪、黄金岛两个品种的植株喷施外源诱导物水杨酸后接种新月弯孢菌,结果表明:喷施水杨酸可以降低两个品种的弯孢霉叶斑病的发生。在平板培养中,水杨酸对新月弯孢菌分生孢子的萌发率及菌丝的生长均无明显的抑制作用,因此认为水杨酸处理后所试品种病情指数的下降是由于水杨酸处理提高了植株的抗病性,即所试品种产生了诱导抗病性而引起的;0.01～0.1mM的水杨酸诱导处理诱抗效果达到50%以上,水杨酸诱导高羊茅抗弯孢霉叶斑病的最佳浓度为0.01mM,诱导效果可达到70%以上;黄金岛的诱导抗性要好于热浪,诱导最佳间隔期为3d,诱导抗性持久期可达到15d。
Under the condition of the suitable curvaceous leaf spot disease, Curvularia lunata were inoculated with the exogenous inducer Salicylic acid on the plants of the heat wave and gold island of turfgrasses, and the results showed that spraying Salicylic acid can reduce the occurrence of curly leaf spot in two varieties. Salicylic acid showed no significant inhibitory effect on the conidial germination rate and mycelial growth of Curvularia lunata in the plate culture. Therefore, the decline of the disease index of the tested varieties after salicylic acid treatment is due to the decrease of salicylic acid Acid treatment increased the disease resistance of plants, that is, the tested cultivars had induced disease resistance. The induction effect of salicylic acid with 0.01-0.1 mM was above 50%, salicylic acid induced tall fescue Curvularia leaf spot optimum concentration of 0.01mM, the induction effect can reach more than 70%; gold island induction resistance is better than the heat wave, induction of the best interval of 3d, induced resistance duration of up to 15d.