化学诱抗剂诱导金银花抗白粉病效果研究

用壳聚糖、草酸、水杨酸、葡聚糖、硅酸钠、硫酸亚铁、氟乐灵、磷酸氢二钾等8种药剂在不同株龄金银花上进行了对白粉病的诱导抗性试验。结果表明壳聚糖、草酸对金银花白粉病有良好的诱导抗性,在1年生、2年生和4年生金银花上对白粉病的平均防治效果分别达82.3%、59.9%和72.1%,54.9%、58.4%和74.1%。水杨酸、硅酸钠、硫酸亚铁有一定的诱导效果,但不稳定。葡聚糖和磷酸氢二钾无明显诱导抗病作用,氟乐灵则有促进发病的作用。

Effects of chemical inducer on the induced resistance to powdery mildew in honeysuckle (Lonicera japonica Tunb.)

The induced resistances of honeysuckle against powdery mildew were compared at different growth ages by using chitosan, oxalic acid, salicylic acid(SA), dextran, sodium silicate,ferrous sulfate(FeSO_4), trifluralin and potassium phosphate dibasic (K_2HPO_4 ). The results showed that the resistance induced by chitosan and oxalic acid was higher than that by other chemicals, with average control rates of 82.3% and 59.9%, 72.1% and 54.9%, 58.4% and 74.1% on one-year, two-year and four-year honeysuckles, respectively. The chemicals salicylic acid, dextran, sodium silicate and FeSO_4 had instable effects, while dextran and K_2HPO_4 had no induction effects. Trifluralin deteriorated the disease.