生物制剂防治水稻稻瘟病效果评价

Evaluation for the Control Effect of Biological Agents on Rice Blast Caused by Pyricularia oryzae

摘要: 为科学合理地选择和使用田间控制稻瘟病的生物农药，通过于水稻破口前3天和齐穗期二次大田施药，研究了氨基寡糖素、春雷霉素和春雷霉素∙三环唑复配剂对稻瘟病的控病效果。结果表明2%春雷霉素水剂二次用药的病指防治效果分别为86.51%和83.53%，比化学农药三环唑(防效均大于90%)防治效果低。25%春雷霉素•三环唑悬浮剂50毫升/667 m²的剂量处理病指二次防效为90.48%和88.17%，25%春雷霉素•三环唑悬浮剂55~60毫升/667 m²的剂量处理病指防治效果均大于90%，增产效果大于5%，与化学农药三环唑的防效无显著差异。5%氨基寡糖素水剂对稻瘟病有一定的防治效果，随着剂量的增加，防治效果上升，5%氨基寡糖素水剂75~100毫升/667 m²的剂量处理病指防治效果均大于70%，增产效果大于5%，与化学农药三环唑的防效存在极显著差异(p < 0.01)，但增产效果无显著差异。

Abstract: In order to screen and use the biological agents for controlling rice blast scientifically in the field, the control effect of Amino oligosaccharides, kasugamycin and kasugamycin∙Tricyclazole was evaluated for panicle blast in field by spraying at three days before the rice break and full heading stage. The results showed that the control effect of kasugamycin 2% water on rice blast reached 86.51% and 83.53%, respectively 10 and 25 days after the second application; the control effect of Tricy-clazole 75% wettable powder was 90.48% and 88.17% respectively, while the control effect of ka-sugamycin∙Tricyclazole 25% suspension on rice blast was more than 90%, which could increase with the increase of its dosage. The two biological agents had better control effect on rice blast, and provided a reference for green control.