杀菌剂对苹果树腐烂病的田间防效

为筛选苹果树腐烂病高效防治杀菌剂，采用病疤刮治、药剂刷干以及不同药剂交替刷干的方法，研究了6种杀菌剂对苹果树腐烂病的田间防治效果。结果显示，100万孢子/g寡雄腐霉菌可湿性粉剂500倍液的刮治效果最好，防效达89.58%，且促进病疤愈伤组织形成能力较强，愈合度达24.28%，显著优于其他杀菌剂。100万孢子/g寡雄腐霉菌可湿性粉剂500倍液与430 g/L戊唑醇悬浮剂300倍液交替刷干的效果明显优于单一药剂刷干，防治效果达93.06%，新生病疤减少率95.83%。寡雄腐霉菌与戊唑醇交替刷干可以显著降低新生病疤的发生数量，从而起到对苹果树腐烂病的预防作用，再结合病疤刮治措施，可有效促进腐烂病病疤愈合。

Field Efficiency Evaluation of Several Fungicides against Apple Tree Valsa Canker

This study aims to screen out fungicides with better control efficiency for the prevention and control of apple canker. The control efficiency of six chemical fungicides against apple Valsa canker was tested by scraping scars, smearing trunk and alternate smearing trunk with different fungicides. Results indicated that one million spores/g Pythium oligandrum wettable powder diluted 500 times had good control effect when applied by scraping scars which showed an average percentage of the control efficiency of 89.58%, it could effectively promote the healing of disease scar with a healing percentage of 24.28%, which was significantly superior compared with those in other fungicides. Alternate smearing using the combine of one million spores/g Pythium oligandrum wettable powder diluted 500 times plus 430 g/L tebuconazole diluted 300 times showed significantly good control effect compared with those funcides applied separately by scraping scars which showed an average percentage of the control efficiency of 93.06% and a reduction rate in new occurring lesions by 95.83%. In conclusion, alternate smearing using the combine of Pythium oligandrum wettable powder plus tebuconazole could significantly reduce the number of new occurring lesions, thus prevent apple tree Valsa canker effectively, yet combined with scraping scars, this could significantly improve the formation of callus tissue.