2,4-D防治马铃薯疮痂病的效果

Control Efficacy of 2,4-D Solution on Potato Tuber Common Scab

以不同浓度的2,4-D溶液处理马铃薯块茎并对植株进行喷施,分析2,4-D对马铃薯疮痂病的防治效果。结果表明,块茎喷施6.25 mg/L的2,4-D并以6.25 mg/L浓度在出苗后10 d喷施植株,块茎喷施100.00 mg/L的2,4-D而植株不喷药,2个处理的产量高、病害轻。2个处理分别较对照增产65.0%和67.6%;病薯率分别较对照降低17.2%和16.0%。块茎处理浓度大于25.00 mg/L时出苗率明显降低,植株处理浓度大于25.00 mg/L时药害明显增强。

Various levels of 2,4-D solution were sprayed on potato seedpiece and plant and the control efficacy on potato tuber common scab was studied. The treatment of spraying seedpiece before sowing and plants 10 days after emergence with 6.25 mg/L 2,4-D, and the treatment of spraying seedpiece with 100.00 mg/L 2,4-D before sowing only had the highest yields and the lightest disease incidence among all the treatments. The yields of the two treatments were increased by 65.0%and 67.6%, respectively, but diseased tuber percentages were decreased by 17.2% and 16.0%, respectively, compared with the control. Plant emergence was decreased obviously when 2,4-D concentration spraying on seedpiece was above 25.00 mg/L.Plant phytotoxicity symptom was much obvious when 2,4-D concentration spraying on plant was above 25.00 mg/L.