6%抗坏血酸水剂对马铃薯增产及晚疫病的防治效果

Control Effect of 6% Ascorbic Acid WA Against Potato Late Bright in Guizhou

为研究6%抗坏血酸水剂对马铃薯晚疫病的防治效果和对马铃薯产量的影响,在贵阳和毕节马铃薯种植地,于马铃薯生长幼苗期、块茎形成期和块茎膨大期喷施不同浓度的6%抗坏血酸水剂。结果表明：6%抗坏血酸水剂1 000倍液的防治效果较好,施药后第14~21d时平均防治效果可达75.09%~80.74%,显著降低了马铃薯晚疫病的发生,同时能增加单位面积的块茎产量,平均增产21.59%。

Potato plants were sprayed with different concentration of 6% ascorbic acid at seedling stage,tuber formative stage and tuber expansion stage in potato fields of Guiyang and Bijie City to study control effects of 6% ascorbic acid against potato late blight and yield of potato.The results showed that the average control effect of 6% ascorbic acid WA 1 000 on potato late blight reaches 75.09%~80.74%14~21 d after spraying,which can reduce occurrence of potato late blight significantly and increase potato tuber yield per unit area with 21.59% averagely.