马铃薯黑痣病和疮痂病是影响马铃薯品相及产量的主要土传性病害。为有效防控该类病害，选取0.3%四霉素水剂、3%中生菌素可湿性粉剂等9种药剂进行马铃薯复合拌种试验。结果表明，4个复合拌种处理对马铃薯出苗和长势均具有一定的促进作用，对马铃薯黑痣病的防效为38.10%~69.66%，对马铃薯疮痂病的防效为32.06%~61.50%。各处理马铃薯增产14.52%~40.36%，均增产显著。其中每100 kg切块种薯用2.5%咯菌腈悬浮种衣剂10 mL+0.3%四霉素水剂15 mL +0.136%赤·吲乙·芸苔可湿性粉剂2 g复合拌种处理，对马铃薯黑痣病防效为69.66%，对疮痂病防效为61.50%，增产率为40.36%，均显著高于其他处理，适于生产上推广。

Potato black scurf disease and scab are the main soil-borne diseases which affect the quality and yield of potatoes. In order to strengthen the effective control of these diseases, in this study, 9 fungicides, such as 0.3%tetracycline and 3%zhongshengmycin WP, were selected to apply compound seed-dressing on potatoes. The results showed that the four seed-dressing treatments could promote the emergence and growth of potatoes and showed obvious control effects on potato black scurf disease and scab, among which the control effects on potato black scurf disease were 38.10% to 69.66% and the control effects on potato scab were 32.06% to 61.50%. Yields of potato among all treatments increased significantly with increasing rates varied between 14.52%to 40.36%. Among them, 'fludioxonil 2.5% FS 10 mL plus tetramycin 0.3% AS 15 mL plus GA·IAA·BR 0.136% WP 2 g' showed 69.66% control effect on potato black scurf disease, 61.50% control effect on potato scab and 40.36% increase in yield, which was significantly higher than that of other treatments and was considered suitable for production and popularization.

S435.32

国家自然科学基金(31560487)；甘肃省重点研发计划(18YF1NA095)；甘肃省科技计划项目( 20CX9NA091 )；甘肃省农业科学院科研条件建设及成果转化项目( 2019GAAS23 )。