不同施药方式对马铃薯疮痂病防治效果的影响OA

Currently,the prevention and control of potato common scab disease mainly rely on chemical bactericide or biological control agents,applied via methods such as seed dressing,root drenching,and furrow application,which often fail to achieve optimal results.This experiment primarily aimed at improving application methods and improving the efficacy of chemical bactericide and biological control agents against potato common scab.Under an integrated water and fertilizer management system,a 20%zinc thiazole suspension(chemical bactericide)and Bacillus subtilis+Trichoderma harzianum(composite biological control agent)were selected,and different combinations of seed dressing and drip irrigation root drenching were implemented.The control effects were evaluated by measuring incidence rates,disease indices,and tuber yield.The 20%zinc thiazole suspension(80 g/667m2)seed dressing combined with root drenching at the budding using a 500-fold dilution(0.72 L per plant)(Treatment A2)showed good control efficacy.The optimal control effect was achieved by the composite biocontrol agent consisting of Bacillus subtilis and Trichoderma harzianum,applied at a rate of 1 000 g/667m2 for seed dressing,and by drenching with 500 times liquid once each at the bud stage and peak flowering stage(0.72 L per plant)(Treatment B3),reaching 72.55%,with a disease index as low as 7.42.The yield increase across treatments was relatively modest,with the highest increase being 6.42%(Treatment B3).Therefore,the application of zinc thiazole bactericide via"seed dressing+single drip irrigation root drenching"and the composite biological control agent through"seed dressing+two drip irrigation root drenchings at the bud stage and peak flowering stage"could effectively prevent and control potato common scab disease.