The reduction effect of two fungicide of application methods on the control of apple scab
To elucidate the application strategies of fungicides in mitigating and managing apple scab,difenoconazole·pyraclostrobin 30％SC was employed as the reference agent in a series of field experiments.Two distinct application methodologies were implemented:prolonging the spraying interval and deferring the initiation of the first spraying event.The empirical findings spanning from 2020 to 2022 revealed that extending the spraying interval to 15 d,20 d,and 25 d yielded control effects on apple scab within the ranges of 70.73％～83.51％,73.02％～89.10％,and 67.35％～91.48％,respectively.Likewise,delaying the initial spraying event until after 80％of apple blossom,15 d after 80％of apple blossom,and 30 d after 80％of apple blossom exhibited control effects of 71.89％～82.06％,66.08％～88.87％,and 62.84％～89.55％,respectively.Consequently,while ensuring a conspicuous control effect on apple scab,the spraying interval can be extended to 20 d,or the commencement of the first spraying event can be deferred to 15 d after 80％of apple blossom.These two application approaches result in a reduction of spraying frequency by 4 times and 2 times,respectively,manifesting a noteworthy reduction in fungicide dosage and an outstanding control effect.
apple scabdifenoconazole·pyraclostrobin 30％SCspraying interval periodfirst spraying period
万方数据
维普
