Early blight: (1) 75% chlorothalonil 500 times spray; (2) 70% mancozeb 500 times spray. Late blight: (1) 5 days in advance with 1:2:200 Bordeaux mixture; (2) Prevention with 1:4:300-400 copper ammonium complex. (Northeast Agricultural University, College of Horticulture Yu Xihong)
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