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What are the control methods for magnolia black spot?

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(1) Strengthen nursery management, boost tree vigor, and improve disease resistance. Choose loose, fertile soil with good drainage, apply fully decomposed cake fertilizer, loosen the soil and water in time, and in the north pay attention to preventing frost damage. (2) Promptly clear fallen leaves from the ground, prune severely diseased leaves from the trees, and bury them deeply in a centralized manner. (3) In the early stage of the disease, spray 1:1:160 Bordeaux mixture or 0.3-0.5Be lime sulfur mixture, 77% Kocide wettable powder, 30% copper oxychloride suspension concentrate, 25% copper-ammonia complex aqueous solution, 50% Tuzet wettable powder 6

(1) Strengthen nursery management, boost tree vigor, and improve disease resistance. Choose loose, fertile soil with good drainage, apply fully decomposed cake fertilizer, loosen the soil and water in time, and in the north pay attention to preventing frost damage.

(2) Promptly clear fallen leaves from the ground, prune severely diseased leaves from the trees, and bury them deeply in a centralized manner.

(3) In the early stage of the disease, spray 1:1:160 Bordeaux mixture or 0.3-0.5Be lime sulfur mixture, 77% Kocide wettable powder, 30% copper oxychloride suspension concentrate, 25% copper-ammonia complex aqueous solution, 50% Tuzet wettable powder 600-800 times dilution, 75% chlorothalonil wettable powder 800 times dilution, 70% thiophanate-methyl wettable powder 1000 times dilution, etc., spraying once every 10-15 days, for 2-3 consecutive sprays.

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