Methods and Technical Key Points for Pest and Disease Control in Polygonatum (Solomon's Seal)
Diseases include black spot disease, in which irregular yellowish-brown spots appear on the leaves starting from the leaf tip, with a purplish-red edge at the boundary between the diseased and healthy tissue, after which the spots spread downward and the leaves turn withered and yellow. For control, spray with a 50% Tuzet (thiophanate) 1000-fold dilution, applying the spray once every 7-10 days for 2-3 consecutive applications.
Diseases include black spot disease, in which irregular yellowish-brown spots appear on the leaves starting from the leaf tip, with a purplish-red edge at the boundary between the diseased and healthy tissue, after which the spots spread downward and the leaves turn withered and yellow. For control, spray with a 50% Tuzet (thiophanate) 1000-fold dilution, applying the spray once every 7-10 days for 2-3 consecutive applications.