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Symptom Identification and Control Methods for Leaf Spot Disease in Polygonatum
Polygonatum, also known as tiger ginger and chicken-head ginseng. It is the dried rhizome of Polygonatum kingianum, Polygonatum sibiricum, or Polygonatum cyrtonema of the Liliaceae family. Based on differences in the original plants and medicinal material characteristics, Polygonatum can be divided into three types: ginger-shaped Polygonatum, chicken-head Polygonatum, and large Polygonatum. The original plant of ginger-shaped Polygonatum is Polygonatum cyrtonema
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Symptoms and Control Methods of Polygonatum Leaf Spot Disease
The disease begins in April to May. On affected leaves, elliptical or irregular lesions first appear at the leaf tip, with brownish outer edges and pale white centers; the disease spreads downward from the lesions, causing the leaves to wither and die. The disease is more severe during the rainy season. Control methods: 1) After harvest, clean the field and garden, gather the dead branches and diseased plant debris and burn them to eliminate the overwintering pathogen. 2) Before the disease occurs and in the early stages, spray 1:1:100 Bordeaux mixture, or 50% Tuzet (thiram) 1000x solution, once every 7 to 10 days, for 3 to 4 consecutive sprays.
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