Jujube rust prevention key
Jujube rust symptoms only harm the leaves. In the early stage, scattered light green dots appeared on the back of the leaves, and then they gradually became dark yellow, ie, the fungal spores. The shape of the summer spores is irregular and occurs mostly on the sides of the midrib, the tip of the leaf, and the base. The yellow surface spores were scattered after the lesion surface was broken. On the front of the leaf, there is a small green spot corresponding to the uredia spores heap, with irregular edges and leaf-shaped leaves. Finally, the leaves dry and fall early, which reduces the tree vigor and reduces the yield and quality.
Control measures 1. Strengthen cultivation management. Proper close planting, trimming dense branches, improving ventilation and light transmission conditions; strengthening fertilizer and water management, eliminating accumulated water, preventing orchard from being too humid, and reducing disease occurrence. 2. Spray protection. Spraying 1:2~3:300 Bordeaux mixture or Pomegranate 0.3% lime sulfur in the first half of July and then spraying it once a month can effectively control the occurrence of date rust.
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