What pests and diseases need to be controlled in mulberry trees in summer?
What pests and diseases need to be controlled in mulberry trees in summer? Please give guidance. In summer, mulberry trees have the following pests and diseases that need to be controlled: 1. Diseases. Mulberry red rust. The symptom is that after the young buds are damaged, they swell, become deformed and curved, and the surface is covered with small yellow slightly raised spots (aecium). When leaves are damaged, at first circular...
What pests and diseases need to be controlled in mulberry trees in summer? Please give guidance.
In summer, mulberry trees have the following pests and diseases that need to be controlled:
1. Diseases. Mulberry red rust. The symptom is that after the young buds are damaged, they swell, become deformed and curved, and the surface is covered with small yellow slightly raised spots (aecium). When leaves are damaged, at first circular, glossy, slightly raised, yellowish lesions are scattered on both the front and back sides, and later they gradually thicken and become orange-yellow spots. In the later stage of the disease, the epidermis of the lesions ruptures and releases orange-yellow powder (aeciospores), covering the entire leaf, and the leaves fall off easily. It is commonly known as iron rust disease. Control method: In late July and early August, spray with 80% zineb wettable powder at 250-300 times dilution, etc., applying once every 7-10 days, for 2-3 consecutive times.
Mulberry bacterial wilt. After the mulberry roots are damaged, the plant loses water, and the leaves wilt and droop, showing a green wilt appearance. In long-affected plants, the lateral main roots and lateral roots become wet-rotted, and some turn black and decay, and the whole plant dies. Control method: At present, there is no specific effective medicine for this disease. It is necessary to strengthen prevention as the main approach. According to the author's practical experience, 10 to 15 days after summer pruning of mulberry trees, use agricultural streptomycin, etc. for control.
Mulberry violet root rot. When the disease occurs, the root bark first turns yellow-brown and loses its luster, then gradually becomes dark brown, leaving only the detached cork layer and xylem. The surface of the damaged roots is entwined with silk-like purplish-red rhizomorphs and purplish medicinal-colored sclerotia. After the mulberry roots are damaged, the branches and leaves grow slowly, and finally the whole plant dies. Control method: For 667 sq m, mix 5 kg of 50% carbendazim with soil and apply it during intertillage.
2. Insect pests. From July to September, the more serious pests include mulberry thrips, mulberry whitefly, spider mites, mulberry geometrid, and mulberry pyralid, etc. Corresponding measures should be taken to control different pests.
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