MySheen

Control techniques of Leaf Blight of Rhododendron

Published: 2024-11-05 Author: mysheen
Last Updated: 2024/11/05, First, the main symptoms: occur in the leaves, mostly in the tip of the leaves. In the initial stage, the disease spot is faded green macula, the disease spot spreads inward from the edge, showing an irregular shape; in the later stage, the disease spot is yellowish brown, and when the disease leaf is serious, the disease leaf is dry. Second, the cause of the disease: fungal diseases. The pathogen lives on the plant disease residue and spreads through watering, insects and human activities. It can occur all the year round in the indoor environment. High temperature, dryness and poor ventilation are easy to cause diseases. Plant growth is weak or affected by insect pests (especially aphids, shell insects, whitefly)

First, the main symptoms: occur in the leaves, mostly in the tip of the leaves. In the initial stage, the disease spot is faded green macula, the disease spot spreads inward from the edge, showing an irregular shape; in the later stage, the disease spot is yellowish brown, and when the disease leaf is serious, the disease leaf is dry.

Second, the cause of the disease: fungal diseases. The pathogen lives on the plant disease residue and spreads through watering, insects and human activities. It can occur all the year round in the indoor environment. High temperature, dryness and poor ventilation are easy to cause diseases. The disease is serious after plant growth is weak or suffered by insect pests (especially aphids, shell insects, whitefly).

Third, prevention and control methods: ⑴ timely removal of sick and residual fallen leaves, should not be stored in the basin, should be concentrated burned. ⑵ strengthens maintenance and often sprays water on the leaf surface or surrounding space to improve the small environment. Increase the application of phosphorus and potassium fertilizer to enhance plant growth potential. In the early stage of ⑶, carbendazim or topiramate was sprayed. If there are pests, you can spray 1000-1500 times the liquid of nicotine to control.

 
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