MySheen

Common diseases of rhododendron

Published: 2024-11-22 Author: mysheen
Last Updated: 2024/11/22, 1. Leaf swelling disease. Before the disease, especially during the tapping and leaf spreading, Bordeaux solution of 1purl 200 can be sprayed, and the diseased leaves can be removed in time. Before germination, 0.3-0.5 Bordeaux solution or Bordeaux solution of 1 handkerb 200 can be sprayed 2-3 times, usually once every 7-10 days. After the disease, 65-80% mancozeb 500 times or 0.3-0.5 Baomesulphur mixture can be sprayed 3-4 times, once every 7-10 days. 2. Leaf spot and brown spot. Spray 7 from May to August

1. Leaf swelling disease. Before the disease, especially during the tapping and leaf spreading, Bordeaux solution of 1purl 200 can be sprayed, and the diseased leaves can be removed in time. Before germination, 0.3-0.5 Bordeaux solution or Bordeaux solution of 1 handkerb 200 can be sprayed 2-3 times, usually once every 7-10 days. After the disease, 65-80% mancozeb 500 times or 0.3-0.5 Baomesulphur mixture can be sprayed 3-4 times, once every 7-10 days.

2. Leaf spot and brown spot. Spraying 1000 times of thiophanate methyl, 4000 times of mancozeb and 4000 times of mancozeb from May to August can effectively control the development of the disease. In order to prevent leaf yellowing, ferrous sulfate can also be applied.

3. Coin disease: the top of the damaged twig leaves is covered with dense white or pink mite layer, and sometimes the leaves produce mite galls, which are mostly caused by the infection of leaves stung by aphids. Its control methods: while removing diseased leaves, spraying agents containing copper sulfate, spraying omethoate EC or putting carbofuran directly in the basin can control aphids and other prick pests.

 
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