MySheen

Control of spot disease of Dendrobium

Published: 2024-11-05 Author: mysheen
Last Updated: 2024/11/05, Symptoms: lobar disease. Primary brown spots, small spots enlarged, central necrotic, grayish brown, 5-10 mm in diameter. There are small black spots on the surface of the old disease spot. The injured leaves turn yellow and fall, but there are differences among varieties. Nobile tends to have heavier fallen leaves, and its growth and development is significantly poor. SelenophomadendrobiiAbiko, the pathogen of Dendrobium. It belongs to straight bacteria and half-known fungi. Conidia colorless, unicellular, crescent-shaped, 5-8-8-1-2 micro.

Symptoms: lobar disease. Primary brown spots, small spots enlarged, central necrotic, grayish brown, 5-10 mm in diameter. There are small black spots on the surface of the old disease spot. The injured leaves turn yellow and fall, but there are differences among varieties. Nobile tends to have heavier fallen leaves, and its growth and development is significantly poor. SelenophomadendrobiiAbiko, the pathogen of Dendrobium. It belongs to straight bacteria and half-known fungi. The conidia are colorless, unicellular, crescent-shaped, with a size of 5 μ m, 8 μ m and 1 μ m. The hyphae are brown and septate. The growth and development temperature is 5: 30 ℃, and the suitable temperature for growth and development is about 25 ℃.

Route of transmission: the conidia are mainly transmitted through the air. There are more children from autumn to spring, and the disease usually occurs in the middle and lower leaves.

Prevention and control methods: 1. Pick the diseased leaves in time and deal with them. 2. Spray 75% chlorothalonil wettable powder at the initial stage of the disease, or 50% propofol wettable powder 1500 times, 40% carbendazim wettable powder 400x, or 70% ethyl phosphine manganese zinc wettable powder 500x, or 50% thiophanate methyl wettable powder 500x, once every 10 days, spray 2 times continuously for 3 times.

 
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