What are the control methods for Cymbidium mosaic virus in Phalaenopsis?

Symptoms: At first, pale yellow discontinuous streaks form along the leaf veins, often appearing mosaic-like. Then part of the mesophyll cells in the diseased spots necrose, forming sunken brown necrotic spots.

PathogenOrchidleaf virus (CyMV) and ColMV, among several viruses. The main route of transmission is sap transmission.

Control methods: 1. The greenhouse should be reasonably ventilated to avoid high temperature and high humidity; pay attention to drainage and appropriately increase the application of phosphorus and potassium fertilizers; promptly remove diseased leaves, diseased fruits and residual plants. 2. Spray promptly in the early stage of disease onset. Commonly used agents include: 50% thiophanate-methyl wettable powder 500-fold solution, or 80% Daconil wettable powder 500-fold solution, or 75% chlorothalonil wettable powder 600-fold solution, 50% carbendazim-thiram 400-fold solution, or 1:1:200 Bordeaux mixture. Spray once every 7~10 days, for a total of 2~3 times.