Thailand: Watch out for purple onion disease

Published 2021년 2월 11일

Tridge summary

The Department of Agriculture has issued a warning to farmers about the risk of purple leaf spot disease affecting onions, shallots, split onions, and garlic due to cool nights and foggy mornings followed by strong sunshine. The disease is identified by small, juicy water-filled spots on leaves that turn white and extend, causing tissue collapse and purple discoloration with white or yellow-orange stripes. In humid conditions, the disease spreads through black fungal spores. The disease can cause plant shabbiness and yield loss, and in severe cases, fungi can destroy the head, causing tuber rot. To prevent the disease, farmers are advised to improve soil conditions, use disease-free tubers, and treat tubers or seedlings with fungicides before planting. If the disease is already present, farmers are recommended to switch to other crops, regularly inspect and clean the area, and spray with fungicides as necessary, alternating between different fungicides to prevent drug resistance.

Disclaimer:The above summary was generated by Tridge's proprietary AI model for informational purposes.

Original content

During this period, the weather is cool at night and fog in the morning. During the day, the sun is strong. Department of Agriculture Suggested growers of onions, shallots, split onions and garlic to watch for purple leaf spot disease. That can be found at all stages of plant growth Initial symptoms will find a small wound, juicy water. Round or dashed shape on the leaf If the wound is dry, it will turn into a white wound spot. Later the wound was extended along the length of the leaf. Oval Tissue collapse The wound is dark purple or purple-brown The middle of the wound is slightly pale. There are white or yellow-orange stripes around the wound. In the case of humid weather, it is found on the wound containing black spores of the fungus causing disease. When multiple blisters are extended to each other, the leaves will dry out and the plant is shabby and the yield decreases if the disease is severe. The leaves will dry and die. Render If the disease causes fungi to destroy the ...

Source: Naewna