Chrysanthemum, commonly known as "Nine Flowers" or "Yellow Flowers," is a perennial herb belonging to the Asteraceae family. It has been cherished by the Chinese people for centuries and is one of the world's four major cut flowers. In addition to its ornamental value, chrysanthemum is also widely used in traditional Chinese medicine. The flower is valued for its detoxifying properties and its ability to dispel wind and clear heat. It is cultivated across various regions of China.
In August, proper care is essential for healthy growth. One important task is to prune the mother plant to encourage new shoots and better flowering. This helps maintain the plant's vitality and ensures a more abundant bloom later in the season.
Pest and weed management is also crucial during this time. Chrysanthemum is prone to several diseases, including Chrysanthemum blight caused by *Phytophthora* species. This disease thrives in warm and humid conditions, particularly in South China from May to October, and in the north from August to September.
To manage this disease, early intervention is key. When symptoms first appear, you can apply 30% basic copper sulfate at a dilution of 400 times, or a 1:1:100 Bordeaux mixture. Other effective options include 80% Capitacan WP diluted at 500 times, 50% thiophanate-methyl suspension at 800 times, 75% carbendazim WP at 600 times, and 50% benomyl WP at 1500 times. Additionally, applying a new high-fat film can help protect the plants. Treatments should be repeated every 10 to 15 days, with 3 to 5 applications depending on the severity of the infection.
Proper maintenance and timely treatment are essential for ensuring a healthy and vibrant chrysanthemum crop. (Source: China Plant Protection Network – Wei Linfei)
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