Chrysanthemum pest and disease control methods are essential for healthy plant growth. One of the most common issues is gray mold, which can be managed by applying fungicides such as chlorhexidine diluted to 1500 times, mancozeb at 500 times, sylphyrin at 150 times, or chlorothalonil at 600 times. It's recommended to apply these treatments 2-3 times with a 7-10 day interval, and rotating between different fungicides can help prevent resistance.
Chalk disease often affects the roots of chrysanthemums. To prevent this, it's important to use high-quality growing media that is free from contaminants. Before planting, you can disinfect the soil by exposing it to sunlight or mixing in sterilizing agents. During the growing phase, you can treat the roots with a 500x solution of dichlozoline or an 800x solution of pentachloronitrobenzene. Two applications spaced about 10 days apart usually provide effective control.
Stem rot typically appears in seedlings, causing the base of the stem to rot. The best prevention is timely transplanting of healthy seedlings. If stem rot occurs, you can treat it using a 600x solution of anti-virus cockroach or DuPont gram, both of which have shown good results in controlling the disease.
Common pests include aphids and spider mites. For aphid control, you can spray a 1500x solution of insecticide or a 3000x solution of avermectin. For spider mites, the same avermectin solution works well. Applying these treatments twice, with a 7-10 day gap between each, is usually sufficient to manage infestations effectively.
Proper care, regular monitoring, and timely intervention are key to keeping your chrysanthemums healthy and thriving. Always follow the manufacturer’s instructions when using any chemical treatment to ensure safety and effectiveness.
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