Canna Rust, also known as rust disease, is a prevalent issue in southern Chinese cities. This fungal infection affects the leaves, causing them to turn brown and eventually dry out. The root cause is a rust fungus that thrives on the plant, leading to dark brown spots and even black cracks on the affected areas. As the infection progresses, the leaves curl and wither, making the condition worse. To manage this disease, it's crucial to maintain good garden hygiene by promptly removing infected leaves and reducing the spread of spores. A 0.2–0.3% Bordeaux mixture can be applied every 10–15 days to help control the damage effectively.
Phlox White Spot, or spot blotch, is another common leaf disease affecting Phlox plants. It typically starts from the lower leaves and spreads upward, causing them to die prematurely. The disease is caused by fungi from the genus *Septoria*, which overwinter on fallen leaves. Removing and destroying infected foliage in autumn helps reduce the source of infection. During the active season, spraying with 75% chlorothalonil wettable powder diluted at 800–1000 times can help prevent further spread.
Chrysanthemum Red Spotted Erythropolis is a serious disease that impacts flowers like Hippeastrum and Baidulian. It mainly affects leaves and pedicels, causing ulcers, small spots, and deformation. Infected pedicels may bend or dry out, preventing flowering. To prevent this, disease-free bulbs should be used for propagation, and proper air circulation should be maintained. Spraying with 75% chlorothalonil at 700 times dilution during an outbreak is effective in controlling the disease.
Narcissus Big Brown Spot, also called Fire Spot, is a global disease that causes burnt-looking lesions on narcissus leaves. Affected plants become stunted and weak. The disease also affects other ornamental plants like Zhuding red and Clivia. Prompt removal of infected leaves and soaking bulbs in 50% Benzoate solution for 15–30 minutes can significantly reduce the risk. This method has shown effectiveness in controlling the disease with up to 75.8% success rate.
Appendix Rust is a widespread fungal disease affecting various plants. Infected leaves develop yellowish patches that later turn rusty. Early yellowing and plant death are common symptoms. To manage it, remove diseased leaves, rotate planting areas, and apply phosphorus and potassium fertilizers to boost resistance. Recommended treatments include 25% triadimefon WP (1500–2000x), 20% Versalcin EC (400–600x), and 80% dexamethasone WP (500–700x).
Tulip Broken Color is a viral disease that causes mottled patterns on tulip leaves and leads to stunted growth. It is transmitted through aphids and contaminated juice. Controlling aphids using insecticides and removing infected plants promptly is essential. Avoid planting tulips near lilies to prevent cross-infection.
Cyclamen Gray Mold is a serious greenhouse disease that affects all parts of the plant, including leaves, petioles, pedicels, and petals. Infections lead to rotting and eventual plant death. Prevention includes avoiding wounds, removing infected parts, and applying fungicides such as 70% thiophanate-methyl WP (800–1000x) or 50% carbendazim (500–800x).
Camellia Leaf Spot is common in southern China, particularly in the Yangtze River region. It damages leaves and young stems, reducing photosynthesis and ornamental value. Lesions appear as gray or yellow-brown spots, turning dark brown over time. The disease is caused by *Cephalosporium* fungi. Proper fertilization, pruning, and spraying with 0.6–0.7% Bordeaux mixture can help manage it effectively.
Narcissus Yellow Stripe, caused by the Narcissus Yellow Streak Virus, is a widespread viral disease. It results in mosaic patterns, discoloration, and yellow streaks along veins. Some cultivars show stunted growth and distorted flowers. Aphid control is key, using 50% alfalfa fog at 4000x to reduce virus transmission. Removing infected plants and selecting healthy seedlings for propagation helps prevent the spread.
Peony Ringworm is a traditional Chinese flower disease caused by the Tobacco Rattle Virus. Symptoms include yellow-green rings or mosaics on leaves, stunted growth, and deformed foliage. The virus spreads through sap, pollen, and soil nematodes. Controlling nematodes with Yishubao or Kelvin and removing infected plants immediately is crucial for prevention.
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