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Lily Disease Prevention
Lily thrives in a cool and humid climate, and it should be grown in well-drained, slightly acidic, fertile, and humus-rich soils. The planting area must have good drainage to prevent waterlogging. During summer, lilies prefer partial shade and are not heat-tolerant. It is also important to avoid continuous cropping to maintain soil health.
**1. Bulb and Scale Rot Disease**
This disease causes slow plant growth and yellowish-green leaves. The underground stems develop brown or dark brown spots that spread inward, leading to rot and eventual plant death. On the bulbs, dark brown spots appear on the edges of the scales, and the bulb tissue begins to decay. To control this, soak the bulbs in a mixture of 600 times diluted prohexine and 300 times diluted seedling green for about 3 minutes. For bulbs that have already sprouted, reduce the soaking time slightly. A few days before planting, loosen the soil and mix carbendazim (in a 1:2 ratio) into the ground to prevent infection.
**2. Blight**
In the early stages, light brown spots may appear on bulbs, leaves, young stems, and shoots. This can hinder plant growth, cause delayed sprouting, and damage young leaves. In severe cases, growth becomes stunted, and flowering is poor. Prevention includes disinfecting seeds and soil, and applying fungicides as soon as symptoms appear.
**3. Leaf Burn or Drying**
Initially, young leaves curl slightly inward, followed by yellow-green to white spots a few days later. As the condition worsens, these spots turn brown, and the leaves may bend or fall off. To manage this, choose disease-resistant varieties with healthy bulbs. Ensure the soil is moist before planting, and maintain proper planting depth. Keep relative humidity stable and lower temperatures during early growth to prevent excessive growth.
**4. Bud and Flower Bud Blight**
When flower buds reach 1–2 cm in size, they turn pale green, and the junction between the stem and stalk tightens, causing the buds to drop. To prevent this, select light-insensitive varieties and use artificial lighting from 50% emergence. Provide 16 hours of daily light, using 20 watts per square meter until the buds grow. Continue this lighting for 6–7 weeks until natural daylight reaches 16 hours, then stop the supplemental light.