Diseases and their control of Lilium

Penicillium spp.

symptom

During storage, white spots will develop on the rotting scales, and later, velvety green-blue patches will develop. The infected Lilium will further decay when kept at a low temperature of -2°C. Eventually the pathogen will invade the base of the bulb and will also slow down the growth of the plant. Although the bulb may look unhealthy, the growth of the plant will not be affected as long as the base is intact. After planting, the infection is neither transferred to the stem nor infects the plant from the soil.

Prevention and treatment methods

Do not plant bulbs whose base is damaged. Store the bulbs at the recommended minimum temperature. Diseased bulbs must be soaked in a 1/1000 fungicide aqueous solution for 30 minutes before planting. After planting, maintain a suitable soil temperature.

Phytophthora lilium

symptom

Plant foot rot will hinder the growth of the Lilium, and in severe cases will cause the Lilium to wilt. Soft rot develops at the infected area at the base of the stem, turning dark green to dark brown and spreading upward, and the leaves turn yellow and lose color at the base of the stem. Infections similar to soft rot also often occur on the above-ground stems, causing the stems to bend or wilting.

Prevention and treatment methods

Disinfect the soil with soil disinfectants; using fungicides that inhibit rot fungi during cultivation is also effective; ensure that the soil has good drainage conditions; prevent crops from remaining in a wet state after watering: keep the soil temperature as low as possible in summer.

Lilium buds fall and shrink

symptom

When the flower buds grow to 1~2 cm, they will fall off. The buds turn light green in color, the pedicels attached to the stem shorten, and the buds fall off. In spring, the lower buds are affected first, while in autumn, the higher buds fall off first.

Prevention and treatment methods

Do not plant varieties that are prone to bud drop in areas with insufficient light. The bulbs must not dry out during cultivation to prevent the buds from shrinking. Make sure the bulbs have a good root system and provide the best possible environment, paying special attention to light and transpiration.