Symptoms: There are round or elliptical lesions on the leaves, and they vary in size from 2 to 10 mm in length. Light yellow to light brown. In some species, the spots are light brown with a clear reddish-purple edge, and the spots are quickly covered with a layer of gray mold under humid conditions. When the lesions are dry, they become thin, easily broken, transparent, and generally grayish white. When severe, the whole leaf will die. When the stem is infested, it rots and breaks from the infected area, and the bud turns brown and decays. When the spots are brown and wet, they quickly become sticky and covered with a gray moldy layer. When the young strains are infected, they usually die at the point of growth. However, plants can grow again in summer.
Pathogen: A direct strain of the pathogen Botrytis elliptica (Berkeley) Cooke, conidium oval, and sometimes Botrytis cinerea Pers. may also damage lily, but it mainly causes flower rot.
Infection route: The pathogens use hyphae or sclerotia to overwinter on the remaining diseased tissues, and contaminate infections occur in the following year. The infection can be repeated many times; the greenhouse is prone to onset when it is excessively humid. When the plant is too dense, the disease becomes severe, and the partial application of nitrogen fertilizer is heavy.
Control methods:
1, horticultural control of the autumn, planting in the upper parts of the ground to clear and destroy the disease; disease removal when diseased leaves, reduce the source of infection.
2, the greenhouse should be ventilated and sufficient light, watering should be carried out in the leaves on the easy drying time, it is best to water from the edge to avoid wetting the leaves.
3, chemical control can use 50% carbendazim or 70% carbendazim or 70% methylthiobacillus WP 500 times, if necessary, can choose 50% fast keratin or 50% acetaminophen and 50% agricultural Liling WP 1000 ~ 1500 times plus 80% carbendazim powder 600 times liquid effect is good. Spray 40-50 kg of liquid every 667 m2. Focus on spraying fresh leaves and the surrounding soil surface and spray 2 times in succession.
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