Pathology and damage: The disease is mainly harmful to flowers, causing wet rot, reducing the value of goods and ornamental value. At the beginning of the disease, watery white or brown spots on the petals are produced, which spread rapidly under humid conditions, making the whole flower brown and rot, with gray mold on it. The senescent leaves in the lower part of the plant cluster are affected, and the leaf margin or the tip of the leaf is covered with water-stained brown plaque, which spreads rapidly to the leaf surface, causing the whole leaf to be yellow.
Pathogen: The disease is a fungal disease caused by Botrytis cinerea Pers. et Fr. Characteristics of the disease: The bacteria are overwintering or summering on the sick body or other hosts; they are spread by wind and rain, water droplets and the like. Rainy, high humidity (more than 95%), suitable temperature (13 ~ 21 ° C), penetrating basin or plant clusters, residual flowers and leaves are more conducive to disease occurrence. Control methods: 1. Cultivation techniques: prevent the diseased parts from being removed in time, put them into plastic bags after cutting, and pick up the leaves with gray mildew layers before picking them up; remove the flowers and aging leaves in time to reduce the pathogens The opportunity to breed. 2, chemical control: tissue culture seedlings immediately after transplanting 60% anti-mildew 2 water-soluble powder 700 ~ 800 times liquid. In the cultivation, observe the temperature and humidity at room temperature, combined with the weather forecast to prevent the spraying before spraying, spray 50% of the WP 1500 times solution or high-fat film; the flowering period is best not to spray, control with temperature and humidity. After flowering, the following agents can be used alternately for prevention and treatment. Therapeutic agents: 50% procymidone, 16% iprodione, prochloraz, Kaiser; protective agents: 甲基托布津, iprodione, Cobo.
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