Symptoms: The main damage flowers, leaves and twigs. At the beginning of the petal, water-stained spots or petal apices appear, and the edges turn brown, rapidly spreading, wilting, rot, and finally browning the whole flower withering. Visible gray moldy under wet conditions, that is, conidial stems and conidia of pathogenic bacteria.

Characteristics of the disease: The disease is caused by fungi, the pathogen is Botrytis cinerea, and the sexual state is sclerotinia fuck liana. The pathogenic bacteria live overwhelmingly in the diseased body, and in the second year of spring, when the conditions are appropriate, they are transmitted through the airstream and invade the wound or weakened organs. The rainy season and flowering period in the Yangtze River valley from June to July are prone to disease.

Control methods:

(1) Horticultural control: remove diseased buds, flowers, branches; maintain good ventilation and light transmission conditions, control temperature and humidity; use drip-free membrane covering

(2) Chemical control: Prevent disease, spray 50% carbendazim WP 500 times or 75% chlorothalonil wettable powder 800 times. After the onset of the disease, 60% carbendazim hydrochloride water-soluble powder 600-1500 times, acrylic acid, carvacrol 500-800 times, 50% ethylene nucleus wettable powder or suspension 800-1000 times , 50% quick-inking WP 1000 to 2000 times, 50% nellikon wettable powder 1000 to 1300 times, 50% acetaminophen wettable powder 1000 times, 65% Wanlingling WP 1000 Diluent, 50% Duowei Wei WP 600 to 800 times, 50% Trimethasone WP 800 times, 28% Botrytis WP 1000 times, 40% Shijiale (Pyrimethanil) Suspension Agent 1200 times, 25% chlorpheniramine (ergosterol biosynthesis inhibitor) EC 2000 times. The above agents were sprayed once every 10 to 15 days, and they were continuously controlled for 2 to 3 times.

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