What is the cause of botrytis cinerea?

Gray mold is a common disease of poinsettia, which harms many kinds of herbs and woody flowers, whether cutting or potted. The diseases in Shanghai, Nanjing, Changsha, Nanchang, Guangzhou and other places are serious, which often cause the inflorescence, twigs and leaves to brown and rot, which affects the appreciation.

Botrytis cinerea harms inflorescences, flowers and shoots. After inflorescence infection, brown spots appeared on flowers and receptacle at first, and then quickly turned brown, withered and rotted. Diseases can spread down the flower stalk, harm the flower branches, and make the buds at the top of plants turn yellow-brown and die. Gray-brown mold grows in the affected area, which is an important feature of gray mold. Peony, zinnia, etc. A kind of coal mold is produced on the leaves and branches, which makes the leaves black and the seedlings grow poorly from a distance.

Botrytis cinerea is infected by a fungus.

The occurrence law of Poinsettia gray mold is the most serious in cold and humid weather. In greenhouse and family farming, it is easy to get sick when the temperature is low and humid. Especially the double-flowered variety is seriously ill. For the flowers and trees cultivated in the northern open field, such as Ligustrum lucidum, ginger and peony, the rainy, high temperature and high humidity seasons in summer and autumn are the most serious. Most of them are caused by botrytis cinerea infected by aphids.

Preventive and control measures:

(1) Strengthen cultivation management and raise indoor temperature. Pay attention to ventilation and light transmission to reduce humidity. Once potted poinsettia occurs in families or hotels, the infected plants should be immediately moved to a ventilated and light-transmitting environment and placed in the sun, which can achieve better control effect. Or removing lower leaves, burning, and ventilating and drying.

(2) For the prevention and control of serious diseases in flower beds or greenhouses, 1% Bordeaux solution, 65% zineb 800 times solution or 0.3 ~ 0.5 degree sulfur mixture can be sprayed at the early stage of disease occurrence.

(3) Control aphids in time to improve the resistance of seedlings.