Control of Botrytis cinerea in petals of Cymbidium

The orchid has the characteristics of large flowers, peculiar and colorful flowers, long flowering period, up to about 3 months, cultivation medium is not soil but bark, moss, etc., rarely occurs diseases and insect pests, and can keep the family hygienic and tidy. Therefore, it has become a popular Lunar New year potted flower in recent years.

The pathogen of Botrytis cinerea is Botrytiscinerea. The disease is caused by small round brown spots on petals and sepals, which is more common in Phalaenopsis, Cardelia and Oncidium, and is mainly caused by high humidity and poor ventilation. At low temperatures in winter and spring, in order to prevent cold air from invading the greenhouse and infringing orchids, doors and windows are often closed or heat preservation measures are taken, resulting in a high relative humidity of the air in the greenhouse (more than 90%), which is a good opportunity for the disease to occur and spread. The fungal disease is a widespread pathogen with hundreds of hosts and can infect flowers, ornamental plants, vegetables and fruit trees. It generally occurs in cultivated greenhouses from February to May every year. If the butterfly orchid flower is infected, it not only affects the ornamental value, but also reduces the commodity value, and even has no way to sell, resulting in great losses. The prevention and control methods are as follows:

(1) pay attention to ventilation and reduce environmental humidity.

(2) before the first flower unfolds, start spraying 2000 times of 50% acetaminophen wettable powder, and then spray it every 2-4 weeks.

(3) during flowering, the diseased flowers are immediately removed, burned or buried.

(4) other ornamental plants and flowers inside and outside the greenhouse should also be protected by spraying at the same time.