Symptoms and control of Botrytis cinerea in Phalaenopsis

Orchid gray mold, also known as orchid rot, may break out in our north and south flower beds, mainly harming orchid plants, among which the damage to horticultural treasures such as Phalaenopsis, Cymbidium and Cymbidium is more serious, seriously affecting the ornamental value of this kind of flowers. the following is an introduction to the symptoms and control of Botrytis cinerea in Phalaenopsis.

Botrytis cinerea of Phalaenopsis mainly harms flower organs, sepals, petals, pedicels, and sometimes leaves and stems. In serious cases, it will cause disease spots on flowers and gray mold everywhere, and Phalaenopsis is an ornamental orchid, which is undoubtedly a devastating disaster.

First, disease identification

When Phalaenopsis is infected with Botrytis cinerea, the leaves will appear brown disease mass, which will be unevenly distributed on the back of the leaves, which will affect the photosynthesis of the leaves and make the orchids grow poorly in the petals and calyx and infect the pathogens. At the initial stage, there are water-immersed and translucent spots on the petals and calyx, and then the disease spots turn brown and gradually expand into round patches, and the disease spots merge with each other. After the disease, the whole flower turned dark brown, the edge was pink, rotted and withered. The pedicel was harmed by germs and appeared watery spots in the early stage, and then gradually developed into a dark brown oval spot. About a week later, the orchids that were soaked in the early stage of flower death, the flowers will wither early, the buds will wither, and the orchids that bloom in the early stage are most vulnerable to Botrytis cinerea.

Second, the law of the disease.

The residual remains of the flowerpot contain a large number of pathogens. Under suitable temperature and humidity conditions, the spores will germinate again and become the second source of infection. When the disease occurs, a large number of conidia will be transmitted again by air flow, Rain Water, irrigation or manual touch. When orchids are planted in the greenhouse in winter and spring, the temperature and humidity will be in line with the occurrence of the disease. And the temperature is about 18 to 25 degrees, and the relative humidity is about 90%. It can easily cause gray mold.

III. Prevention and control methods

1. Selection of cultivation substrate

Phalaenopsis is attached to the root, for the fleshy gas to take root. Therefore, the selection of matrix requires ventilation and fat preservation. The commonly used substrates are aquatic plants, coconut bran, pine bark and so on. The base fertilizer uses rotten farm manure, which can be slowly absorbed by the root. Liquid fertilizer is often used, diluting 1500 to 2000 times the liquid. Orchids cultivated in such substrates are robust and rarely get sick.

two。 Pay attention to the cleanliness of the orchid room

The place where orchids are raised should pay attention to hygiene and remove the withered branches and rotten leaves as far as possible. When entering winter, the orchid should be moved indoors. When moving back, clean the room in advance and then clean up the diseased flowers and leaves and disinfect them with lime water to reduce the base of the pathogen as much as possible.

3. Strengthen management

Breeding orchids must strengthen management, careful maintenance, pay special attention to indoor temperature changes and timely conditioning, and pay close attention to the growth of orchids. Regular inspection, found diseased flowers, diseased leaves, should take timely measures to the orchids, closed with plastic bags, with pots to take outdoor treatment, shall not be put back to the greenhouse, reduce bacterial infection, according to the weather conditions appropriate windproof treatment.

4. Early stage of the disease

Carbendazim was sprayed on the whole basin for disinfection and sterilization. Orchids in the display should not be sealed, pots and pots should have a certain distance to prevent infection, ventilation and light, prevention and control of stagnant water, resulting in increased indoor humidity. On weekdays, in orchid management, pay attention to carefully, reduce orchid wounds as much as possible, and prevent germs from invading from the wounds.

5. Chemical control

Drugs such as carbendazim and chlorothalonil can treat Botrytis cinerea, which can be bought in ordinary florists. When using the medicine, you should pay attention to take turns to prevent and control drug resistance.

The above are the symptoms and prevention measures of Phalaenopsis Botrytis cinerea sorted out by the pro-agricultural network. We can see that as this kind of disease is more common, the methods of prevention and treatment are more mature, pay attention to observation during daily maintenance, and use medicine in time after the disease. can maximize the loss.