Common diseases and control of Phalaenopsis

Phalaenopsis is one of the most ornamental flowers in Orchidaceae, which is loved by the public. In the process of cultivating Phalaenopsis, the prevention and control of diseases and insect pests is undoubtedly a very key link, the following talk about Phalaenopsis has written about common diseases and control methods.

Common diseases and control of Phalaenopsis

Anthrax

Pathogeny

It is not well ventilated in a warm and humid growing environment.

Disease symptoms

Leaves are the most vulnerable to harm, the initial leaf tip and leaf edge will appear small yellow spots, gradually become round or irregular yellow-brown or black-brown spots, later spots into patches and black spots on it.

Prevention and cure

First of all, adequate ventilation and light transmission should be carried out, and then the management of water and fertilizer should be strengthened. the application of nitrogen fertilizer should not be too much, and the application of appropriate amount of zinc fertilizer can increase the thickness of leaves and improve disease resistance. to prevent this disease, the same amount of Bordeaux solution, 65% concentration of mancozeb and 75% concentration of chlorothalonil can be sprayed once every 7-10 days, three times. If the disease has occurred, spray anthrax 800 times, carbendazim 50% times and Shibao Gong 1000 times, once every 7-10 days, 2-3 times.

Grey mold disease

Pathogeny

It is easy to grow in a humid environment where the temperature is too low.

Disease symptoms

Flowers are the most vulnerable. At the beginning of the disease, waterlogged spots appear on petals and sepals, and then slowly form (dark) brown round patches, and in severe cases, the whole flower will wither, greatly reducing the ornamental value of Phalaenopsis.

Prevention and cure

Also need good ventilation and light transmission, at this time to maintain a relatively dry growth environment. Diseased flowers should be removed immediately, otherwise the disease will be contagious. The control can be sprayed with 65%-fold solution of Dysen zinc wettable powder, 1500-fold solution of 50%-fold Sukeling wettable powder and 3%-fold solution of Doc bacteria, once every ten days and 2-3 times.

Soft rot

Pathogeny

The long-term effect of hot and humid weather.

Disease symptoms

At the beginning of the disease, there are transparent, water-soaked spots on the leaves, and in the later stage, the small spots will expand into brown spots to make the leaves rot and produce a stench. The disease spreads quickly and does great harm. If the disease is serious, the basal stem will rot and the plant will die in a short time.

Prevention and cure

The first step is to control moisture and stop spraying water can effectively cut off the transmission of the disease; at the beginning of the disease, 1000 times of agricultural streptomycin of 72% concentration, 80 times of polyantimycin of 10% concentration, 800 times of wettable powder of 50% concentration and 4000 times of neophytomycin can be sprayed every ten days for 2-3 times in a row.

Brown spot disease

Pathogeny

It is easy to be affected by high temperature and humid season, especially in typhoon or rainstorm.

Disease symptoms

At the beginning of the disease, the light brown water-immersed spots gradually become brown or black (oval) round irregular spots, the yellow halo can be seen around, the disease is easy to aggravate, and do great harm to the survival of the seedlings. the leaves of the old plants with serious disease will appear dry or yellowing, and then all will fall.

Prevention and cure

The control measures of this disease can refer to soft rot.

White silk disease

Pathogeny

The plum rain season is the high incidence period of the disease, and it is also easy to occur in other hot and humid weather.

Disease symptoms

At the beginning of the disease, there are yellow-brown water-like spots on the rhizome, and then expand into brown spots. Affected by high humidity, white silky hyphae and mouse dung-like sclerotia appear, resulting in the final death of the diseased plant.

Prevention and cure

First of all, ventilation measures are in place, do not make the potted flowers and plants too dense. Spray 1000-fold solution of 50% concentration of Fodonine or 2000-fold solution of 75% concentration of metoprolol for control, once a week for 3-5 weeks.