What are the four seasons and how to control them?

Four seasons orchid do a good job of pest control in order to ensure the quality of the market. The main diseases in the flowering period of the four seasons are blight and anthracnose, while thistle is the main pest. So how to control diseases and insect pests in the flowering period of orchids.

1. Soft rot of orchids at flowering stage

Soft rot is common in summer, and it is easy to occur in peach red, child prodigy and rainbow of Sijilan. In the early stage of the disease, there are fine black spots at the base of the bud core, and the buds stop growing and begin to wrinkle and droop. By the time they are pulled out, the base of the bud core is already black and rotten, with a thick snot like water immersion and a foul smell. The disease spreads quickly and should be prevented as soon as possible. When the leaves of the diseased plant look a little shrunk and the false bulb is a little yellow, it should be prevented and treated immediately. The main prevention and control measures are:

The main results are as follows: 1. The infected plants are removed and separated, and the basin medium is reduced at the same time, so that the corms are slightly exposed and keep dry.

2. To prevent and cure immediately, the commonly used pesticides are methyl topiramate, carbendazim, chlorothalonil, Dysen zinc and so on. The concentration of drugs used in the high temperature period in summer should be appropriately reduced to avoid drug damage caused by high temperature.

Anthracnose at flowering stage of four seasons orchid

Anthracnose is a common disease of four seasons orchid, which mainly harms the leaves. The disease spot on the leaf begins to be round or oval, the center is light brown or grayish white, the edge is dark brown or dark brown; in the later stage, black spots are produced, scattered or slightly arranged in a wheel. With the development of the disease, the disease spot on the leaf can expand into irregular spots up to several centimeters long, or the disease spot can be connected into a piece, and then cause the leaves to wither and yellow.

In addition to maintaining ventilation in the orchid shed, the steps of prevention and control of anthrax are also very important. Before spraying, clean up all the diseased leaves, remove the diseased leaves on the plant, and also remove the diseased and dead leaves that fall on the ground, and then spray pesticides, such as carbendazim, carbendazim, methyl thiophanate, and so on. Water the next day after spraying.

Thrips in the flowering stage of the four seasons

When the four-season orchid blossoms, the fragrance of the flower is distant, and it is easy to attract thrips to gnaw on the petals, which reduces the ornamental value of the flowers. when the harm is serious, it may also cause the petals to curl and not spread smoothly; thrips also absorb the juice of the leaves, making the leaves produce yellow-and-white spots, affecting their ornamental value.

The commonly used agents are enemy killing, dimethoate, phoxim and so on. When spraying during the viewing period of flowers, the concentration should be appropriately reduced to prevent drug damage.