Complete treatment of stem rot of orchids

Complete treatment of stem rot of orchids

Symptoms:

Usually, the mature orchid leaf sheath and the tissue near the base of the leaves are damaged first, from the inside to the outside, and in severe cases, the pseudobulbs rot deeply, and then cause the wilting of the leaves. The lesion and cross-section can sometimes be seen as dark brownish red.

The symptoms of the disease are not obvious after infection, the high temperature in summer is acute, and when the temperature is low, the course of the disease will be very long, several months or even longer, and the death will be very miserable.

It is the most harmful disease of Huilan.

Germs:

The pathogen belongs to Fusarium oxysporum, whose hyphae are segmented and produce two kinds of spores, the microspores are spindle-shaped to oblong-shaped, and the macrospores are generally sickle-shaped, hence the name. The strain is white, pink to purplish red, and the diseased tissue is sometimes brownish red.

Conditions of onset and route of transmission:

Trauma, acidic materials and high temperature are easy to spread the disease. It is also common to go down the mountain grass with disease. The bacterial bracts overwintered in the diseased and residual tissue and carrier matrix and invaded through water, wound and manual operation.

Prevention and treatment:

Pay attention to the diseased grass down the hill.

2. Irrigate and prevent it once with 800 times solution of dimethazone in the season of high temperature and frequently occurring disease.

3. Irrigate with 800 times of dimethazone when the grass is down the hill and on the basin.

4. Replace the diseased grass with new pots and soil, and irrigate with 800 times of dimethazone as water. After drying, water and medicine are used for three consecutive times as a course of treatment. It's usually curable.

Enemy Kesong:

The yellowish brown powder, the aqueous solution is reddish brown, which is sensitive to light and will decompose in direct sunlight.

This is a kind of soil fungicide, which has internal absorption and permeability in plants, and can maintain its efficacy for a long time after being absorbed by plant roots and leaves. It's harmless to plants.

It is harmful to people and animals. Wash hands with soap after use.

It is generally available in agricultural stores.

It is found that after:

Dimethazone is not a new drug, it is mainly used in agriculture for soil disinfection, and some experts unconsciously put forward it to prevent orchid diseases, but there is no evaluation on what disease to prevent, how to prevent, and the effect of control. In the drug screening of orchid stem rot for many years, I found that this medicine has a particularly good effect on the prevention and treatment of orchid stem rot. After guiding orchid friends to treat and prevent orchid stem rot in a large area, the effect is really good. It can be said to be a complete treatment of orchid stem rot, and can prevent orchid stem rot in a large area in time, which well solves the problem that orchid stem rot is incurable. (adapted from Liu Jingqiu's speech on the prevention and control of common orchid diseases and pests)

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