Control of common physiological diseases of orchids and diseases of edible fungi

Some physiological diseases often occur in orchid cultivation, so attention should be paid to timely prevention and control.

Sunburn

Also known as sunburn, it is mainly caused by strong direct sunlight in midsummer.

Prevention and treatment: can be shielded by a sunshade net to ensure that there is no direct sunlight.

Plant weakness

Due to the lack of light, the stems and leaves of the diseased orchid plant grew only long, and the leaves became thinner and yellowish green.

Prevention and treatment: the diseased plant can be moved to a place with sufficient light, so that it can get more appropriate light.

Root rot

Mainly due to excessive watering, the plant wilted and the root system was damaged by water bubbles, resulting in different degrees of root rot.

Control method: immediately suspend watering, pour out the diseased plant, cut off the rotten root first, and then replace it with new soil and replant it.

Falling flowers and buds

It is usually caused by drastic changes in environmental conditions, such as temperature and light suddenly becoming too low or too high, or excessive drought due to lack of watering for a long time.

Prevention and treatment: improve the indoor environment, pay attention to ventilation or heat preservation, do not be too hot or too cold. In addition, maintaining high humidity and adequate watering is also an effective measure to prevent the occurrence of bud drop disease.

Plant shrinkage

It is mainly caused by drought and lack of water, which is characterized by dry and wrinkled fleshy air roots, withered pseudobulbs and loss of luster of leaves.

The method of prevention and control is to replenish water immediately so that the orchid plant can be restored to its original state after fully absorbing water.

Frostbite

The results showed that the tissues such as leaves, pseudobulbs and air roots showed watery necrosis after freezing.

The control method is to cut off the withered roots and fallen leaves immediately, stop watering and keep them in a warm place above 15 ℃.

Scorched leaf tip or leaf margin

It is mainly due to excessive sunlight, or underwatering or the basin is too small to cause root entanglement together, showing that the leaf tip or leaf edge is scorched and blackened, and when it is serious, the scorched surface continues to expand, so that most of the leaves are scorched.

Control method: first cut off the leaves of the scorched part and pay attention to spraying plants when watering to improve humidity. If the basin is too small, the basin should be changed in time to make the root system stretch and grow.