Common Physiological Diseases of Orchids and Control Methods for Edible Mushroom Diseases

Some physiological diseases often occur in orchid cultivation and should be controlled promptly.

Sunscald

Also known as sunburn, it is mainly caused by scorching from intense direct sunlight in midsummer.

Control method: Use a shade net to block the light, ensuring no direct sunlight enters.

Weak Plants

Caused by insufficient light, affected orchid plants grow leggy stems and leaves, with leaves becoming thinner and yellow-green in color.

Control method: Move the affected plants to a place with ample light so they receive more appropriate illumination.

Root Rot

Mainly caused by overwatering; plants wilt, the root system is damaged by waterlogging, resulting in varying degrees of root rot.

Control method: Immediately stop watering, remove the affected plant from its pot, first cut off the rotten roots, then replace with fresh soil and replant.

Flower and Bud Drop

Usually caused by drastic changes in environmental conditions, such as temperature or light suddenly becoming too low or too high, or prolonged drought due to lack of watering.

Control method: Improve the indoor environment, pay attention to ventilation or insulation, and avoid excessive heat or cold. In addition, maintaining high humidity and adequate watering are also effective measures to prevent bud drop.

Plant Shriveling

Mainly caused by drought and lack of water, manifested as dry and wrinkled fleshy aerial roots, shriveled pseudobulbs, and dull leaves.

The control method is to immediately replenish water so that the orchid plant fully absorbs water and returns to its original condition.

Cold Injury

Manifested as water-soaked necrosis of leaves, pseudobulbs, aerial roots and other tissues after freezing damage.

The control method is to immediately cut off the frozen dead roots and withered leaves, stop watering, and place the plant in a warm location above 15°C for care.

Leaf Tip or Leaf Margin Scorch

Mainly caused by excessive sunlight, or insufficient watering or a pot that is too small causing roots to become tangled together; manifested as scorched and blackened leaf tips or margins, and in severe cases the scorched area continuously expands, causing most of the leaf to become scorched.

Control method: First cut off the scorched parts of the leaves, and pay attention to spraying the plant when watering to increase humidity. If the pot is too small, repot promptly so that the root system can spread out and grow.