What is the matter with the yellow leaves of Phalaenopsis? What should I do if the leaves turn yellow?

1. The temperature is too high

Phalaenopsis grows best in a warm environment. Too high a temperature will cause the plant to enter a dormant state and accelerate water evaporation, causing the leaves to turn yellow due to water loss. Normally the temperature in summer should not exceed 30℃. If the temperature is too high, it is necessary to spray water around to cool it down. At the same time, good ventilation should be maintained to prevent bacterial growth.

2. Excessive water and fertilizer

Phalaenopsis likes moisture and requires sufficient nutrients during its growth process, but excessive water and fertilizer can easily affect the growth of the root system, causing it to rot and the leaves to fall off. When watering in daily maintenance, be sure to pay attention to the amount of water and do not let water accumulate in the potting soil. Fertilization is mostly done during the growth period, in small amounts and multiple times. The fertilizer should be light rather than concentrated, and compound fertilizer is generally used.

3. Strong light

Phalaenopsis orchids are generally grown in a bright place indoors so that they can receive scattered light. If the light is too strong, the leaves can easily get sunburned and turn yellow. Usually, the time for sun exposure must be chosen in the early morning or evening. Appropriate shade is needed at noon. The sunlight is not strong in winter, so the plant can be exposed to the sun all day, which will help it survive the winter.

4. Pest and disease attacks

If the Phalaenopsis orchid becomes sick or infested with insects during its growth process, its leaves will also turn yellow. In this case, the diseased branches and leaves need to be cut off in time and burned in a centralized manner to prevent the spread of the pathogen. In addition, drugs should be sprayed, usually carbendazim or thiophanate-methyl for treatment. Pests can be eliminated by spraying insecticides such as dichlorvos.