Why your orchid is not growing well? Just look at the leaves.

Yellowing orchid leaves

There are many reasons why orchid leaves turn yellow, and the degree of yellowing will vary. Let's talk about them in detail:

1. The leaves of the orchid are turning yellow and the plant is growing normally.

It may be caused by excessive light. Orchids are afraid of direct light. At this time, it is best to move them to a place with relatively soft light.

2. The orchid leaves turn yellow and the new buds are smaller.

Possible reasons for this situation include: excessive light, lack of nitrogen fertilizer, insufficient humidity, etc. At this time, it is necessary to reduce the lighting time appropriately, add an appropriate amount of nitrogen fertilizer to the orchid, and use a small amount of water to increase soil moisture. Specific measures can be chosen according to actual conditions.

3. The orchid leaves turn yellow and fall off quickly.

This phenomenon can be caused by excessive watering, improper repotting, etc. At this time, it is best to reduce the amount of watering or repot.

Orchid dead leaves

In this case, your orchid may have leaf blight. In the early stage of the disease, there may be only small spots on the tip or front of the leaf, but the spots will gradually become larger, forming gray-brown spots, and finally the entire leaf will die.

Prevention and control measures:

1. Improve ventilation, avoid placing flower pots too densely, and update the potting soil in a timely manner.

2. Remove dead leaves in time to prevent the spread of the disease.

3. Chemical control: Bordeaux mixture can be used before the disease occurs, spraying once every 7 to 10 days, which has a good protective effect. During the disease period, you can spray carbendazim or methyl thiophanate solution to control the spread of the disease.

Spots on orchid leaves

anthrax

Irregular spots such as semicircular, circular, and elliptical shapes appear on the leaves, and some spots are connected to each other to form dead lines running from the tip of the leaf downwards.

Prevention and control measures:

1. Cut off the diseased leaves and spray Bordeaux mixture 1 to 2 times.

2. Spray medicine regularly to protect new leaves.

3. Strengthen fertilizer and water management, and improve ventilation and light conditions.

Viral infection

Stripes appear along the leaf veins, and the leaves show symptoms of local necrosis. In severe cases, the flower buds may also die.

Prevention and control measures:

1. It is best to isolate orchids that develop these symptoms from other plants.

2. The tools used for orchid cultivation should be disinfected in time to prevent the spread of viruses.

3. Pay attention to the prevention and control of aphids at ordinary times: dilute the dimethoate emulsifiable concentrate with water and then spray it.

4. You can use Isatis root tablets to treat viral diseases. After buying Isatis root tablets, mix 2 tablets with 100 ml of water, prepare a basin of Isatis root solution, take the upper clear liquid into a sprayer, and spray the entire orchid plant thoroughly; the remaining residue can be used to water the orchid roots (100~200ml is enough). Once every 3 days, and after 7 times, change to once a week, for a total of about 10 times.

Round spot disease

Small brown-red spots first appear on the leaves, then gradually expand into circular or semicircular dark brown spots, and later gradually fade to dark brown spots with dark brown edges and light brown in the middle.

Prevention and control measures:

1. Clean up the diseased and dead leaves, and cut off the diseased spots in the upper and middle parts in time.

2. You can spray medicine for protection. You can choose thiophanate-methyl solution, twice a month.

Orchid leaves have burnt tips

The burnt tips of orchid leaves may be caused by excessive fertilization or unclean planting materials.

Prevention and control measures:

1. Cut off the burnt tip in time.

2. Strengthen water and fertilizer management. At this time, reduce the amount of fertilizer and thoroughly disinfect planting tools and soil.

3. Pay attention to prevention and spray medicine regularly, such as thiophanate-methyl, once every 7 to 10 days.

Orchid leaves turning black

This symptom may be caused by two situations:

1. If the orchid leaves appear purple-black and the back of the leaves are still green, it may be caused by low temperature frost or lack of phosphorus fertilizer. At this time, the orchid should be moved to a relatively warm environment and supplemented with an appropriate amount of phosphorus fertilizer.

2. If the pot is too humid and hot, your orchid’s roots may rot. At this time, you must take measures:

① Treatment of diseased plants. Remove the diseased plants, rinse them with clean water, and use a knife to completely remove the rotten parts. Soak the orchid plants in 0.1% potassium permanganate solution for 30 minutes. After taking them out, apply wood ash on the wounds to prevent infection, and then replant them.

②Preventive measures. Pay attention to ventilation, prevent the soil in the pot from being too wet, and do not apply too much fertilizer to the roots.

After seeing so many symptoms, have you found one that suits your orchid?

Take the right remedy now!