The most frightening thing about growing flowers is this... the flowers will die if they are touched

White powder appears on rose leaves

Symptoms

If white powder appears on the leaves of the rose, it is most likely that the rose has powdery mildew. 1. The powdery mildew of rose mainly occurs from May to September every year. 2. The symptoms are quite obvious and can usually be seen on the leaves. Initially, the green color of the leaves will turn into yellow spots, and then a large number of white spots will begin to appear on the back of the leaves and gradually expand. In severe cases, the entire surface of the flower buds will be covered with white powder. Over time, it will cause the rose to shed its leaves and the flowers not to bloom. 3. The disease is particularly prone to occur when the weather is dry or the plants are weak.

Solution

1. In early spring, all diseased buds, leaves and branches should be pruned off in time. They can be buried in the soil or burned to prevent pests and diseases from infecting healthy leaves. 2. If powdery mildew is discovered in the early stage, you can spray 1500 times solution of 25% triadimefon, or spray 0.02%-0.03% potassium permanganate solution. 3. Normally, the roses should be given more ventilation, more light, less nitrogen fertilizer and more phosphorus and potassium fertilizer to enhance the resistance of the plants.

Black and brown spots on rose leaves

Symptoms

If brown or black spots appear on the leaves of the rose, it may be caused by black spot disease, gray mold or downy mildew. 1. Black spot disease and gray mold disease of rose mainly occur in warm and humid environment, and the general onset period is July-August. 2. The disease mainly appears on the leaves of the rose. In the early stage, black spots of varying sizes will appear on the leaves. In the later stage, they will gradually expand, appearing yellow-brown or dark purple, and finally turn into gray-brown. 3. In severe cases, the leaves will fall off and become bare.

Solution

1. In the early stage of the disease, you can spray 1000 times solution of 50% carbendazim, or spray 1000 times solution of 70% methyl thiophanate, both of which can effectively treat rose black spot disease. 2. In order to prevent the occurrence of downy mildew, you can spray 2000 times the concentration of mancozeb solution in advance for prevention. 2. If diseased branches and leaves are found on the plants, they should be completely cut off and destroyed in a centralized manner, and then lime sulfur mixture should be sprayed to play a preventive role. 3. Try to spray as little water as possible during the disease period, and only spray water in the morning when the weather is clear and the temperature rises, so that the water can evaporate quickly and avoid getting on the leaves.

Common scale insects on succulent plants

Symptoms

The most unavoidable thing when growing succulents is scale insects. 1. Common scale insects mainly attach to the back of succulent leaves or stems, and we can easily find them with the naked eye. 2. Scale insects are particularly easy to reproduce and multiply. The insects will crawl from one flower pot to another. If not treated in time, it is easy for all succulents to be invaded by scale insects.

Solution

1. The most primitive method is to use a needle, toothpick and tweezers to pick them to death one by one. However, this method only works when there are few scale insects. In fact, when insects are found on the leaves, there are basically a lot of insect eggs, so this method is no longer applicable. 2. Alcohol can be used to kill. You need to use alcohol with a concentration of more than 75%. Dip a brush in a proper amount of alcohol and repeatedly wipe the infested areas to kill the scale insects. If the branches and leaves are too dense and difficult to wipe, you can pour alcohol directly on the center of the leaves, which can also kill scale insects. 3. You can use 1:200 Huahushen solution or Supusha solution, add water and spray it. Spray it again after about a week, and the scale insects can basically be killed. 4. After spraying the medicine, it cannot be exposed to the sun. It is best to place it in a cool and ventilated place for 4-5 days and then move it to direct sunlight. Because if the succulents that have just been sprayed are placed directly in the sun, it will accelerate the evaporation of water, increase the concentration of the medicine, and easily burn the leaves.

(Source: Succulent APP)

Root mealybugs

Symptoms

Root mealybugs usually live in the soil and are difficult to detect with the naked eye. 1. It survives mainly by sucking nutrients from the roots, and then laying eggs to hatch. 2. It can only be discovered when changing the pot and soil, so the succulents you just bought home should be prepared to be cleaned. 3. The eggs of scale insects will be washed out of the flowerpot when watering. If they are contaminated by other soil and enter other flowerpots, they will spread rapidly.
(Author: Ermu Huahuanan Source: Sina Blog)

Solution

1. If you use drugs, you usually choose drugs such as Supusha or Jiebizhi. These drugs can only kill insects but cannot kill insect eggs in the soil. Therefore, they need to be used continuously. However, continuous use of drugs can easily cause damage to plants, so they should be used with caution. 2. If you find scale insects when repotting without using any medicine, it is best to use new soil, or expose the previous soil to the sun for a few months before using it; clean all the roots, trim them, soak them in clean water for about an hour, and then dry them before repotting. 3. It is best to reclean the previous flower pots to avoid scale insect eggs from sticking to them.
(Author: Ermu Huahuanan Source: Sina Blog)

Round dark brown spots appear on jasmine leaves

Symptoms

If circular spots appear on the leaves of jasmine, it is basically anthracnose. In addition to jasmine, camellia, crabapple, aloe, Milan, etc. are particularly susceptible to anthracnose. 1. Generally occurs in summer and autumn. 2. Most of them invade through wounds or weakened parts. 3. If the plant grows weak, has poor drainage, or is exposed to high temperature and high humidity, anthracnose will occur.

(Author: zyly1314ky Source: Camellia Bar)

Solution

1. Remove dead branches, diseased branches and fallen leaves from jasmine flowers and destroy them. 2. Apply more organic fertilizer, phosphorus and potassium fertilizer and ferrous sulfate solution to enhance the disease resistance of the plant. 3. Spray the new shoots after they emerge. You can use 800 times solution of 50% carbendazim, 1000 times solution of 75% thiophanate-methyl or 800 times solution of 80% anthracnose on the jasmine leaves. Spray once every 10-15 days. After 4-5 times in a row, the plant will be cured.

The leaves of Kalanchoe turn yellow and fall off

Symptoms

Red spider mites are a kind of pest that many plants will suffer from. Plants such as water lily and ivy are more susceptible to red spider mites. 1. If you have red spider mites, yellow-white spots will appear on the leaves, and then turn into gray-white spots. 2. If the plants are kept in a poorly ventilated place for a long time, or the plants are too dense, red spider mites will proliferate. 3. Generally, old leaves are more susceptible to the impact, and warm and dry environments are more likely to cause red spider mites.

Solution

1. If you find that the leaves are infected with red spider mites, remove the leaves immediately, clean them, and wipe the remaining leaves to prevent the red spider mites from spreading their damage. 2. If the pest is serious, spray the medicine in time. Generally, both sides of the leaves should be sprayed. Both chlorantraniliprole and amitraz are drugs that can be used, and they can generally be used according to the instructions. That’s all for today’s introduction to Huahua. Dear flower lovers, please take a look at the flowers in your home to see if they have any diseases or pests. (Note: The pictures are from the Internet, and the copyright belongs to the original author. Due to conditions, the source of some pictures cannot be found and the author is not marked. If your rights are infringed, please contact Huahua WeChat qdxixixixixi or QQ1273160598 for deletion or copyright payment.)

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