There are a lot of small red dots on the leaves of the osmanthus tree?

Most of the common diseases of osmanthus occur in the leaves, mainly including osmanthus brown spot, osmanthus blight, osmanthus anthracnose, these diseases can cause early defoliation of osmanthus, weaken the growth potential of the plant, and reduce the flower yield and ornamental value of osmanthus.

If you want to get rid of pests and diseases from the root, you have to detect them early.

Pest and disease control methods.

The main insect pest of home-farmed osmanthus is mites, commonly known as red spiders. It is what you call the red dot, once the disease is found, it should be dealt with immediately, and it can be sprayed with mites, aphid mites, and tri-sit (azole) tin. Spray evenly on both sides of the blade.

Once a week, 2-3 times in a row, you can**.

It may be a leaf spot disease of osmanthus.

The leaves are infected by certain pathogens or insect infestations.

If it doesn't hurt at first, you can prune the leaves.

If it is more severe.

You can go to the pesticide store and ask if there is a suitable medicine to spray.

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In this case, it should be the red spider, which can be sprayed with plant insecticides, and your condition is more serious, you can spray it once a week.

Hello, The reason why the new leaves of the osmanthus tree are red is that the phosphorus-deficient plants are dark green, often red or purple, and dark green when dry. The stems are short and thin, the basal leaves turn yellow, the flowering period is delayed, the seeds are small and not full; The leaves turn from dark green to copper, and the veins (especially petioles) are yellow with purple in color. Flower buds are difficult to form, and the flowers are small, few and pale in color, resulting in poor fruit development and even early wilting.

The role of phosphorus fertilizer in osmanthus trees.

Rational application of phosphate fertilizer can increase crop yield, improve crop quality, accelerate cereal tillering and promote grain fullness. Promote the flowering and fruiting of cotton, melons, eggplant vegetables and fruit trees, and improve the fruiting rate; Increase sugar content in sugar beets, sugar cane, watermelon, etc.; The oil content of rapeseed.

The full name is phosphorus fertilizer. Phosphate fertilizer is a fertilizer with phosphorus as the main nutrient, and the size (significance) and speed of phosphate fertilizer efficiency are determined by the content of effective phosphorus pentoxide, soil properties, fertilizer method, crop type, etc.

The newly sprouted leaves of the osmanthus tree are usually red because the newly sprouted leaves contain more anthocyanins.

Don't dare to talk nonsense, there are many kinds of leaf spot. However, as long as fungicides are used, most of them can be prevented.

Osmanthus brown spot disease, which is caused by the cercospora of the wood rhinoceros.

Prevention and control methods: select disease-free plants as propagating plants, strengthen cultivation management, and enhance tree potential.

Eliminate pests and diseases and reduce the source of infestation.

At the beginning of the occurrence, some small yellow spots appear on the leaves, scattered, and gradually turn into yellow-brown to gray-brown near-round spots, or irregularly shaped spots limited by the leaf veins, with a diameter of 2-3 mm and no obvious edges.

There is a yellow halo on the outer edge. A large number of fine gray-black mold spots are produced on the front of the leaves. Diseased spots can merge with each other to form large spots, causing leaf death.

When the seedlings in the seriously ill area are out of the nursery, they can be sprayed with potassium permanganate 1000 times for disinfection. During the onset of the disease or spray 1:2:

200 Bordeaux liquid, or 1000-1500 times of 50% benzolite wettable powder, or 1000 times of 50% antibacterial special wettable powder, or 800 times of 65% zebsen wettable powder.

Summary. The yellowing and rusty leaves of the osmanthus tree may be infected with anthracnose, which occurs between April and June. There will be spots on the leaves at the beginning of the disease, and they will slowly expand into yellow rust spots in the later stage.

Diseased leaves should be cut off as soon as possible and carbendazim and other fungicides should be sprayed. It can also be an infection with brown spot disease, which occurs between April and October. When found, the diseased leaves should also be cleaned up, and sprayed with Bordeaux liquid, antibacterial and other special agents.

What is the reason why the leaves of the osmanthus tree are yellow and there are spots on the reverse side?

The yellowing and rusty leaves of the osmanthus tree may be infected with anthrax, which occurs between April and June. There will be spots on the leaves at the beginning of the disease, and they will slowly expand into yellow rust spots in the later stage. Diseased leaves should be cut off as soon as possible and carbendazim and other fungicides should be sprayed.

It may also be infected with brown spot disease, which is usually born between April and October. When found, the diseased leaves should also be cleaned up, and sprayed with Bordeaux orange wheel liquid, antibacterial special agent and other agents.

This carbendazim works very well, and I often use it for my flowers and plants, and sometimes the insects will turn yellow.

The leaves are yellow and dry, mainly new leaves and tender teeth, and the old leaves are better.

The soil quality of your flowers, the method of the root system, may not be nutritious enough, I often use the leftover black tea to cool through, to wash the rice water, the effect can be.

It's not a bonsai, it's a big tree.

There is also the best spray of water is placed for a few days, so that it can be precipitated, the flower is good, the soil quality of the roots of the osmanthus tree is slightly higher, you are not a little cold, the old leaves are fine, the new leaves are yellow, it is estimated that it is frozen, if it is a tree, add a fiber plastic film to prevent freezing, in fact, the old leaves generally love to yellow, that is, the insect or the stool erected anthrax jujube.

However, in this winter season, it is not easy to get this disease, and it is generally easy in summer, and it is estimated that it is frozen.

Look**, it feels like it's a pest.

You spray it with some medicine!

3. The new leaves of all osmanthus flowers are always not growing well, and they are dense, what is the reason?

The leaves of the osmanthus tree have yellow spots, and the reason is that they are these two kinds of things, and they should be known and prevented early.