The flowers and leaves of the cultivated flowers have dry spots, what is the reason?

Leaf blight. Symptom.

Leaf blight mostly occurs from the leaf edge and leaf tip, the lesions are irregular from small to large, reddish-brown to gray-brown, the lesions are connected into large blight, the dry area reaches 1 3-1 2 of the leaves, and there is a deeper band than the lesion at the edge of the lesion; The boundary between disease and health is clear. Later, some small black spots are produced on the lesions. Such as osmanthus leaf blight (also known as blight), plum leaf blight, aster leaf blight (also known as spot blight).

The diseased leaves turn yellow at the beginning, and the yellow part gradually turns brown and dies. It extends from local to the whole leaf vein, showing brown to reddish-brown leaf margin lesions, with wavy edges and dark color. The junction of the diseased bonds is obvious, and its outer edge sometimes has a shallow yellow band of unequal width and narrowness, and then the lesion gradually extends to the base of the leaf until the whole leaf turns brown to grayish-brown.

This is followed by the appearance of black villi or small black dots on the dorsal or frontal surface of the diseased leaves.

Pattern of onset. Leaf blight overwinters on diseased leaves, and the spores of the fungus spread to the host plant by wind and rain when the temperature is suitable in the following year. The disease can occur from July to October.

The lower leaves of the plant are severely diseased. High temperature, humidity and poor ventilation are conducive to the occurrence of diseases. The disease is more severe when the plant growth is weak.

Prevention and control methods. In autumn, the diseased leaves are completely removed and burned intensively to reduce the infection of the following year**.

Strengthen cultivation management and control the occurrence of diseases. The planting land should be well drained, the soil should be fertile, and organic fertilizers should be added.

and phosphorus and potash fertilizers. Control the planting density to ventilate and transmit light, reduce foliar moisture, and reduce the chance of infestation. Changed to spraying.

Drip irrigation or running water irrigation to reduce the spread of germs.

During the growing season, sprays are sprayed every 10 days or so from late June to October.

Medicine, spraying several times can be effectively prevented. Commonly used agents are 1:1:100 times Bordeaux liquid, 50% Tobuzin 500-

800 times liquid, 50% carbendazim wettable powder 1000 times (or 40% suspension 600-800 times % benzolite 1000-15

00 times, 65% Dyszeb 500 times liquid, etc., can be used or alternately.

Raising moon flowers, "3 tricks" to solve the problem that the leaves do not grow large and the bud points become dry.

There are a lot of friends who raise flowers. Novices often encounter this disease, but it is not curable. Today, I'm going to teach you how to solve it.

You see, this is the disease. The diseased leaves are as if they have been burned, with uneven patches on the leaves. If the leaves do not grow, they will slowly die and fall.

Many people think it's sheath blight or anthrax, but it's actually a similar disease. 1.Leaf mites.

Let's take a closer look. There are such spots on the leaves, especially on the new shoots and old leaves. This is actually a leaf mite, which is equivalent to a spider mite.

The white spider is a leaf mite of the genus, and the white spider is only a middle curve. This is also called a mite, much like a baby mite. Many people use fungicides or insecticides to kill them, but they have no effect, so they will repeat**.

If you can't, it will spread over a large area and be very contagious. 2.After encountering this mite, it is recommended that you use a caricidal drug.

We can use pyridoxin, spirofen, acarfen, etc. If you want to save money, you can use pyridoxin spirofenoxil, which has a good effect, but the more expensive mite ester has a particularly good response effect. It's very strong to kill this mite and the like.

Spray once every four days, basically once or twice or two or three times, and you will find that the effect will gradually get worse. You can kill these mites, especially novice friends. It's easy to confuse these diseases, so they are often not cured.

You can try these solutions.

In the case of the moon, it grows black spots because it has black spot disease, which usually occurs on plants of the Rosaceae family. In the early stage of the disease, the diseased branches and leaves should be removed immediately and burned in a concentrated manner.

If the situation is very serious, it is necessary to use Tobzin**. In the usual maintenance, pay attention to the moisture of the soil, ventilate it, and do not sprinkle water directly on the leaves.

1. Reasons. 1. If it grows black spots, then it must have been eroded by black spot bacteria. The disease mainly affects the stems of leaves, branches and flowers. Spots often grow on the front of the leaf, and at first on the edge of the leaf.

2. The spots are purple-black at the beginning, and then the diameter will reach and the color will be darker. The lesions are surrounded by yellow halos, and eventually the spots connect, causing the branches to fall off.

3. This bacterium is more harmful to the plants of the Rosaceae family, and spreads by spores, if there is water on the leaves, it can invade the leaves within six hours, and then repeatedly decompose. It is possible to get this disease throughout the growing season. In particular, when there is a high temperature and heavy rain, the rainy season and November are the peak seasons.

Second, the method of **.

1. If it is found in the early stage of the disease, the branches and leaves of the disease should be removed immediately, and it should not be directly thrown into the soil, but it should be burned in a centralized manner to cut off the source of the disease.

2. If the situation is very serious, it is necessary to use drugs such as pyrine to prevent and control, or use tobuzin**.

3. In the usual maintenance, we should pay attention to the moisture of the soil, apply the water-soluble fertilizer of Caifa, ventilate it, and do not directly sprinkle the water on the leaves, so that it can be well prevented.