What kind of disease is this pepper, teacher? Teacher, what is the disease of this chili pepper?

Hello! Pepper anthracnose, it is recommended that you focus on prevention! After the occurrence, 30 ml of 40% benzoprochloraz, or 10 ml of pyroxystrobin, or 5 grams of 75% oxime tebuconazole, or 20 grams of 42% biguanide prochloraz, or 15 ml of 20% dicyananthraquinone-pyraclostrobin and other agents are sprayed alternately for prevention and control!

Add brassinolide once every 5-7 days, 2 times in a row, for better results!

There are two possibilities for the whitening of pepper leaves: one is caused by high temperatures, with too strong sun exposure. There is also a possibility that it is caused by drug damage, such as not controlling the concentration of the drug well, or overspraying the drug, etc. The other is paprika powdery mildew.

Prevention and control methods: select disease-resistant varieties and implement crop rotation for more than 2 years.

Generally, pepper powdery mildew, most of which are caused by fungi, the disease will only damage the leaves, and the old or young leaves can be damaged, generally starting from the bottom of the leaves to develop upward. At the initial stage, the front of the leaf is covered with light yellow brown spots, without clear edges, and the white powdery mold is not obvious. At the beginning of the mold layer, the mold layer is sparse, often limited by the leaf veins, forming many triangular white spots, and in the later stage, the white spots are cracked and the branches are connected into pieces, so that the whole leaf back becomes white.

In severe cases, it will cause the leaves to fall off, leaving only a few leaves at the top of the plant, exposing the fruit to the sun, causing sunburn, and seriously affecting the yield and quality of peppers.

For pepper anthracnose, spray with 56% azoxystrobin chlorothalonil 600 times or 68% methafrost manganese zinc 800 times solution at the beginning of the disease, or 38% xoxazine copper strobin 800 times liquid has a prominent effect! At the same time, it can be compounded with conventional agents such as: 80 Dasheng M % Daknin, 65% zebsen zinc, spray once every 7 10 days, spray 3 times.

Pepper navel rot, also known as pepper stem rot, is a non-infectious physiological disease. The main damage is the fruit. Damaged fruits usually have brown necrotic spots in and near the remnants of the flowers.

At first, dark green water-stained spots appeared, then enlarged and turned yellowish-white or light brown, amorphous, with a transverse diameter of up to 2 3 cm, and even expanded to half a pepper fruit. Some fruits will begin to turn red at the junction of the sick and the healthy, and ripen early. The affected tissues are shrunken, the surface is slightly sunken, and they are often infected with weakly parasitic or saprophytic fungi, and are black-brown or black.

Mainly caused by calcium deficiency, foliar sprays of calcium sugar alcohols, boiled calcium, calcium nitrate and other boron fertilizers, 2 to 3 times of continuous spraying at intervals of 7 days. It is necessary to spray calcium fertilizer and boron fertilizer in advance, and prevention is the priority.

Pepper umbilical rot is a physiological problem, caused by abnormal temperature or unbalanced water and fertilizer, and lack of calcium in the body, which cannot be prevented in advance. If you get sick, you should remove it as soon as possible, and there is no commodity value.

Umbilical rot only harms the umbilicus of the fruit, and the diseased part is generally not rotten, there is no mold layer (there is also the case of saprophytic bacteria reproduction), there is no odor, and other parts are normal.

After fruit set, the foliar surface is often sprayed with calcium fertilizer, preferably organic calcium such as sugar alcohol calcium, which can be mixed with other pesticides to spray together, and the top dressing should be balanced fertilization to reduce the amount of nitrogen fertilizer. If there is too much nitrogen fertilizer, the root system will not absorb calcium fertilizer well. Watering fertilizer should be watered frequently with small water, and water supply fertilizer should be balanced.

Pepper stem base rot.

Fungal diseases, dark brown irregular lesions occur at the base of the stem, severe cortical necrosis at the base of the stem, atrophy and thinning, and wilting and death of the upper leaves.

Prevention and control: In the early stage of the disease, you can use R. solanacearum rick, garlic oil, and thirdly, in the early stage of the disease, occultamine acetate, formabi, carbendazim, etc., alternately spray, root irrigation control, once every 5-7 days, 2 3 times in a row.

Due to the production process, content, and hidden ingredients of pesticide companies, please go to the local distributor to seek the ideal insecticide and better solution according to the condition.

Good morning friends.

1. Harmful symptoms of capsicum gray mold.

At the seedling stage, it is harmful to leaves, stems and terminal buds, and the apex of the diseased first cotyledons turns yellow, and then expands to young stems, shrinks and becomes thinner, and often falls down from the diseased part and dies. The adult stage is harmful to leaves, flowers and fruits. Most of the leaf damage starts from the tip of the leaf, initially becomes a light yellow-brown lesion, and gradually expands upwards into a "V" shaped lesion.

The stem produces water-stained lesions, and the diseased part dies above. The flowers are damaged, and the petals are wilted. Fruit damage, mostly starting from the adhesion between the young fruit and the petals, is a water-stained lesion, and causes brown spots in the whole fruit after expansion.

The junction between the sick and the healthy is obvious, and there is a gray-brown mold layer in the diseased part.

2. Prevention and control methods of pepper gray mold.

1.Strengthen the ventilation of greenhouses and greenhouses. Watering should be carried out in the morning on a sunny day, and the amount of water should be controlled and not excessive. After the rain, the stagnant water should be removed in time, and the shed should be reasonably ventilated and cooled;

2.Removal of the source of bacteria. Remove the diseased fruit in time and take it out of the greenhouse and greenhouse to bury it deeply. After harvesting, the diseased plants are thoroughly treated, and the diseased leaves and branches are turned deep into the depths. Mulching cultivation can reduce the occurrence of gray mold.

3.Pharmaceutical prevention and control. For the disease of plants in the protected area, 250-300 grams of 15% Pythium fumigant can be smoked, smoked once every 5-7 days, and smoked continuously or alternately 2-3 times.

It can also be used with 1000-1500 times of Lvheng 70% pyrimethamine water dispersible granules, 700-800 times of Lvheng 30% Pyrimethoxamine Fumei double suspension or 600 times of clove carvacrol aqueous solution, with Lvheng No. 6 (50% chlorobromoisocyanuric acid soluble powder) 750-1500 times or Lvheng copper master (cuprous oxide) 1500 times spray can strengthen the prevention and control effect of gray mold, and at the same time prevent and control various complications, there are also special effects on bacterial diseases, spray once every 7-10 days, Spray 2-3 times in a row depending on the condition.

Blight + sunburn.

Pepper blight can be protected and prevented with cyanofrostazole, flupride, copper preparations, daimeng, propyl zinc, etc., and ingredients such as enoylmorpholine, flumorpholine, methalen, cyanide, fluopyramide, downy mildewcarb, ethylphosphonic aluminum and other ingredients**.

Pepper sunburning, uneven water and fertilizer, caused by direct sunlight, should be reasonable water and fertilizer, appropriate shade, strengthen water and fertilizer management, improve resistance.

Downy mildew of peppers, petioles and young stems. (1) Blades. The leaves are irregularly diseased at the time of disease, there is a sparse white thin mold layer on the back of the leaves, the diseased leaves become brittle and thick, slightly rolled upward, and the diseased leaves are easy to fall off in the later stage.

2) Petioles, young stems. The lesions are brown and water-stained, and the affected areas also have a white sparse mold layer. The field symptoms of the disease are similar to those of powdery mildew, and microscopic examination is required to identify the pathogen if necessary.

Capsicum leaf mildew, which initially appears as light yellow on the leaves, irregular greenish patches, and a pale white mold layer on the back of the leaves; Soon, the front of the leaf becomes light yellow to yellow large spots, and the number is large, not limited by the leaf veins, and the mold layer on the back of the leaf gradually changes to light gray to black-brown villous mold. As the disease spreads, the leaves gradually turn into spots from bottom to top, and in severe cases, they turn yellow and dry up. Compared with downy mildew, the leaves of leaf mildew disease did not become brittle, thickened and rolled up, and the leaves rarely fell off in the later stage.

Leaf mold disease starts from the lower leaves at the beginning, while downy mildew mostly starts from the middle leaves.

Powdery mildew is mainly leaf damage. At the beginning of the disease, there are yellow spots with inconspicuous edges on the front of the leaf, and sometimes some necrotic tissues will appear in the yellow spots, and even necrotic spots will be formed, and a white mold layer can be seen on the back of the leaf. At the beginning of the mold layer, the mold layer is sparse, often limited by the leaf veins, forming many triangular white spots, and in the later stage, the white spots are connected into patches, making the entire leaf back white.

Powdery mildew tends to cause leaf shedding, and in severe cases, only a few leaves on the top of the plant remain, exposing the fruit to sunlight and causing sunburn. After the diseased leaves fall off, if the environmental conditions are not suitable for the occurrence of the disease, the disease will be significantly reduced or stop occurring, the plant**.