How is the yellowing on the pepper leaves?

The yellowing of pepper leaves may be a pepper virus disease. There are two most common capsicum virus diseases. One is variegated mosaic, which accounts for a large proportion. These plants are short, with mottled yellow-green leaves, sometimes brown necrotic spots on the veins, and brown necrotic stripes on the main stems and branches. The top leaves of plants are small, and the middle and lower leaves are easy to fall off. The second type is chlorosis and blight, which accounts for a small proportion, dwarfs plants and leaves are green, yellow-green, white-green or even albino. The top leaves of plants become smaller and longer, and brown necrotic ring spots often appear in the middle and lower leaves (there are many brown necrotic ring spots on the chlorosis and yellowing tissues), and sometimes the diseased leaves crack and fall off easily. In the later stage, axillary buds are clustered with small branches.

Control measures of yellowing of pepper leaves

1, cultivation and disease prevention. After pepper planting, the intercropping mode of planting every 4 rows 1 row of corn was adopted at the beginning of flowering and fruiting. Because corn plants are tall, they can attract aphids. In addition, in the hot summer when peppers are full of fruits, tall corn plants can also protect peppers from sunlight. It is recommended to know the control methods of common diseases of Dapeng pepper. 2. Choose disease-resistant varieties. Generally, early-maturing and spicy varieties have stronger disease resistance than late-maturing and not spicy varieties, and their seeds are disinfected. Soak the seeds in clean water for 3-4 hours. 3. Strengthen on-site management. Sow early in time, don't continuous cropping, apply more phosphorus and potassium fertilizer, and don't apply nitrogen fertilizer alone. Clean the countryside, reduce the source of bacteria, take the previous crops out of the ground, treat them centrally, and dig holes and bury them deeply. 4. Reduce pollution opportunities. Virus diseases are mostly spread by aphids and can be prevented by trapping and killing aphids. 5. Cultivation of strong seedlings Pepper and tomato belong to Solanaceae, and their seedling physiology is similar. The key is to have a strong seedling period. The strong seedling period of pepper should reach: (1) The seedling age should not be too long, and should be controlled in 70-80 days. (2) The plant height of the planted seedlings is similar to the transverse diameter of the plants, and it is controlled at 10- 15cm, with 5-6 true leaves. (3) When the plant height 10- 15cm, the diameter of the stem base should reach 0.5-0.6cm(4) The leaves are wide, thick, flat and green, and the stems are tender and strong. (5) Young roots are developed and tender. 6, chemical control, found that the diseased plants should be set aside and taken out of the field for centralized incineration, at the same time, according to the requirements of plant protection, spraying targeted drugs for control, spraying Haman virus powder bactericide for control in the early stage of chemical control, spraying 1 time every 5 ~ 7 days, 3 ~ 4 times in a row. Focus on spraying near the base and surface of diseased plants. The last spraying of the harvest should be carried out in strict accordance with the provisions of the pesticide safety interval.