What to do with the long white shift of autumn cabbage? What is the reason for the long white shift

Cabbage white spot disease mainly harms the leaves of cabbage, and the lesions become white and translucent in the later stage, and are easy to perforate. When the lesions are severe, the lesions are continuous, resulting in the early death of the leaves, affecting the quality of cabbage and directly causing losses.

For prevention and control methods, 64% manganese-zinc solution + 750 times of agricultural vitality hormone, or 50% iprodione 1500 times + 518 liquid fertilizer 600 times, or 25% azoxystrobin 1500 times + Jintailong top dressing 750 times. Spray once every 5-7 days, spray once every 3 to 5 days when severe, alternately, can effectively control the disease. Note:

Avoid mixing with emulsifiable concentrate products. Vegetable nets.

Summary. The reason for the long white shift is usually due to insufficient sun exposure. Greens need plenty of sunlight to photosynthesize, make nutrients, and help them grow.

When the sun is shining, greens photosynthesize, produce chlorophyll and use chlorophyll to feed themselves, resulting in a healthy green color in the leaves. When the sun is insufficient, the greens grow slowly, the plants are yellow and thin, and the leaves show white or yellow stripes, which is the so-called long-white phenomenon.

The reason for the long white shift is usually due to insufficient sun exposure. Green-banded sunnacai needs plenty of sunlight to produce nutrients and help it grow. When the sun is shining, greens photosynthesize, produce chlorophyll and use chlorophyll to feed themselves, resulting in healthy green leaves.

When the sun is insufficient, the greens grow slowly, the plants are yellow and thin, and the leaves show white or yellow stripes, which is the so-called long-white phenomenon.

Another possible reason for the pro-green sedan to sell the long white shift is that the soil lacks sufficient nutrients, such as nitrogen, phosphorus, potassium, etc., or the soil pH is too high or too low. These problems will affect the growth and nutrient intake of green vegetables, resulting in poor growth of plants, and then the phenomenon of long white shift.

Disease: Chinese cabbage white spot disease.

Chinese cabbage white spot disease is an important disease on Chinese cabbage, which mainly occurs in cold areas, which not only causes yield loss, but also affects the quality and storage of vegetables. This disease is often complicated with downy mildew, which aggravates its harmfulness. It mainly infects Chinese cabbage, cabbage, rape, turnip, radish, celery and snow mushroom, among which Chinese cabbage is more serious.

Symptoms are harmful leaves, at first gray round small spots, gradually expand into nearly round white lesions, there is a green halo on the edge of the diseased part, when it is wet, the surrounding water stains, the diseased part becomes thin and translucent, and sometimes the diseased part falls off into a perforation. The leaves are damaged, forming gray-brown sunken spots, often causing rot, and there is gray-brown mold in the diseased part.

Pathogen Cercosporella Albo-Maculans (Ell et ev) SACC belongs to the genus Cercospora of the subphylum Cercospora alba. Conidia are bundled, conidia linear, solitary, ascospores spindle-shaped or cylindrical.

Pathogenesis The pathogen overwinters with mycelium or mycelial residues in water or on seed collections, or overwinters with conidia attached to seeds. The germs are spread by wind, rain and irrigation water. The appropriate temperature for the onset is 5-28, the most suitable is 11-23, and the appropriate relative humidity is more than 50%.

Therefore, plots with early sowing, low-lying terrain, poor soil and weak growth are very prone to epidemics under rainy, dewy and foggy conditions.

Prevention and control methods. 1) Breeding and planting disease-resistant varieties according to local conditions.

2) Implement 2-3 years rotation with non-cruciferous vegetables.

3) Strengthen field management. Late sowing at the appropriate time, reasonable dense planting, and high furrow planting; Leveling the land, applying enough organic bottom fertilizer to improve the disease resistance of plants; Timely irrigation to prevent water accumulation after rain and reduce field humidity; Diseased plants are found in the field and removed in time, and the field is cleaned after harvest to reduce the source of bacteria in the coming year.

4) Seed disinfection.

50 formabi, or 70 mancozeb, or 75 chlorothalonil wet powder by seed weight, or 50 promedantoin by seed weight, or socrin wet powder by seed weight.

5) Pharmaceutical prevention and control.

Antaisheng 70% WP 700 times liquid, 50% carbendazim wettable powder 500 times liquid, 70% methyl tobuzine 700 times liquid, 70% mancozeb 500 times liquid liquid spray. In order to treat downy mildew, you can choose 700 times of mold and multi wettable powder, 3000-4000 times of 43% Haolik suspension, 500 times of 25% methafen, 250 times of 40% ethylphosphine aluminum, 400 times of 64% alum, and 500 times of 48% manganese zinc. Agents should be used alternately to improve the control effect and delay the emergence of resistance.

Commonly used agents Antaisheng, carbendazim, methyl tobuzin, mancozeb, mycogram, Haolik, methampheta, ethylphosphine, aluminum, alum, manganese-zinc.

Based on your description, I think it might be a viral disease.

At the seedling stage, the leaves turn green along the veins, and then turn into flowering leaves, the leaves are shrunken and uneven, the growth is slow, and sometimes brown necrotic spots or streaks are produced on the veins. The adult plant is damaged, the leaves are shrunken and uneven, with yellow-green flowers and leaves, and there are brown necrotic spots or stripes on the leaf veins, and the plant stops growing and dwarfs when it is severe.

This should be cabbage leaf spot disease.

Prevention and control methods. Strengthen cultivation management and rotate crops with non-cruciferous vegetables in alternate years. Fertilization, pay attention to the ratio of nitrogen, phosphorus and potassium, so as not to make the vegetable field lack fertilizer, so as to improve disease resistance.

Sow at the right time and avoid early sowing. After harvesting, deep ploughing and drying are carried out to remove the remains of diseased leaves in the field. Diseased leaves should be cooked and fed to livestock, or applied to vegetable fields after high temperature fermentation.

Vegetable plots are raised and deep ditches are dug to facilitate drainage and lower the groundwater level. Timely tillage weeding and removal of diseased and old leaves.

After removing a small amount of diseased leaves at the initial stage of the disease, spray 500 times of 50% tobuzin wettable powder, 600 times of 75% chlorothalonil, 500 times of 50% carbendazim, 500 times of 80% anthrax Fumei, 1:1:400 Bordeaux solution or antibacterial agent "401" 600-1000 times, spray once every 7-10 days, and spray two to three times in a row.