The major diseases of Chinese cabbage refer to viral diseases, downy mildew, dry heartburn and soft rot, which are caused by rapid onset and heavy damage, and are likely to cause a large area of ​​reduced production or even total production. Therefore, in the process of its growth, it must be rigorously managed and timely prevention and treatment of diseases should be found so as to avoid serious losses.
Garden Used Power Tiller is a small professional machine,Small in size and light in weight, it can be widely
used in the shallow rotation and weeding of tea gardens, orchards, greenhouses.
Four-wheel drive Diesel Engine machinery adopts the
method of skin-frozen transmission, which is easier and the operation quality
is higher. Trinity of weeding, ridge and ditch, belt drive,
more efficient mechanical operation, simple structure and convenient operation
Mini Tiller Machine,Mini Garden Tiller,Garden Used Power Tiller,Best Small Garden Tiller Henan Qianli Machinery Co.,Ltd. , https://www.chalionagri.com
I. Viral disease
1. Symptoms of the disease This disease, also known as solitary brucellosis, is a major disease during the seedling stage of Chinese cabbage. The seedlings are most susceptible to disease before 6-7 leaves. The leaves exhibited dense and thin lesions, curled, and shrunken, and brown necrotic spots or streaks on the veins. Early onset can not be heart-wrenching, the onset of late growth is slow, the bulbs are crumpled and uneven, covered with small spots of taupe necrosis, losing the value of food.
2. Transmission pathways Transmission of Chinese cabbage virus disease The insects are aphids. When the cabbage seedlings are exposed to high temperature and drought, the incidence is heavy.
3. Control methods 1 selection of disease-resistant varieties. Such as Feng Kang 78, Feng Kang 80, Beijing -75, Shandong No. 4 and so on. 2 Appropriate late broadcast. It is advisable to sow cabbage in autumn for 3-5 days before and after the beginning of autumn. 3 control locusts. Use 50% anti-inferiority WP 2000-3000 times or 40% Dimethoate 800 times or 2.5% deltamethrin 3000 times. 4 chemical control. In the early stage of disease, spray 20% of virus A wettable powder 500 times, or 1.5% of diseased Ling emulsion 1000 times, spray once every 5-7 days, spray 3-4 times.
Second, downy mildew
1. When the symptoms of the disease are mainly harmful to the leaves and the leaves of 9 to 10 Chinese cabbage seedlings, the number of diseased plants rapidly increases, and the disease condition gradually increases from light to light. After the seedlings became infected, a layer of white frost fungus appeared on the back of the leaves. In the case of adult disease, there was a layer of white mold on the back of the leaf, and a small, pale, green, spot-like lesion appeared on the surface of the leaf, which was light brown after expansion. When the disease was heavy, the leaves became yellow and dry. The victim leaves develop from the outer leaves of the plant to the inner leaves. Serious damage can not be covered.
2. Transmission routes and disease conditions The sporangia that grow on the lesions spread through the wind and rain, invade the epidermis and stomata of the plants, and cause morbidity. The onset temperature is about 16°C. Large temperature difference between day and night, after the rain, fog, there is exposure, when the humidity in the field is easy to disease.
3. Control methods 1 selection of disease-resistant varieties. Such as Feng Kang 78, Feng Kang 80, Beijing-75 Shandong No. 4, and so on. 2 appropriate sowing, to 3-5 days before and after the beginning of autumn is appropriate. 3 timely prevention and treatment. Immediately after the detection of the diseased plants, use 25% metalaxyl wettable powder 800 times, or 70% mancozeb zinc wettable powder 500 times, or 75% chlorothalonil wettable powder 500 times, spray per acre. Liquid 50 kg.
Third, dry disease
1. The onset of symptoms occurs mainly in the heart and leaves. At the beginning of the disease, the young leaves of the inner leaves show a greenish-yellowish color at the front and then gradually darken. They eventually turn into dark brown dry paper; when they are severe, they cannot form leafballs, and they are rotted when they rain. smell. The mildly ill can pack and have a normal appearance, so it is also called a "dry heart."
2. Incidence conditions This disease is a physiological calcium deficiency disease, and it is a relatively serious physiological disease in Chinese cabbage in recent years. Drought during the seedling stage is prone to this disease.
3. Control methods 1 Strengthen field management. To prevent the drought of cabbage seedlings and rosettes, timely watering. 2 chemical control. Spray calcium naphthalene alcohol mixture before the ball (5 grams of calcium chloride per kilogram, 50 milligrams of naphthaleneacetic acid, 0.5 milligrams of triacontanol), 50-75 kilograms per acre, spray once every 10 days, and even spray 2 Times. Can also be at the beginning of the disease, spray 25% thioredoxin 800 times, or 58% of methyl methosulfate 500 times, every 7-8 days spray 1, even spray 2-3 times.
Fourth, soft rot
1. Onset Symptoms Soft rot usually develops on the ball stage. At the time of initial onset, the outer leaves were wilting, the leaf bulbs were bare, and they were easily taken off. The stems rotted and stinked and the whole plant died.
2. Onset conditions The optimal temperature is 27-30°C. When the ground temperature is high, it is rainy, and it is wet, it is the most susceptible to disease and epidemic.
3. Prevention and control methods 1 Strengthen cultivation and field management, change the cultivation of flat rice to ridge cultivation, find the diseased plants in a timely manner, and open a hole to apply lime, apply 250 grams per hole. 2 timely pest control. Dip or spray with 90% trichlorfon 800-1000 times. 3 chemical control. At the beginning of the disease, spray with 0.01%-0.015% of agricultural streptomycin, 4000 times of neomycin, or 77% can kill WP of 600-800 kg per kilogram of water, every 7-10 Sprayed once a day, sprayed 2-3 times. When spraying, it is necessary to spray the diseased plants and the surrounding bases of the diseased plants and the surface of the soil so that the medicinal liquid will have a better control effect when it is poured into the cabbage.