Radish virus disease is a common disease, what are the characteristics of radish virus disease

It can occur throughout the growth period, and after the radish leaves are damaged, the irregular greenish yellow spots appear at first, and then gradually expand into polygonal yellow-brown lesions, and the disease extends from the lower part of the plant to the upper part. When the humidity is high, the back of the leaf or the two sides of the leaf out of frosty white mold, when the disease occurs severely, the disease spots are connected into a piece, one is in addition to the pesticide The second is to burn some plant ash and sprinkle it on the radish leaves in the morning, because the radish leaves have dew in the morning, and it is easy not to fall ash. Third, buy some lime powder and sprinkle it on radish leaves, so that if you sprinkle it a few more times, the pests and diseases will be completely gone.

Underground pests are, yellow-striped jumping beetle larvae, ground tigers, etc., underground pests have many species, miscellaneous, long occurrence period, especially in spring and autumn, and the concealment is strong, it is a kind of pest that is difficult to control. Downy mildew is a fungal disease, which can be controlled by downy mildew net, downy urea, manganese-zinc, downy mildew and other agents. Other fungal diseases can be treated with pyraclostrobin, pyrazoledesen, pyricosidin, and polyantimycin according to the occurrence situation.

Radish seedlings are mainly used to control yellow koji jumping beetles and cabbage insects, boron and calcium fertilizer should be sufficient in the growth process, especially can not lack boron fertilizer, boron deficiency is easy to lead to radish hollow, black heart, fruit bran, and poor storage tolerance. Withered. Germs prefer warm, high humidity conditions.

Especially in autumn, it is rainy, high humidity, the temperature difference between day and night is large, foggy and dewy, and the disease is easy to spread. In the process of planting, the incidence of continuous cropping, low-lying plots, excessive planting density, and weak growth was more serious. Downy mildew of radish mainly affects leaves.

The onset begins on the outer leaves, with small spots on the leaf surface that are pale green to pale yellow, enlarged and yellowish-brown, and are polygonal due to the restriction of leaf veins. White mold appears on the back of the leaf when wet, and the outer leaf dies in severe cases.

To prevent pests and diseases, we must first take agricultural measures, apply foot fertilizer, base fertilizer to well-rotted organic fertilizer, microbial fertilizer, balanced use of phosphorus and potassium fertilizer, for the spread of soil-borne diseases, soil disinfection can be carried out, so as to create an environment that is not conducive to the survival of pest eggs; In the planting process, it is necessary to remove the fallen leaves of the vegetable field in time.

For example, there are often yellowing of the leaves, or some mottled leaves, or the size of the radish is very small, or there will be stunted development and improper color.

Radish virus disease is a disease that occurs in radishes caused by turnip mosaic virus, cucumber mosaic virus, tobacco mosaic virus, etc. It mainly damages leaves, and can be diseased from seedling stage to late adult stage. In most cases, the whole plant is affected, with uneven chlorophyll on the leaves, dark green and light green mosaic symptoms, sometimes deformed, and sometimes ear-like protrusions along the leaf veins.

The prevention and control methods of radish virus disease mainly include strict selection of non-cruciferous vegetables in continuous cropping and planting; select disease-resistant and disease-resistant varieties and sow seeds in a timely manner; strengthen the management of fertilizer and hydroponics; Pay attention to the prevention and control of aphids and yellow bending beetles to prevent virus infection. In the early stage of the disease, it can also be treated with chemical sprays, spraying once every 5-7 days, 2-3 times in a row.

Virus-infected radishes begin to have new leaves in the shape of light green mosaic leaves, and the diseased leaves gradually turn yellow, shrivel, and grow poorly. If it is infested at a young age, the plant will shrink and the roots will swell. The virus disease is mainly transmitted by pests such as aphids. Occurs heavier in autumn.

The leaves of susceptible radish showed mottled flowers and leaves with dark green and light green, and the leaves were slightly shrunken, and the severely diseased plants appeared with flowering leaves and herpes leaves. If the seed is damaged, the plant will be dwarfed, but the deformity will rarely appear, which will affect the number of pods and the fullness of the pods. Before planting, the soil was first applied with organic fertilizer biological fertilizer + potassium sulfate compound fertilizer, and according to the average standard fertilizer amount of 667 square meters, 4 bags of organic fertilizer + 4 bags of biological fertilizer + 12 kg of potassium sulfate compound fertilizer.

It can be planted in all seasons, but it is not tolerant to high temperature and extreme cold, and if it is planted on the scale of facility agriculture, it can produce considerable economic benefits; Therefore, cherry radish, as an economic agricultural product, has played a great role in enriching the production of off-season vegetables. Autumn sowing is late, autumn and winter cultivation should be timely late sowing to avoid high temperature, drought season, and sowing in the cold and cool season when the disease is not suitable can reduce the occurrence of disease. Cherry radish is a semi-hardy vegetable.

The suitable temperature range for growth is 5 25 . The suitable temperature of seed germination is 20 25, the suitable temperature of growth is about 20, and the growth is slow below 6, which is easy to pass through the vernalization stage, resulting in unripe sprouting.

Radish virus disease is caused by turnip mosaic virus, cucumber mosaic virus, radish ear mosaic virus, etc., and can be affected from the seedling stage to the adult plant stage. The heart leaves of the affected radish and mildly diseased plants showed bright veins and shrunken, showing a mosaic and leaf-shaped shape, although there was no obvious dwarfing phenomenon, but the growth was poor. The leaves of the seriously diseased plants are seriously deformed and dwarfed, resulting in losses.

The probability of disease in the future will be much lower after seed dressing, and the soil will be dry and wet during the planting process. In addition, it is drug prevention and control, the drug can be sprayed with manganese zinc in Sadezeb, and the dosage of the drug should be paid attention to to avoid the damage of cherry radish.

In the process of planting cherry radish, sometimes viral diseases occur, which are generally caused by turnip mosaic virus and cucumber mosaic virus infection.

Pesticides should be sprayed in a timely manner, and soil loosening should also be carried out, and water and fertilization should be done in a timely manner to manage water and fertilizer.

I think the harm of radish virus disease is very great, if we want to better prevent and control this radish virus disease, we should take corresponding measures in advance, use scientific methods, and spray the surface of radish with corresponding drugs.

Pesticides. Because my radish has not been infected with viral disease since being sprayed with pesticides, it should be treated with pesticides to prevent and control it.

If the onset is delayed, the heart lobes show bright veins, or the flowers and leaves are mottled and wrinkled.

Pathogen and pathogenesis] The pathogen is a virus. The main sources of toxicity are turnip mosaic virus (TUMV), cucumber mosaic virus (CMV), radish ear mosaic virus (REV), etc. In particular, the compound infection of turnip mosaic virus and other viruses accounted for a large proportion (more than 50), followed by the proportion of turnip mosaic virus alone infection (about 30), although the situation was different in different places, but the general trend was basically the same.

All three viruses can be transmitted through insect vectors and saps. The vectors of turnip and cucumber mosaic viruses were radish aphid, peach aphid, etc.; The vectors of radish ear mosaic virus were yellow-striped jumping beetle and cucumber 11 star leaf beetle. Any weather or ecological environment conditions that are conducive to the reproduction and activity of vectors are conducive to the occurrence of the disease, especially in high temperature and drought years or seasons, and the disease is often prone to epidemics.

Disease resistance varies among varieties. Among the 42 radish varieties promoted in China in recent years, the radish varieties of the general hybrid generation are more resistant to disease than the conventional varieties. The varieties with high resistance were Zhejiang Radish No. 1 (high resistance to turnip mosaic virus) and Xiaoying Zihua Weixian radish (endemic species of Weixian County, Shandong, with high resistance to virus and black rot).

Those who showed disease resistance included the Fengke generation (Shanxi); Volakang radish (Southwest Agricultural University); Mantang Hongxinmei 91-1 (anti-turnip mosaic virus, Beijing Academy of Agriculture and Forestry Sciences); Hot White (Beijing Agricultural University); Hongfeng No. 1, Hongfeng No. 2 (Shenyang); Yu Radish No. 1 (Henan); dry carrot (Nanjing landrace), etc. Those who are susceptible to diseases include Weiqing (Tianjin); Huangzhou radish (endemic species of Huangzhou, Hubei). In addition, the occurrence of Hefei green radish (Anhui) virus disease is also light.

Prevention and control methods] refer to the prevention and control methods of cabbage virus diseases. On the basis of selecting disease-resistant varieties according to local conditions, we should pay special attention to the control links such as insect control (aphids and yellow-striped jumping beetles, etc.) and timely spraying of foliar nutrients + black soap (or soap).

If there is no doubt that it is a virus, you can find this spray several times.

The virus loss temperature is 55-60, the dilution endpoint is 2000-5000 times, the virus retention period in vitro is 24-96 hours, and the particles are linear. The incubation period is 9-14 days. Generally, the temperature is about 25, the light time is long, and the incubation period is short; The temperature is lower than 15, the incubation period is long, and sometimes it is a hidden phenomenon.

The virus can overwinter on cabbage, cabbage, radish and other seed plants, and can also overwinter in the roots of root crops such as spinach and host weeds at the edge of the field, and the virus does not have the problem of overwintering in areas where cruciferous vegetables grow all year round.

Turnip mosaic virus and cucumber mosaic virus are transmitted by contact with aphids and sap, but the main ones transmitted in the field are aphids (cabbage tube aphid, peach aphid, cabbage aphid, cotton aphid), and the seeds are not poisonous. Tobacco mosaic virus aphids cannot be transmitted and are mainly transmitted by contact with sap in the field. Chinese cabbage has a very narrow range of temperature adaptation, and the suitable temperature for growth is 18-21, and 25 is the upper limit of temperature.