Cucumber green mottle mosaic virus disease is a devastating disease of Cucurbitaceae crops. At present, during the critical period of sowing, seedling and grafting of melon, all localities must seize the prevention and control points and implement preventive measures to lay a good foundation for the production of western melons throughout the year.
It is understood that since 2011, some watermelon plantations in our province have been diagnosed with cucumber green mottle mosaic virus disease, the loss of the base of the disease is more than 30%, serious or even closed, and there is a tendency to increase the spread, the loss of melon farmers is greater , affecting the healthy development of the melon industry. Through investigation and investigation, the agricultural department of our province organized relevant experts to discuss and discuss, and put forward "emphasis on ensuring that technology is in place, focusing on prevention, grasping the two sources of seeds and seedlings, and resolutely eliminating the purchase of poisonous watermelons and rootstock seeds. It is strictly forbidden to export seedlings in epidemic areas. Large-scale production households should do a good job in soil disinfection, pruning, pest control, and control of the diseased fields for more than 3 years
1, the onset of symptoms
Cucumber green mottle mosaic virus disease can occur in both plant seedlings and adult plants. The early infected watermelon plants grew slowly, with irregular fading or light yellow leaves, the green part protruding the surface, the leaf surface was uneven, the leaf edge was rolled up, and then the green plaque appeared, which was relieved with the aging symptoms of the leaves; The diseased vines grow stagnant and wilting. When severe, the whole plant turns yellow and cannot grow normally and die. The brown nectar stripes often appear on the fruit stems, and the surface of the fruit has inconspicuous green round spots, sometimes growing dark green tumors that are not very obvious. Blister. Compared with normal watermelon, the diseased fruit is elastic, and the sound is blunt when slap. The flesh around the flesh is yellow water-stained, with blocky yellow fiber inside. The flesh is fibrotic, and the flesh around the seed turns purple or dark red water stain. The ripe fruit flesh turns into dark red, and there are a lot of voids inside. Loofah scorpion, commonly known as "blood flesh", can not be eaten bitter, lose economic value.
2, the transmission route
Cucumber green mottle mosaic virus disease is mainly transmitted by seed infection and contact infection. Grafting, field operation, soil continuous poisoning, etc. can be transmitted, and the virus can survive for more than one year in the soil.
According to the investigation and analysis, the seeds of the poisoned watermelon rootstock were purchased as the source of infection in the province, and the intensive grafting and seedlings were sold, and the grafted seedlings were transported and spread. Some seedlings in the old watermelon producing areas were grafted, grafted and pruned. Factors such as farming operations and soil poisoning in continuous crops have intensified the spread of the disease.
3, prevention and control measures
(1) Control the source to curb the spread. It is strictly forbidden to sell and sell poisonous seeds, and it is strictly forbidden to export sick seeds. Rootstock seeds and watermelon seeds with dry heat-treated labels should be purchased, and quarantine certificates should be requested; test seeds that have not been sterilized by dry heat treatment are not provided at random. The growers do not randomly test seeds of unknown origin, and try to isolate the test plots. .
(2) Cultivate disease-free and strong seedlings. Seed disinfection must be carried out before sowing (cleaning with 10% trisodium phosphite for 10 minutes). The tools used for grafting should be completely disinfected (steam fumigation, or disinfected with 40% formalin 100 times solution) to avoid contact with infection. The diseased seedlings were found to be promptly sent for inspection, and they were destroyed after confirmation. The unqualified seedlings did not leave, ensuring that no poisonous seedlings entered the field. Carefully cultivate strong seedlings and improve the disease resistance of seedlings.
(3) Pay attention to crop rotation and soil treatment. The watermelon field should choose the area where the surrounding fields have no disease and the upstream water source is clean. The diseased field was carried out for more than three years of rotation or water and drought rotation. For the field that has a mild incidence in the previous year and needs to be continuously cropped, it is necessary to do a good job in soil disinfection. The soil can be treated with 100-150 kg of quicklime or 25 kg of lime nitrogen per acre.
(4) Strengthen cultivation management. Through agronomic measures, create suitable temperature and humidity conditions for the growth of watermelon, increase the application of phosphorus and potassium fertilizer, micro-fertilizer, and spray zinc sulphate on the leaf surface to enhance plant resistance; find that the diseased plants should be removed in time and destroyed centrally; pruning, topping, Farming operations such as pollination and fruit picking should prevent human cross-infection and spread the virus.
(5) Do a good job in chemical control. Anti-viral agents are sprayed for prevention and treatment after colonization or early onset. In the early stage of the disease, it can spray 5% bacteria toxic WP 300 times solution, 7.5% bactericidal morpholine water repellency 700-800 times solution, 30% morpholinium hydrochloride, copper WP 500 times solution, or plant Virus deactivating agent 912, soaked in 75g per acre and 1kg of boiling water for 12 hours, stir well, add 15 kg of water to spray.
Total 1 | <First <Prev 1 Next> Last> |
share to:
New Generation Flooring,the future development trend of the Laminate Flooring industry.
our Waterproof Laminate Flooring, which is a new generation of floor. Black HDF boards, with the Atomic hydrogen and high density, is resistant to moisture.
With their waterproof construction and leading hardwood designs, it is an ideal flooring options for any room - even bathrooms, kitchens and mudrooms.
Hand Scraped Laminate Flooring,Beautiful High Glossy Collection Floor,U-Groove Laminate Flooring,High Glossy Laminate Floor
Shenyang Rongdida Wood Industry Co., Ltd. , https://www.rddfloor.com