The root-knot nematode disease of bayberry is caused by nursery households often raising seedlings in the area where they are used as seedbeds or root-knot nematodes. There are obvious nodular processes on the roots of common seedlings. With the introduction or planting of diseased seedlings for 6 to 7 years, they will begin to wilt from the tender shoots of red bayberry, the leaves will turn yellow, the shoots will grow black from top to bottom, and further develop to the onset or death of the entire tree. The bayberry will also have an epidemic. Examining the root system, we can see that the root nodule is protuberant, and sometimes the transmitting tissues are black and even flow “black waterâ€. Root-knot nematodes are mainly distributed in 20 cm of top soil, with a maximum of 3 to 10 cm. When the larva is 2 years old, it invades from the root tip or the young part of the root tip, first parasitizes in the root cortex, re-infects between the root cortex and the middle column, and then turns into the medullary canal of the root. After the nematode invades, it stimulates the excessive growth of the root cell tissue to form giant cells, resulting in root knots of varying sizes; and due to the activity of nematodes, the symbiotic mycorrhiza cannot form or rarely form nodules. After the mycorrhizal activity is blocked, the nitrogen fixation capacity is weakened, and the bayberry tree body does not receive the necessary nutrient supply and the growth is affected. To control root-knot nematode disease of bayberry, it is necessary to comprehensively use the following seven technical measures: First, the selection of disease-free seedlings, strict quarantine, to prevent diseased seedlings into the no-disease area and protect the new area. Second, plant disease-resistant varieties, a reasonable rotation. Different varieties have different disease resistance; the cultivation of the same species will be prolonged and the disease will increase year by year. Root-knot nematode disease is a contagious disease. It must be used as a seeding seedling for the land of a rice field or a grass crop. If the root-knot nematode disease of the introduced bayberry seedlings is found to have died, it shall be removed from the garden to prevent infection; if the introduced red bayberry seedlings are planted after their death, they should not be planted in the same location. If they are planted in the same place, they should be planted. Six months after disinfecting with lime, replace with fresh soil. Third, warm soup processing. The diseased seedlings were immersed in a constant temperature hot water at 48°C for 15 minutes to kill the nematodes in the roots and roots. Fourth, improve the soil. The soil pH values ​​of normal and mild disease trees were 5.2-5.3, and the soil pH of severe disease trees was 5.0 or less. The use of lime to adjust the pH of diseased trees can reduce the speed of disease development. Soft soil, high organic matter content, sandy red soil or yellow loam containing gravel, suitable for Mycorrhizae mycorrhizal growth, can inhibit the occurrence of Myrica rubra root knot nematode disease hazards. Fifth, strengthen fertilizer and water management. The drainage conditions in planting areas are good, which is not conducive to the spread of nematodes; the drainage conditions are poor, and flooding in the flood season is very conducive to the nematode spreading and infecting with the water stream. Appropriate organic fertilizers are added to increase tree vigor and reduce disease. Before harvest, 90ml of Fuquan HB-101 stock solution (1000m2 area with 100ml) per acre is diluted with water 1000-10000 times to irrigate soil 2 times per month; then 100ml of original solution is diluted 1000-10000 times. Face, 2 times a month. In half a year after the harvest, 90 ml of the Fuquan HB-101 stock solution (100 ml in an area of ​​1000 square meters) was diluted with water and sprayed to the soil once a month. Six, chemical control. 50% phoxim EC 800 times or 1.8% avermectin EC 2000～3000 times, spray irrigation soil; use 22.5～45.0 kg 50% phoxim EC per 15 mus, mix in organic fertilizer, apply to soil Or, after spreading poisonous soil, turn it into a 3 to 10 cm deep soil. VII. Biological control. The foreign developed "BIO-CON" fungal fungicide Paecilomyces was used to control root-knot nematodes and the effect was very good.
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