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Many cucumber growers now use black-skin squash as rootstock for grafting cucumbers in order to increase the disease resistance and cold resistance of cucumbers and increase the yield of cucumbers. Recently, Zhang Aimin vegetable farmers in Zhangdeng Township, Qingyuan County, reported that he planted cucumber seedlings in 5 acres of land in September this year. All of them were grafted with black-skinned squash. Now they are not resistant to disease, and more than half of all melon seedlings are dead. Now. How do grafted cucumber seedlings die? Dai Suying, a researcher at the Provincial Academy of Agricultural Sciences, has a new comment on this phenomenon. Dai Suying, a researcher, said that practice has shown that grafting cucumbers with black-skinned squash as rootstocks can indeed play a role in disease resistance and cold-resistance, but it does not mean that as long as grafting is completed, it will no longer cause disease. There are three main reasons for the death of grafted cucumber seedlings: one is the pest and disease, the other is that the grafting technology is not standardized, and the third is that the improper management leads to wilting and death. The wilting caused by pests and diseases is mainly caused by bacterial infection, fungal infection or damage by underground nematodes. Bacteria-infected grafted seedlings showed dark green wilting in the early stages of disease. The whole plant died shortly afterwards. The cross-section of the vascular bundle by hand squeezed the white pus and the catheter did not change color. The grafted seedlings after fungal infection began to show wilting at noon and could recover sooner or later. After several days of repeated death, the vascular bundles of the diseased stems above the grafted interface did not brown, and there was no contracture at the stem base. In some old vegetable areas, root-knot nematodes are generally more serious, and they mainly invade new roots of papaya. After the roots of the melon were killed, they often induced some pathogens such as Fusarium to infect the soil, accelerated the root rot, and affected the normal absorption after root damage. The growth of the shoots was hindered, showing slow growth and short plants. At noon the temperature is high, transpiration is strong, watering is sufficient or the temperature is low in the morning and at night can return to normal. After repeated several times, the plant gradually withers. To prevent dead seedlings caused by pests and infestations, it is best to implement rotation cropping. It is impractical to carry out soil disinfection prior to planting to reduce the number of pathogenic bacteria. In the event of wilting, immediately irrigated with 72% of Streptomycin WP 4,000 times or chlorothalonil aerosol; the nematode can be used for deep ploughing and flooding, turning the soil deeper. Centimeter, and then flooding, so that the area of ​​10 cm deep water, keep for 3 days, can effectively kill nematodes. Normative grafting technology is also the key to the success of grafting. As the melon seedlings grow fast, they must first sow the cucumber seeds and sow the black seed squash 5 to 6 days later. When they are grafted, the two are more uniform in size and easier to graft and survive; the grafting period is suitable for the two leaves of the papaya and the cucumber seedlings. When the true leaf length is about 2 cm, the seedling age should not be too large; the grafting method should be used for grafting; the incision should not be too shallow when grafting, and 2/3 of the stem diameter should be good, and no gap can be left in the incision, otherwise the wound healing will be affected. The grafted seedlings are withered; the grafted seedlings are not planted too deep so as not to exceed the grafted junction. If the soil is buried in the interface, the knife edge is easily infected by the bacteria in the soil, resulting in dead seedlings. Improper management also results in the death of grafted seedlings. Can not be flooded with water after grafting irrigation, water immersed knife edge caused by soil-borne bacteria infection, or cause root suffocation, in anaerobic conditions produce toxic substances, so that root poisoning leads to wilting, it is best to use drip irrigation under the membrane. After 4 to 5 days after grafting, the seedlings should be irrigated once. Afterwards, they should not be watered, and the seedlings should be properly planted. After grafting, the temperature of the shed is required to be high. The temperature is maintained at 28°C to 30°C during the day and the night temperature is 16°C to 18°C. The air humidity requirement for the first 3 days after grafting is above 90% and no light is visible. Grafting can gradually uncover the grasshopper after seeing light, and reduce the air humidity to 60% to 65%.