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After the onset of wilt disease plants, the leaves became soft and drooping, the leaves were pale green to red, the base rotted, and the whole plant died. The disease is caused by whitefly insecticide. Control methods: First of all, strict attention should be paid to breeding without diseased seedlings. Secondly, the whitefly insects were extinguished in a timely manner. When the plants were planted, they were soaked in 500-fold dimethoate solution and planted by inverting and drying. After the species was found to be a cause of whitefly insecticide, 500 times dimethoate spray in time, or 25% Zhongkemei 1500 times liquid. If a diseased plant is found, remove it in time to prevent the spread. Black rot suffers from blackened fruit and gradually expands to rot in the whole fruit. The pathogens are invaded by the stalk wounds at the buds and fruit picking. Control methods: Be careful not to top and pick fruit in rainy days to reduce the chance of germ invasion. This disease is also a major disease in the storage of fresh pineapple fruit. Miao heart rot disease seedlings die. Mainly caused by the accumulation of heat or water. Control methods: Avoid seedlings piled up too long, especially in the long-distance transport process should be minimized to long stacking, so as to avoid fever, injury due to high temperature, high humidity and airtight seedlings. Transport to the destination will be spread out, lightly planted after 1 to 2 days, avoid planting on rainy days, pay attention to deep cultivation of shallow species. When the fruit is ripe, it is bitten by the big-headed cricket and it will make the fruit poor quality and it will become an out-of-grade fruit. Control methods: use rice bran 5 kg fried sweet potato 1 kg transferred to a small amount of pickle juice, plus 90% crystal trichlorfon 100 grams, made of bean size bait, in the evening will poison bait spread around the plant to kill.