Chemical control of heart rot of pineapple
The disease is mainly harmful to seedlings and can also be used in adult plants. At the initial stage of the damaged plant, the leaves were still green, only the leaves were slightly dark and dull, and the heart leaves were yellow and white. Since then, the leaf color has gradually changed to yellow or reddish yellow, the leaf tip has dried up, and the base of the leaf has a water-stained rotten surface. The main feature of the disease is that the core leaf can be pulled up easily. Prevention and control methods: when planting, the wound should be dried before planting. The seedlings can be soaked in 25% carbendazim 800-1000 times solution for 10 minutes for 15 minutes, and then planted after drying. For the diseased orchard, 25% carbendazim 1000-1500 times or 70% methyl topiramate 1000-1500 times can be sprayed.
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Introduction to the symptoms of grape downy mildew
Symptom recognition: it is a fungal disease, mainly harmful to leaves, new shoots and young fruits. The injured part of the leaf first produces a yellowish brown water-immersed spot with an unclear edge, which gradually expands into an irregular or slightly round yellow brown spot with a diameter of 1 cm to 3 cm. The boundary of the lesion is unclear, and multiple spots can be connected into large spots and wet.
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Control methods of pineapple heart rot
The disease is mainly harmful to seedlings and can also be used in adult plants. At the initial stage of the damaged plant, the leaves were still green, only the leaves were slightly dark and dull, and the heart leaves were yellow and white. Since then, the leaf color has gradually changed to yellow or reddish yellow, the leaf tip has dried up, and the base of the leaf has a water-stained rotten surface. The main feature of the disease is that the core leaf can be pulled up easily. ...
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