What is pineapple mealybug wilt disease, and how should it be prevented and controlled?
What is pineapple mealybug wilt disease? How should it be prevented and controlled? Please provide guidance. Pineapple mealybug wilt disease is also known as pineapple root rot. For prevention and control methods, you can refer to the following: 1. Symptoms. Above ground, in the early stage of the disease, the basal leaves turn yellow and red, shrivel, and lose their gloss, and the leaf margins curl inward; later the leaf tips dry up, the leaves wilt, and the plant stops...
What is pineapple mealybug wilt disease? How should it be prevented and controlled? Please provide guidance.
Pineapple mealybug wilt disease is also known as pineapple root rot. For prevention and control methods, you can refer to the following:
1. Symptoms. Above ground, in the early stage of the disease, the basal leaves turn yellow and red, shrivel, and lose their gloss, and the leaf margins curl inward; later the leaf tips dry up, the leaves wilt, and the plant stops growing. As the disease progresses, rot spreads from the root tips until part or all of the root system rots, and the plant dies. Most people believe the disease is caused by a virus transmitted by the pineapple mealybug.
2. Conditions for disease occurrence. ① Climatic factors. It generally occurs easily in hot, dry autumn and winter, but is also commonly seen in low-temperature, rainy spring. In Hainan Province it mostly occurs from November to January-February of the following year. ② Plant growth factors. Generally, plots with vigorous plant growth, relatively high fertilizer and water management levels, and excessive close planting are prone to the disease, and it is more severe. ③ Environmental condition factors. In hillside depressions where water accumulates easily, on steep hillsides with severe soil erosion, where roots are exposed, and in sandy soil with poor water-holding capacity, the root system is prone to dying and wilting. ④ Underground pest factors. Pests such as white grubs, termites, and earthworms that feed on the underground roots can aggravate the occurrence of wilt disease.
3. Prevention and control techniques. ① Strictly select disease-free, vigorous seedlings. Do not select or introduce seeds from diseased areas or diseased fields. If introducing seeds from diseased areas, the base of the seedling rhizome must be strictly soaked in the medicinal solution for 2 minutes, and placed upside down on its side so that the solution accumulates at the leaf base to kill the mealybugs remaining in the seedlings; after drying, plant them. For soaking seedlings, you can use 50% malathion emulsifiable concentrate at 800 times dilution, 40% dimethoate at 800-1000 times dilution, or 80% dichlorvos emulsifiable concentrate at 1000 times dilution. ② Medicinal and fertilizer treatment. When diseased plants are found, the above pesticides can be promptly mixed with 50% thiophanate-methyl wettable powder at 400 times dilution and 1%-2% urea and sprayed to promote yellow leaves turning green. The soil surface at the base of plants around the diseased plants and other healthy plants must be drenched with one of the above insecticides to control mealybugs and underground pests. ③ Improve the plantation environment. Pay attention to selecting plantation sites. Strengthen management. Use high-ridge planting to avoid water accumulation and soil erosion in the orchard. For kaolin soil and heavy clay soil, increase the application of organic fertilizer to improve soil aeration and promote root growth, and promptly dig out and burn diseased plants.
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