What are the common diseases and insect pests of pomelo?
What are the common diseases and insect pests of pomelo? How to prevent and cure it? Please introduce the following common diseases and insect pests of pomelo and their control methods: first, the main diseases of pomelo are Huanglong disease, canker, scab and anthrax. Canker does serious harm to pomelo. Canker is caused by bacteria, which mainly invades new shoots, tender leaves and young fruits, forming canker spots with nearly round, corky, rough surface, yellowish brown and a diameter of 0.3-0.5 cm, causing falling leaves and fruit, affecting growth and yield, and reducing the appearance and internal quality of the fruit. The prevention and control methods are mainly prevention, comprehensive treatment, strict quarantine system, establishment of disease-free mother garden, ear harvest garden and seedling base to prevent diseased seedlings from coming out of the nursery. Comprehensive measures were taken to prevent and cure the disease in the garden. 1. Clear the garden thoroughly. After harvest, cut off the diseased branches and leaves, clean up the diseased fruit and burn it on the spot. After clearing the garden, stone-sulfur mixture was sprayed comprehensively to eliminate the source of overwintering disease. 2. Timely control of infectious pests in each shoot period. Such as leaf miner and malignant leaf worm and so on. 3. Spray the medicine every 10, 30 and 50 days after the top of the new shoot is exposed (before cutting) and after flower fade. The optional drugs are 1: 100 Bordeaux solution, 6-1000 units of agricultural streptomycin plus 1% ethanol solution per milliliter, 50% Dysen zinc aqueous solution, 50% antiseptic special powder, etc. 2. The main pests of pomelo include red spider, rust wall lice and other mites, scale such as sagittal tip scale, brown round scale, citrus leaf moth, gibbous insects and so on. Mites control methods: 73% propargite EC 2000-4000 times, 50% triazolyclotin 1500-2000 times, 20% triclofenac EC 1000 times, 20% fenvalerate EC 3000 times 1-2 times. Citrus leaf miner can start spraying 2500-3000 times of 25% deltamethrin or 1000 times of isocarbophos every 5-10 days when most new shoots grow to 0.5-1.0cm. In the peak period of adult Eclosion, the dead bark of the trunk can be scraped off, and the injured area can be coated with 1:1 dimethoate EC and kerosene. During the peak period of adult emergence, the tree crown can be sprayed with 1000 times of 80% dichlorvos EC or 1000-1500 times of 90% trichlorfon EC. Click to get more pomelo planting techniques click to get more fruit planting techniques
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How to manage red meat honey pomelo in spring?
How to manage red meat honey pomelo in spring? Please guide that spring is the early stage of red flesh honey pomelo hair root, periwinkle, flower spike, flowering and young fruit. this period, such as disease and insect damage, lack of fertilizer and drought, has a direct impact on the strong shoot, strong flower and fruit setting rate of pomelo trees, and is the key period to increase the yield of the same year. It must be taken in due course.
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What is pineapple black heart disease? How to prevent and cure
What is pineapple black heart disease? How to prevent and cure? Please point out that the black heart disease of pineapple is one of the main diseases of pineapple, which mainly harms the fruit, affects the fruit quality in light cases, and loses the commercial value in serious cases. Symptoms: the disease mainly harms mature fruits. There are two kinds of symptoms: one is that the small fruit turns brown or forms.
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