Prevention and treatment of scab of mango
1. Characteristics of symptoms
It mainly harms the fruit, and young shoots and leaves can also be damaged. All the affected parts showed rough and slightly raised scab spots. The fruit face appears dark brown cork slightly raised small spot, after the disease spot is dense and connected with synthetic plaque, the spot is rough, the center is sunken or star-shaped crack, severe pericarp cracking. Seriously ill new leaves can be deformed and twisted, easy to fall early. The cortex of the injured shoot was rough or dehiscent or withered. Gray mildew spots appear in the affected part when it is damp.
2. Pathogen and characteristics of the disease.
The pathogen is SphacelomamangiferaeBit.etJen. The pathogen survived the winter with the disease residue of mycelium and conidium in the diseased plant and residual soil, and carried out the initial invasion and re-invasion by the transmission of conidia by wind and rain. The long-distance transmission of the disease is mainly through the transportation of diseased seedlings. Seeds can also spread disease. The disease is more common in warm and rainy years, especially in the weather with large temperature difference between day and night and high humidity. Near-mature fruits are susceptible to disease. The shoot of young leaf of seedling is more common than that of adult fruiting tree.
3. Prevention and control methods
(1) to carry out quarantine, and as soon as imported diseased seedlings are found, they should be burned immediately. (2) combined with pruning, remove diseased branches and leaves and burn them. (3) timely spraying to protect shoots and fruits. The nursery is mainly to protect the shoot leaves, and the fruit garden is mainly to protect the fruit. Alternately spray 12 Bordeaux solution, 30% copper oxychloride + 70% topzine (1:1) 1000 times, 40% polysulfide glue suspension solution, 50% mixed sulfuric acid solution 3 times 5 times during shoot stage and fruit expansion to 15-20 days before fruit harvest.
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Control of citrus fruit fly (Bactrocera citri)
(1)Harm is also known as orange fruit fly, mango fruit fly, fruit maggot, yellow fly and so on. Adult eggs lay in the epidermis of nearly mature fruits. After hatching, larvae feed on the flesh, causing fruit cracking, fruit rot and fruit drop. The damaged fruit surface is intact, and there are wormholes when you look closely. There is juice flowing out by hand, and it is cut open.
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Control of the disease of mango leaf hopper
Mango flat beak leafhopper, also known as leaf hopper, damages flowers and young fruits, resulting in flower and fruit drop, poor harvest or even loss of harvest, and induces serious soot disease, but also damages young buds, tender shoots and leaves, resulting in bud and leaf deformity. Usually occurs more during flowering, humidity is high, trees
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