(1) Mango coal pollution disease:
Linyi Fertilizer Network Copyright
1. Symptoms: The disease mainly occurs on leaves and fruits. The surface of the leaves and fruits is covered with a layer of black fluff, like soot, so it is called soot. In severe cases, the entire leaves and fruits are covered by mycelium (soot). These fungi grow mainly on the surface of the leaves, are not easily invaded into the leaf tissue, and are easily rubbed off. Linyi Fertilizer Network Copyright
Linyi Fertilizer Network Copyright
2. Pathogens and occurrence regularity: The pathogen of this disease is called CapnodiummangiferaeP.Henn. The main bacteria are mainly honeydew secreted by aphids and leaf aphids. Aphids and leaf axils occur frequently, and soot disease is also serious. The pathogen is so wet that the mango is planted too densely and the shade is easy to develop. Linyi Fertilizer Network Copyright
Linyi Fertilizer Network Copyright
3. Prevention and treatment methods: Prevention and control of aphids and spider mites are effective methods to prevent the occurrence of this disease. After the onset of the disease, it can be sprayed with 0.3 wave of sulphur sulphur mixture and dithiocarbamate. Linyi Fertilizer Network Copyright
Linyi Fertilizer Network Copyright
(2) Mango algal spot disease: Linyi Fertilizer Network Copyright
Linyi Fertilizer Network Copyright
1. Symptoms: The disease mainly occurs on the leaves, and both sides of the leaves can occur on both sides. The small white dots of the primary white to pale yellowish brown needles gradually expand radially around, forming a round or irregular shape with slightly raised felt-like spots, and the edges are not neat, gray-green or orange-yellow. The surface is smoother and the color is darker. Linyi Fertilizer Network Copyright
Linyi Fertilizer Network Copyright
2. Pathogens and occurrence regularity: The pathogen of this disease is Cephaleurosvirescens Linyi Fertilizer Network Copyright
Kunze, the orchard has thin soil, overgrown weeds, low-lying terrain, dampness and poor light transmission, as well as old trees with weak growth and old leaves and branches at the lower part of the canopy. The water and mineral nutrients of the mango tree are absorbed, which has little direct effect on the mango tree. Linyi Fertilizer Network Copyright
Linyi Fertilizer Network Copyright
3. Control methods: rational fertilization, increase application of phosphorus and potassium fertilizer; moderate pruning; pay attention to ditch drainage and so on can reduce the incidence. Remove and burn leaves and reduce pathogens. In the orchard with serious disease, spraying 0.5:0.5:100 Bordeaux mixture 1~2 times before the disease spots in early spring or gray-green have not formed zoospores, the effect is good. Linyi Fertilizer Network Copyright
Linyi Fertilizer Network Copyright
(3) Mango Purple Root Disease: Linyi Fertilizer Network Copyright
Linyi Fertilizer Network Copyright
1. Symptoms: The disease mainly affects the base and root of the seedlings. The affected part turned purple-black, the cortex rotted, and the xylem was dry. The growth of the shoots in the shoots was weak, the leaves were pale to yellow, and the whole plant died. The surface of the underground diseased part is covered with purple-red root-like fungus, forming a layer of purple-red velvet-like membrane when wet, and forming a sclerotium sclerotium at a later stage. Linyi Fertilizer Network Copyright
Linyi Fertilizer Network Copyright
2. Pathogens and occurrence rules: The disease is caused by fungi (Helicobasidiumsp.) infection. The pathogens overwinter in the soil, and the conditions are suitable to invade from the roots or roots and necks of the plants. Where the soil is sticky, poor ventilation, easy to knot, poor drainage, the incidence of nursery is heavier. Linyi Fertilizer Network Copyright
Linyi Fertilizer Network Copyright
3. Prevention and treatment methods: timely remove the diseased plants, concentrate on burning, and sprinkle some lime in the diseased hole for disinfection; use 25% carbendazim 500 times solution or copper ammonium mixture 400 times solution to drench the roots, so that the soil is wet and dry, Use 70% dikesone 0.5 kg, add 20-20 kg of fine soil, mix well, sprinkle near the root of the plant, or add 350-400 kg of water to pour the soil; use 40% chloral nitrobenzene per 667 square meters. Add 10~25 kg of fine soil to make toxic soil and apply it on the soil surface of the plant roots. Linyi Fertilizer Network Copyright
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