Root disease of kiwifruit is generally transmitted by soil, causing root rot, root cancer, Phytophthora and root knot nematode disease, or soil disinfection before planting trees, causing the virus to spread.
Root rot causes rot
Agricultural control: 1 Cultivate disease-free seedlings, plant graveous plants for many years to grow disease-free seedlings, apply fertilizers or cakes that are fully matured during fertilization, 2 remove all plant residues in the land when constructing new gardens, and 3 water requirements for kiwifruits. A fruit tree that is more afraid of earthworms and weak in moisture resistance must adopt reasonable irrigation methods in high temperature seasons. Avoid flooding or irrigating trees in groups, and can introduce irrigation from canals separately; 4 High groundwater level, low lying, drainage Poor orchards, after prolonged rainfall or heavy rain, should be drained in time to reduce the humidity in the field and increase soil permeability; 5 reasonable planting depth; 6 reasonable load.
Chemical control: For mature orchards that have been infected, use 0.8% of bacteria to destroy 300 times or 40% of carbendazim to irrigate the roots 400 times. Each tree is filled with 2 to 3 kilograms of liquid medicine, which is fed once every 15 days. Irrigation 2 to 3 times, can significantly inhibit the disease and increase the yield per plant.
Root cancer causes rot
Control methods: 1 Do not use the plots with root cancer as the nursery for previous crops, and do not transport seedlings from the wards. If diseased plants are found in the transported seedlings, they must be burned out, and other seedlings should be invaded with 2% lime solution. Bubble for 1-2 minutes, or sterilize it with 0.1% H 2 O 3 for 5 to 5 minutes; 2 plants with milder disease in the field, cut open the root of the soil and use a knife to scrape the tumor, and use Bami 3 to 5 degrees of sulfur Mixture or 5% of bacteria water agent 30 to 50 times, or 100 times liquid bacteria wiper brushing the wound. Plants with severe disease were completely burned with roots and the soil was fumigated with methyl bromide.
Phytophthora rot
Control methods: 1 The grafting interface for planting seedlings must be higher than the ground. It is better to plant ridges with high ridges, and the watering should be uniform. The soil with high organic matter content, looseness, good air permeability, low groundwater level, and water accumulation should be selected. Build the garden; 2 At the beginning of the disease, open the roots to dry the soil, scrape the diseased tissue, sterilize with 0.1% mercury solution, and dilute it with 500-fold solution of benzene WP before the rainfall in mid-May of the Gregorian calendar or before watering. Root; 3 base fertilizer, must not use unprocessed raw sheep manure, raw cow dung, pig manure, raw chicken manure and no decomposing human excrement, these are not decomposed manure, too many bacteria, with each The source of infection of the species, especially raw chicken manure, is not only strongly alkaline but also contains a considerable amount of uric acid, which in turn poisons the root system.
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