Rhinophora radiata nematode disease occurs throughout the province and is rare in sandy loam or loose red soil, causing poor plant growth, easy lodging, and low yields.
1, symptoms
The upper part of the diseased plant is short, the leaves are yellow and dull, the plants are easy to "disperse", and the problem of budding is difficult. The diseased plants in the early stages of fruit bearing can not afford to bear the weight due to the roots, resulting in lodging; the underground department can see the root knot and the apical part. Insects are drumstick-shaped or curved. The roots of the beneficiaries were less black-brown, with severe epidermis erosion. Loose, breathable, less soil is more common. The banana plantations with good planting conditions have no significant symptoms in the above-ground parts of the banana trees that are infected with root-knot nematodes. Drainage is poor or the diseased plants in the sandy soil are susceptible to yellowing and development.
2. Pathogens
The important pathogenic nematodes are southern root-knot nematodes. Other pathogens are Java root knot nematodes and peanut root knot nematodes.
3, disease conditions
The primary source of infestation was from diseased suckers and diseased soils, and the distance between them was mainly influenced by sucking buds. The host is very large and can infect a wide range of fruit trees, vegetables and weeds.
4, prevention and control essentials
(1) Agricultural control
Planting disease-free seedlings: New planting areas should receive disease-free tissue culture seedlings or use disease-free first and second generations of perennial root buds. The planted shoots in the new area should be cleared of rotted roots and soil attached to the appearance of bulbs before planting.
(2) Chemical control
1 Before nursery, treat the nursery soil to kill nematodes completely by killing the pathogens and weed seeds with 20% line of water or 98% of must-kill micro particles.
2 When transplanting, use 20% ground worm powder granules 20-25 grams per planting point, or 10% Fuzeduo granules 5-10 grams per strain, or nematode bisulfite microparticles (biological killer, per gram Twenty-five million spores of the genus Verticillium spp.) 15 to 20 grams of mixed soil and basal fertilizer were planted.
3 After the planting of the invention, the susceptible insects should be used in the later period of nutrient development with 20 to 20% of insects, 20 to 25 grams per plant, or 10% of Fukuduo 5 to 10 grams per plant, or 15 to 20 grams of nematode insects per plant. Apply to the soil surface 20 to 30 cm around the head of the plant, then cover the soil 5 to 10 cm; or irrigate the roots (about 1 kg/plant) with 1.5% mycelial WP 4,000 times, or 1.8% schizon oil 2000 times solution + 40% phoxim EC 1000 times solution root. The application was repeated every 3 months depending on the number of application fields.
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