Five common diseases and control methods of fennel
1. Powdery mildew. Damage to the aerial parts of plants, the more mature part of the first disease, the initial appearance of white powder spots on the surface of the leaves, then gradually expand and merge with each other to form a thick layer of white powder on the surface of stems and leaves, severe leaves fade, necrosis and wither.
Control methods: In the early stage of disease, timely use 15% triadimefon WP 1500-2000 times, 25% demulsification oil 3000 times, 70% thiophanate-methyl WP wet 1000 times 75% chlorothalonil (or 70% zein zinc) WP 1000 times, spray once every 10 to 15 days, and spray 2 or 3 times. Planted fennel cultivated in protected areas can also be sprayed with 5% chlorothalonil (or 5% Garneton) dust at the initial stage of disease, 1 kg per mu.
2, root rot. Mainly damage the roots, resulting in dead seedlings or rot, severe plant necrosis, a great impact on the yield. In the early stage of disease, the root tip or radicle became brownish water stain, and later became dark brown necrotic lesions. Gradually developed, the main root was rust yellow to rust brown, rotted, and only fibrillar vascular bundles remained. Diseased plants can easily be pulled out of the soil. On the surface of the rhizome, a white mold layer will be formed on the surface of the rhizome. The leaves of the diseased plants will turn yellow and necrotic from the outside to the end, and the whole plant will die.
Control methods: soil treatment, before sowing or before transplanting, use 50% carbendazim (or 50% licorice, 70% soil bacteria elimination, etc.) WP 2 to 3 kg per mu, mixed with fine soil 50 to 60 kg , ditch or hole application; liquid irrigation root, with 50% carbendazim WP 500 times, 65% more than WP 1000 times, 25% demulsifier 1000 times or 45% special Ke Duo Suspension 1000 times liquid, planting points when planting watering, or in the initial stage of the disease, root irrigation, per plant (acupuncture) irrigation liquid 0.25 to 0.5 kg.
3, Sclerotinia. The main damage stems, stem bases and petioles, the appearance of the victim plants withered, the disease was brown and wet, and later become soft, rot, the surface of spider filamentous mold, the late disease on the surface and stem cavity produced dark brown mouse feces Sclerotia.
Prevention methods: soil treatment, for the disease-resistant land that is not easy for crop rotation, when planting, use 40% of 40% pentachloronitrobenzene per acre and add 25 kg of fine soil to make poison soil applicator; chemical control, in the early stage of disease, timely Spray 50% quick-inking WP 1500 to 2000 times, 50% acetaminophen WP 1000 times, 50% nellikon WP 1000 times or 40% sclerotin WP 500 times .
4, gray mold. It mainly damages the leaves and petioles, and sometimes it also harms the bulbs. It begins with the onset of senescence, necrosis, or waterlogging on the leaves or petioles, causing necrosis and rot in the branches and leaves, producing a gray moldy layer on the surface of the diseased part. The bulbs were stained with gray-green to gray-brown necrosis at the beginning of the disease, and later they were softened and rotted, resulting in a gray mold layer on the surface of the diseased part.
Control methods: Before planting or setting seedlings, use 65% Tamyroxin WP 500 times, 50% Polymyxin WP 600 times, 45% Tex Multisuspension 1000X or 50% Nongrilling Wettable powder 400 times liquid, spray on the greenhouse soil, wall, shed film, and other surface sterilization. In the early stage of disease, 65% tymefone WP 600 times, 50% Polymyxin WP 700 times, 45% Tec Multiple Suspension 800X, and 50% Triflumyl WP 500X Or 50% Nullyn WP 1000 times spray.
5, virus disease. Damage the whole plant. The deformed leaves of the diseased plants are shrunken, or distorted, globose or variegated. Plants with early onset are dwarfed, growth is significantly inhibited, no convulsions are observed or results are small and small, and late-infection plants are affected by flowering and fruiting.
Control methods: Cockroach disease prevention, anise virus disease spread through locusts, found locust damage, and timely use of 50% anti-influx can be wet, powder 3000 times, 10% decanoate WP 3000 times, 2.5% Uranus Emulsion 3000 times solution, 21% killer emulsion EC 300 times solution or 48% Lethben EC emulsion 2000 times solution. Foliage spraying naphthalene acetic acid 20 mg / kg, increasing production spirit 50 ~ 100 mg / kg and 1% superphosphate solution, can promote plant growth and enhance disease resistance. In the early stage of the disease, spraying with 1.5% of diseased Ling-Emulsion 800-1000 times solution, 20% Virus A WP 500-fold solution or potassium permanganate 1000-times solution has a certain effect.
In a hydroponic system, plants are placed in nutrient-enriched water. Mediums such as gravels, sand or vermiculite can also be used. Thus plants which are placed in the water absorb the nutrients very easly. When the nutrients from the water starts finishing , water is recycled or additional nutrients are added.
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