In recent years, garlic has grown more and more widely. In some areas, it has been cultivated for many years. The occurrence of diseases and insect pests is also getting heavier. Disease articles The main diseases are garlic leaf blight, bacterial soft rot, garlic sclerotium, Phytophthora root rot, and diseases. Leaf blight Damage characteristics Leaf blight mainly damages the garlic leaves, and the onset begins at the tip or other parts of the leaves. At the beginning, it was a small white dot, followed by an irregularly shaped or oval-shaped grayish-white or grayish-brown spot. The upper part of the crop was black and mildewy. When it was severe, all the diseased leaves withered and many black granules were scattered on the top. When the damage is severe, the whole plant does not twitch. Occurrence characteristics ◠The occurrence of garlic leaf blight is positively correlated with the temperature and humidity in the field. Generally, the higher the temperature, the greater the humidity and the more severe the disease. ◠For many years of heavy planting, the land where the garlic is growing is heavy and heavy. ◠Excessive use of nitrogen fertilizer, insufficient base fertilizer and heavy onset. ◠High planting density, poor ventilation in the field, and heavy onset. Control methods Therapeutic fungicides such as difenoconazole, benzacenonitrile and tebuconazole can be used at the early stage of the disease, together with the use of protective agents such as dexamethasone and pyraclostrobin together to prevent diseases while treating diseases. Bacterial soft rot Damage characteristics After the garlic is infected, it begins with the leaf margin or midrib, and yellow-white streak is formed along the leaf margin or midrib, which can permeate the entire leaf. When the humidity is high, the diseased part is yellow-brown and soft rot. In general, the first leaves become sick, and then gradually expand to the upper leaves, causing the whole plant to yellow or die. Occurrence characteristics Earlier sowing, heavy flooding or overgrowth of the field was heavy. Control methods When the onset of disease can be used hymexazol, collateral ammonia copper, Bacillus subtilis and other spray control. Garlic Sclerotinia Damage characteristics The site of the disease was the base of garlic pseudostems under the membrane. The initial lesions were water-stained and later became dark gray, and the ulcers rotted. The rotten parts gave off a strong garlic odor. After the garlic leaf sheath decayed, the upper leaves showed wilting, and gradually yellowed and dead, and the garlic roots and root disks rotted. Occurrence characteristics ◠In the old garlic area planted year after year, the number of pathogenic bacteria was heavy. ◠Early sowing and high temperatures in autumn and winter can cause disease before winter. ◠Low-lying, low-lying drainage, which occurs near the lower tide mass of the river. Control methods After onset, mildew rot, isoprenil, cyprodinil, boscalid and other agents can be sprayed and prevented. Phytophthora root rot Damage characteristics The pathogens mainly damaged garlic roots and bulbs. The roots were watery and brownish and decayed at the initial stage of disease. After bulbs were cut, the bulbs near the root plate became brown; the diseased plant leaves gradually turned yellow from the bottom, dead and dry, and the plants obviously. Dwarf, garlic bulbs are short or not convulsions, serious diseased strains can not produce yield or the whole plant died. Occurrence characteristics ◠The temperature during the sowing period is low and heavy in the fields with heavy humidity occurs. ◠Temperatures in the early spring change greatly, and land that is watered too early is heavy. ◠Flood irrigation, heavy land masses occurred. Control methods After the onset, it can be used to control the base of spraying stems such as ammonia copper, Bacillus subtilis, and hymexazol. Blight Damage characteristics The main damage to the leaves, leaf disease at the beginning of the disease in the middle of the leaf or leaf tip pale to light yellow water dip spot, the edge of light green, lesions spread quickly, half a year or the entire leaf wilted, when the humidity is high, the plaque rot, Sparse gray molds were produced on them, namely the cysts and sporangia of the pathogens; the infected stems were also rotted with water stains, causing the whole plant to die. Occurrence characteristics ◠The rainfall is large and the number of foggy days is high. When the temperature is high, the disease is heavy. ◠The onset of land mass is too heavy after sowing. ◠The incidence of excessive application of nitrogen fertilizer is too early; the fields with poor fertilizer and water conditions are rapidly onset. ◠Over-close planting causes poor ventilation and heavy on-site humidity. Control methods Timely selection of metalaxyl manganese zinc, urea manganese zinc, dimethomorph and other agents spray control, while paying attention to strengthening water and fertilizer management. Insect articles The main insect pests are onions in the onion (garlic pods), leeks, larvae, cockroaches, grasshoppers, and others. Onion land fly (garlic aphid) Damage characteristics The larvae break into the bulbs of garlic, causing decay, yellow leaves, wilting, and even death. Amaranthus chinensis Damage characteristics The larvae lived in the bulbs of garlic, and the outer sheaths suffered damage. After the outer leaf sheaths were rotted, only the veins remained, and they gradually fed inwards, resulting in the damage of garlic cloves and garlic lobes. Acupuncture Damage characteristics The main damage to the soil surface below the garlic leaf sheath and fibrous root base, resulting in plant leaves yellow, garlic grow weak, garlic small. Hummer Damage characteristics The damaged leaves form dense white spots or strips. In severe cases, the leaves are distorted and yellow, and the young leaves of garlic and new damaged roots stop growing. Liriomyza Damage characteristics The females punctured and spawned on the leaves, and the larvae devoured into tunnels in the leaf tissue, showing a curvilinear form, which was severely indistinguishable and affected the growth of garlic. Control methods Roots, roots and roots: mainly through sowing before the soil treatment, seed dressing, the initial shower, etc. for prevention and treatment, effective agents are phoxim, chlorpyrifos and so on. Hummer: At the beginning of the development, imidacloprid, phoxim, chlorpyrifos, and beta cypermethrin can be used for prevention and treatment. Attention should be paid to alternating use. Liriomyza sativae: When the oomyomycidae egg-laying and feeding hole reaches more than 20%, they should promptly select and infiltrate a better ovicidal agent to kill the eggs of the larvae. Select chlorpyrifos, imidacloprid, chlorfenapyr or fenprofen Ester, etc., pay attention to alternating use. fine chemicals,fine chemicals corporation,fine chemical companies Shaanxi YXchuang Biotechnology Co., Ltd , https://www.peptide-nootropics.com