In recent years, garlic cultivation has become more and more extensive, and in some areas, it has been planted for many years, and the occurrence of pests and diseases has become heavier and heavier. Disease articles The main diseases are garlic leaf blight, bacterial soft rot, garlic sclerotinia, Phytophthora root rot, and epidemics. Leaf blight Harmful feature Leaf blight is mainly caused by garlic leaves, and the onset begins at the tip of the leaf or other parts of the leaf. At the beginning, the flowers are white with small dots, and then expanded into irregular or elliptical gray-white or gray-brown lesions. The black mold is formed on the upper part. In severe cases, the diseased leaves are all dead, and many black small particles are scattered on the surface. When the damage is serious, the whole plant does not convulsion. Occurrence The occurrence of garlic leaf blight is positively correlated with the field temperature and humidity. Generally, the higher the temperature, the greater the humidity and the heavier the disease. After years of heavy planting, the growing weak land of garlic has become heavier. Excessive application of nitrogen fertilizer, insufficient base fertilizer, and serious onset. The planting density is high, the field ventilation is poor, and the incidence is heavy. Control method In the early stage of the disease, a therapeutic fungicide such as difenoconazole, benzoyl bromide or tebuconazole may be used, and a protective agent such as Daisenlian or pyraclostrobin may be used together to treat the disease while preventing disease. Bacterial soft rot Harmful feature After the garlic is infected, it first develops from the leaf margin or midrib, and forms yellow-white streaks along the leaf margin or midrib. When the humidity is high, the diseased part is yellowish brown and soft. Generally, the foot leaf first develops, and then gradually expands to the upper part of the leaf, causing the whole plant to be yellow or dead. Occurrence Planting earlier, flooding or growing fields are heavy. Control method At the time of onset, it can be sprayed with methicillin, copper acetylcholine, Bacillus subtilis and the like. Garlic sclerotinia Harmful feature The diseased part is at the base of the pseudo-stem of the garlic under the membrane. The initial lesion is water-stained, and then darkens into grayish white, the ulcer rots, and the decayed part emits a strong garlic odor. After the garlic leaf sheath rotted, the upper leaves showed wilting, and gradually yellowed and died. The roots of the garlic and the root disk rotted and scattered. Occurrence In the old garlic area planted repeatedly in successive years, the number of pathogenic bacteria is heavy. Sowing early, high temperatures in autumn and winter, can occur before winter. The terrain is low and the drainage is poor, and the land below the river is heavy. Control method After the onset, it can be sprayed and controlled with agents such as mold, sulphur, urea, cyprodinil and boscal. Phytophthora root rot Harmful feature The pathogen mainly damages garlic roots and bulbs. At the beginning of the disease, the roots gradually become brown and rot. After the bulbs are cut, the bulbs near the root plate turn brown. The leaves of the infected plants gradually turn yellow from the bottom, dry and die, and the plants are obviously Dwarf, garlic is short or not convulsions, serious disease plants can not form yield or whole plant death. Occurrence The temperature in the sowing period is low, and the year in which the field humidity is high is heavy. In the early spring, the temperature changes greatly, and the land that is watered too early is heavy. Large water flooding, heavy plots of heavy flooding occur. Control method After the onset of the disease, the base of the spray stem can be used for the treatment of the base of the sprayed copper, Bacillus subtilis, and carbendazim. Blight Harmful feature It is mainly harmful to the leaves. At the beginning of the disease, the leaves are pale to pale yellow water-immersed spots in the middle of the leaves or on the tip of the leaves. The edges are light green and the lesions spread rapidly. Soon half or the whole leaves are sag, and the lesions rot when the humidity is high. It produces sparse grayish white mold, that is, pathogen cysts and sporangia; the flower stems are also stained with water stains, causing the whole plant to die. Occurrence The rainfall is large, the number of foggy days is high, and the temperature is high when the temperature is high. The plots with late sowing date are seriously affected. Nitrogen fertilizer is premature and overweight, and the incidence of fertilizer and water is very high. Excessive planting, resulting in poor ventilation, heavy humidity in the field. Control method Timely use metformin manganese zinc, cream urea manganese zinc, enoylmorpholine and other pharmaceutical spray control, while paying attention to strengthen water and fertilizer management. Pest articles The main pests are onion species (garlic), leeks, scorpion (éŸè›†), thorn roots, hummers, and snails. Onion flies (garlic) Harmful feature The larvae break into the garlic bulbs, causing decay, leaves with yellow, wilting, and even death. Leek, late eyelid, mosquito (éŸè›†) Harmful feature The larvae lived in the garlic bulbs, and the outer sheath was damaged. After the outer sheath was rotted, only the veins remained, and gradually inwardly, causing damage to the garlic and garlic. Prickly root Harmful feature Mainly for the garlic leaf sheath and the base of the fibrous roots below the soil surface, causing yellowing of the leaves of the plant, the garlic grows weak and the garlic is small. Hummer Harmful feature The damaged leaves form dense white spots or long strips. In severe cases, the leaves are twisted and yellow, and the young leaves of garlic and the damaged new roots stop growing. Liriomyza Harmful feature The female pricked holes on the leaves to lay eggs. The larvae pecked into a tunnel in the leaf tissue, which was curved and severely confusing, affecting the growth of garlic. Control method Roots and roots: mainly through pre-sowing soil treatment, chemical dressing, initial spraying, etc. The effective agents are phoxim and chlorpyrifos. Hummer: The initial stage can be controlled by imidacloprid, phoxim, chlorpyrifos, beta-cypermethrin, etc., pay attention to alternate use. Liriomyza sativae: When the larvae of the larvae are more than 20%, the oozing insecticide should be selected to kill the larvae of the larvae, and the chlorpyrifos, imidacloprid, chlorfenapyr or cyanidia can be selected. Ester, etc., pay attention to alternate use of rotation. More pesticide knowledge , please pay attention to China Pesticide Network Jiangmen Dilin Lighting High-Tech Co., Ltd. , https://www.jmdilinlight.com
