Leaf dryness often occurs during the growth period of leeks, and some of the dry leaves are caused by the disease and gray mold, and some are caused by root rot or physiological diseases. The vegetable farmers should prescribe drugs according to the symptoms.
Blight caused by the disease is the main disease in the protected area. Water-stained lesions were found on the affected parts. The leaves and scapes were dark green, while the roots and bulbs were light brown. The diseased parts had no obvious edges. The diseased part produces white sparse mildew when it is wet, and the diseased leaves become dry yellow when dry. The soft rot of the infected plant's roots and stems cannot normally absorb water and nutrients, resulting in the overlying or dry parts of the ground. The occurrence of the disease is related to drainage. During the prevention and treatment, attention should be paid to drainage, dehumidification and rotation. In the early stage of disease, 25% of thioredox may be used as 600 times or 58% of metalaxyl MnZn as 500 times or 40% of EDHP as 200 to 300 times. Liquid spray, 40 to 50 kg per mu, 7 to 10 days 1 time.
The incidence of dead leaves caused by gray mold begins with the tip of the leaf blade developing downwards. At the beginning of the disease, white and light brown spots appear on the front and back of leaves. As the disease progresses, the lesion expands into a fusiform or elliptical shape, and finally the lesion is contiguous and the diseased leaf is dry. When wet, the diseased leaves produce a layer of gray to gray-green and dense mold. In addition to control and drainage in addition to wet down, available 50% speed Keling 1000 to 1500 times liquid, 20 days spray 1, 20% Triadimefon 800 to 1000 times liquid or 50% carbendazim 600 times, after the leek harvest and seedlings Spray 2 times when the height is 5-8 cm.
The root sucks its roots and digs into the bulbs to feed. The victim's bulbs are sucked into empty holes, causing the leaves to fade and die. Control can be used on the sun root, apply planting wood ash or 5% phoxim granules per acre 2 kg mixed with fine soil sprinkled near the leeks and then covered with soil. During the period of larvae damage, it was found that the tip of the leaf began to yellow and become soft and lodging on the ground. It can be controlled by irrigating, and 75% phoxim EC can be used 500 times or 25% quizopriosin EC 1000 times to break open the topsoil of the rhizosphere. Sprinkler irrigation, covering the soil at any time, spraying at 9 to 10 am is best. In the emergence period of adult (mid-late and late-April, mid-June, late-July and mid-October), spray 10% osmium 2000 to 2500 times or 75% phoxim 1000 times or 2.5% deltamethrin. 3000 times liquid, spray effect is good from 9 to 10 in the morning. Adults have a tendency towards light, and they can also be trapped with frequency-vibration insecticidal lamps.
Physiological diseases caused by dry leaf amaranth dry tip, leaf withered, dead plant phenomenon, and sometimes with soil acidification, ammonia poisoning, high temperature (above 35 °C) and low temperatures caused by white tip rotten leaf, lack of calcium, lack of boron, manganese surplus It will also cause yellowing of the leaf tip and can be used to take preventive measures.
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