The affected parts of the dead leaves caused by the epidemic were water-stained. The diseased parts of leaves and floral moss were dark green, but the roots and bulbs were light brown, and 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 above situation is related to drainage, and the prevention and treatment should pay attention to drainage and dehumidification and rotation. In the early stage of the disease, 58% metalaxyl Mn-Zn can be used as 500 times or 40% of Alpha-Phosphorus 200-300 times as per mu. Kg, 7-10 days once.
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 lesions are flaky and the diseased leaves are 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 ~ 1500 times liquid, spray once in 20 days, 20% Triadimefon 800 ~ 1000 times liquid or 50% carbendazim 600 times liquid, after the leek harvest and seedling height Spray 2 times when 5-8 cm.
The dead leaves caused by root lice are mainly onion fly and late-wing maggot mosquito. The rootworm penetrates into the bulb and feeds on it. The victim's bulb is eaten into a hollow, causing the decayed leaves to turn brown and fade to death. The prevention and treatment can be used for drying roots, applying grass ash or using 5% phoxim granules per kilogram of 2 kg of finely mixed soil to spread around the leek root and then cover with soil to prevent and control. 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 used for drug prevention and control. It can use 25% quinoline EC 1000 times solution, splitting the topsoil of the rhizosphere, sprinkling the roots, and covering the soil at any time, in the morning 9 to 10 Spraying works best. In the emergence period of adult spurts, spray 10% osmium 2000 to 2500 times 2.5% of deltamethrin vinegar 3000 times, and 9 to 10 in the morning spray effect. Late-infested adult mosquitoes live in multiple shades, damp, and humus habitats. During the summer and autumn, the ventilation of the leaves can be reduced. The light tends to be polarized and can also be trapped and killed by 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.
Meditation Pillow,Meditation Cushion,Best Meditation Cushion,Yoga Meditation Cushion
Ningbo Prestigeplus Commodity Co.,Ltd , https://www.prestigemedics.com