Diseases and Insect Pests Prevention Techniques of Day Lilies

1. The main disease root rot is the high incidence period of the root rot of the day lily, manifested as the return to the green, the leaves are small, the roots and stems are dark, the meat is rot, the initial occurrence of the spot, there is a clear episode. When light, no bolting, when the whole point of heavy death. Yellow leaf disease is mostly a physiological disease, manifested as leaf yellowing chlorosis, slow growth and development. The causes of the disease are many, such as inappropriate fertilization, excessive watering, soil compaction, improper cultivation, severe rooting, infestation of underground pests, and lack of nutrients. Leaf spot mainly damages leaves and stems. In the early stage of disease, dark green needlepoints appear along the veins in the middle of the young leaves, and later become yellow spots. The edges are water-stained and translucent. The lesions spread faster than horizontally. The diseased spot occurred at the tip of the leaf and the tip of the leaf was withered; when the flowering moss was severely damaged, it shrank. There are obvious centers of disease. In severe cases, large areas of dry leaves, like fire, mostly occur in the rainy years at the turn of spring and summer, and the onset of high humidity and low temperatures is serious. Rust Disease Day lily rust disease is similar to wheat leaf rust and is a disease caused by fungi. Day lily rust is the most widespread and most destructive disease in Guanzhong area in recent years. It occurred at the end of flower buds in previous years, mainly affecting the growth of lily, the accumulation of nutrients in perennial roots, and the disease period in recent years has advanced year after year. There has been a rust epidemic. A rust-colored bubble-like spot was formed on the leaves and stems of the early stage of the disease. Afterwards, yellow-brown powdery spores were distributed. There were no rules for the arrangement of spore stacks, and the leaves around the spore piles were often chlorotic and pale yellow. When the spores pile up for a long time, the entire leaf turns yellow. There is a clear epidemiological center. Spotting takes place first and the whole field is gradually spread. The main insect pests of the thrips are small, dark brown, and have two pairs of wings. They are narrow and long transparent, and the nymphs are pale gray. Adults and nymphs are mostly concentrated on the back of the leaves or in the tongue and leaves of the flower moss, and damage the leaves, tongue and tender moss, affecting the normal growth of stem and buds. The yellow-headed worm is a wingless larvae with a body length of 3-5 cm, body white and white, eggs with large grains of millet, larvae with green bodies, and 3 pairs of feet. The secretions can induce ants, can parthenogenetic, and reproduce quickly. The yellow locusts first clustered on the back of the leaves, and then spread to flower buds and buds. In severe cases, the buds were all covered with white worms, like candles. The locusts mainly suck the sap on the buds, causing the buds to stunt and fall off, affecting the yield and quality. The roots of the underground pest, lily, are vulnerable to maggots, and the temperature in the spring rises with the ground, and the fleshy roots are eaten, affecting the root absorption function. Prevention and control of pest and rot caused by base rot One of the root crops that cannot be used for diseased plots during the breeding period cannot be composted with day lily leaves. The second is to dig 30cm deep groove around the center of the disease, and mix lime and soil 1:3 to fill in the ditch for blockade and spread. Use a 1:1:100 Bordeaux mixture or 500 times the 70% formazan to root the roots. Each kilogram of a hole contains 1 kilogram of liquid every 7 days for a total of 3 irrigations. Responsive to the disease of yellow leaf disease, the difference diagnosis and treatment. Appropriate use of water and fertilizer, farming methods should be appropriate, especially in the peak period of growth and development, fertilization, cultivator, etc., farmland operations should avoid root injury, for the lack of yellow leaf disease caused by increased top dressing and foliar spray fertilizer, top dressing nitrogen fertilizer , Libao, P and K fertilizer or multi-component compound fertilizer. Shi Tian Feng Su, Li Bao, potassium dihydrogen phosphate, iron fertilizer and so on. When the ground pests are damaged, 1 kg of 3% carbofuran is sprayed before the irrigation. When the density of insects is high, 5% of the 200-fold phoxim liquid is used to irrigate the roots, each point is 0.5 kg. Before the bolting of day lily, a comprehensive inspection and control of pests and diseases was conducted. Spray 500 times mancozeb manganese, 3000 times imidacloprid or acetamiprid and related nutrient solution were sprayed to achieve the effect of preventing disease and controlling insects and increasing nutrition. Lily buds should pay attention to the occurrence of rust after budding, and they found a little bit of a rule and found a piece of turbidity. When the spotting occurred, spray 700 times mancozeb and 1000 times 25% triadimefon mixed solution, implement prevention and control, and spray once every 7-10 days. When rust is popular, it must be sprayed and controlled for more than three times.

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