Lily virus disease (lily symptamless virus)
The common lily virus diseases are Verticillium wilt and mosaic. There are no special disease spots on the verticillium wilt leaves, the whole plant is yellowish and the internodes are shortened. The plant is dwarfed, and the leaves are yellowed and atrophied. Irregular light green mottles are produced on the mosaic leaves, and then the small light green parts are connected and enlarged, forming slender yellow spots along the veins, and later slightly sunken, turning yellowish brown to reddish brown. The virus overwintered mainly in the bulb and became the source of infection at the beginning of the second year, and the reinfection in the field was mainly caused by aphids. The disease occurs seriously when there are many diseased bulbs, dry weather and a large number of aphids.
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How to control lily diseases and insect pests
First, the blight is mainly harmful in the seedling stage, causing the plant to wither. The ventilation is poor and the disease is serious when there is stagnant water in the field. Prevention and control methods: (1) reasonable crop rotation, selecting plots with good drainage and loose soil; (2) strengthening field management, timely trenching and drainage, improving ventilation and light conditions; (3) soaking the stems of seeds with 1% thiram solution or 2% formalin for 15 minutes before sowing; (4) when the disease occurs, remove the diseased plants in time, and disinfect the diseased area with 5% lime milk. Second, aphids occur in early summer. Cluster
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Control measures of Lily Diseases
The prevention and control of epidemic disease (1) the use of high box deep trench or ridging cultivation requires that the border surface should be flat in order to facilitate the elimination of the water system, and the diseased plants should be dug out as soon as possible, burned or buried deeply. (2) adopt the technology of formula fertilization and appropriately increase the application of potash fertilizer to improve the disease resistance. (3) spraying 250 times of 40% triethyl aluminum phosphate wettable powder or 58% metalaxyl and manganese zinc wettable powder, 64% poison alum 500 times, 72% DuPont Kelu 800 times.
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