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. The sap is absorbed from the tender leaves, stems and buds, which makes the plants wither and grow poorly. Control methods: (1) clean the countryside, eradicate weeds in the field, and reduce the overwintering insect population; (2) during the occurrence period, spray 1000-2000 times of 50% fenitrothion or 1500 times of dichlorvos EC every 7-10 days for several times in a row.
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Prevention and control measures of lily diseases and insect pests
The main results are as follows: (1) when planting lilies in rotation for 3 years, lilies should be planted from bottom to top to reduce the spread of bacteria. (2) the bulbs without disease, mite and mechanical injury were selected as species to reduce the source of bacteria and mites. (3) to burn the litter, the remains of diseases and insect pests in the field and reduce the source of diseases and insect pests. The organic fertilizer was compost and fermented and then applied to the lower layer of the soil. (4) Deep ditch and high border, clear ditch and drain, and control soil water content. (5) impregnation and disinfection to kill mites. Before sowing, add 4000 times of 20% promethazine wettable powder and 70% methyl topiramate wettable powder.
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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. There are many diseased bulbs, dry weather and aphids.
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