Symptoms can develop during the entire reproductive period, and early onset has a large impact on yield. Infected at the seedling stage: After a few true leaves were developed, the symptoms were obvious. Light green and dark green leaves were mottled on the leaves. Sometimes it is clear veins and the leaves are twisted and twisted. Plants become infected, the diseased plants are obviously dwarfed, and the leaves are irregularly distorted.
Pathogen Lettuce mosalcvirus (LMV), known as lettuce mosaic virus; Cu-cumbermosaicvirus (CMV), known as cucumber mosaic virus, lettuce mosaic virus is Potato Y virus, potato Y virus, granules linear, length 750nm, dilution Limit point 10 to 100 times, 2 to 3 days in vitro poisoning period, the toxic temperature 55 ~ 60 °C, through the sap or tapeworm poisoning.
Transmission routes and disease conditions The source of the poison comes from nearby lettuces, lettuce, spinach, and so on. Seeds can also be poisonous and can be seen after emergence. The field is mainly transmitted by locusts, and diseased strains are also poisoned when the diseased strain contacts with friction. Peach moss has the highest transmission rate. Carrot pods, melon pods, and big larvae can also be used for transmission. The occurrence of the disease is related to the expansion and weather, high temperature and drought, and the locusts are more affected. The average temperature is generally higher than 18°C, and there is a lack of water in the field, and the disease spreads quickly.
Control methods (1) selection of disease-resistant varieties. (2) When planting in summer and autumn, appropriate shade on the insect net or shade net or plastic film can reduce the incidence. (3) After the emergence of small water pouring, appropriate seedlings, timely detection and prevention of aphids. (4) In the initial stage of disease, spray 20% Ningnanmycin 500 times liquid or 24% mixed acid and alkali copper water emulsion 800 times.
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