Potato Light Mosaic Disease Prevention and Control Measures
[Host crops] are limited to Solanaceae crops.
[Disease Diagnosis] Symptoms mainly manifest on the leaves. Slightly chlorotic mottled leaves were produced on the leaves of the diseased plants. In severe cases, leaf mosaics were thick and pale, irregularly alternating, and veins of different sizes appeared on veins and veins. Sometimes the leaves are slightly retrenched and the leaf margins are wavy and shrunken. Infected leaves as a whole bright. The victim plants usually have their stems bent outwards, making the leaves slightly open. Tubers are generally poisonous and have no symptoms. The degree of symptomatic performance sometimes varies with climate, potato varieties, and virus strains.
The causative virus is the potato virus A. The virions were linear and 730 nm in size and 11 nm in size. The virus inactivation temperature was 44-52°C, the dilution endpoint was 1-0.001, and the in vitro survival period was 18-24 hours. Serologically, PVA and PVY are related.
Disease Pathogeny Viruses can pass winter with seed potatoes during storage and serve as a major source of virus in the field in the following year. After onset in the field, it can be transmitted through sap, grafting, but the sap propagation is not stable. Seven species of locusts can transmit the virus. The main ones are potato tuber borers and peach pods. The method of transmission is non-persistent and the efficiency of virus transmission is high.
The epidemic characteristics of the disease are similar to that of heavy mosaic disease. The severity of the disease, the degree of exposure by the seed virus, and the climate temperature have a greater impact. Diseases are often severe in high-temperature and dry years and regions, while diseases are suppressed in rainy or cool mountainous regions. Cold symptoms can also occur when cold. There are differences in the resistance of potato varieties to this disease.
[Control measures] Refer to prevention and treatment of potato heavy mosaic disease.
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