Environment
Because PLRV is transmitted by aphid vectors it is more prevalent in environments that are conducive to aphid development. Warm humid conditions are preferred, but aphids can thrive in a number of climates as long as it is not too hot and dry, as their soft bodies make them prone to desiccation. In the tropics, aphids persist year round but the efficiency of PLRV transmission is reduced at temperatures above 26 degrees Celsius. The optimal temperatures for the green peach aphid are between 13 and 19 degrees Celsius.
Read more about this topic: Potato Leafroll Virus
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—George F. Will (b. 1941)