Definition of leaf roll in English:

leaf roll

noun

mass noun

单词	leaf roll
释义	Definition of leaf roll in English: leaf roll noun mass noun A virus disease of potatoes marked by upward curling of the leaves. Example sentencesExamples The biggest concern in the Pacific Northwest is the green peach aphid, because the aphid transmits leaf roll and other viruses. It claims that their insect-resistant potato requires 40 percent less insecticide (for the Colorado potato beetle and aphids that transmit leaf roll virus disease) than other varieties. Just last year, or early this year, there were some major viral outbreaks of potato leaf roll virus in Australia. Perhaps more insidiously, insects such as fruit fly can carry spores associated with bunch rots, and mealy bug can transmit leaf roll virus.
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