curly top

noun Plant Pathology.
a disease of plants, especially beets, characterized by puckered or cupped leaves and stunting or distortion, caused by a virus, Ruga verrucosans.

Origin:
1900–05, Americanism

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Encyclopedia Britannica
Encyclopedia

curly top

viralviral disease of some 150 cultivated and weed plants in more than 70 genera in the western half of North America, including varieties of bean, beet, carrot, eggplant, spinach, tomato, vine crops, carnation, delphinium, geranium, pansy, petunia, strawflower, zinnia, and flax. The virus is transmitted in North America, Europe, and Asia by the beet leafhopper (Circulifer tenullus) and in South America by Agalliana ensigera, which overwinter on weed hosts and in the spring migrate to sugar-beet fields. Diseased plants are usually stunted or dwarfed and have thickened, yellowed, and bunched or curled leaves that frequently die early

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
Resistance to curly top viruses through virus induced gene silencing.
The weed harbors insect pests that transmit curly top virus, which affects many important vegetable crops.
And they're working on new sugar beets that resist one or both of those fungal diseases-along with curly top virus.
Zucchini yellow mosaic, curly top yellow, and silver leaf have become problems in the past few years.
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