[hwahyt-flahy, wahyt-]
noun, plural whiteflies.
any of several plant-sucking, homopterous insects of the family Aleyrodidae, having the body and wings dusted with a white, powdery wax, and being widely distributed chiefly in tropical regions where they are often serious crop pests, as Dialeurodes citri (citrus whitefly) commonly occurring on citrus trees, and Trialeurodes vaporariorum (greenhouse whitefly) inhabiting greenhouses.

1885–90; white + fly2

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World English Dictionary
whitefly (ˈwaɪtˌflaɪ)
n , pl -flies
any hemipterous insect of the family Aleyrodidae, typically having a body covered with powdery wax. Many are pests of greenhouse crops

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Example sentences
To reduce food sources for ants, keep aphid and whitefly populations under control.
If you detect fig whitefly, you may want to consider a two-step treatment.
Whitefly physiology, biochemistry, etc will be investigated in relation to cotton plant insect interactions.
The pomegranate whitefly is also called the ash whitefly.
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