soft scale

any of numerous homopterous insect pests of the family Coccidae, as leafhoppers, aphids, and whiteflies, that are destructive to crops, shade and fruit trees, and various houseplants.

1890–95 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Example sentences
Explain the difference between armored scale and soft scale, and give an example of each.
The pine tortoise scale is a soft scale so it produces honeydew.
Brown soft scale is common in greenhouses and on houseplants.
The rubber plugs rub against the tube walls to remove slime and soft scale.
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