IN THE GARDEN: Scale insect on plants can be treated with insecticide, or dormant oils in cooler weather. May 14, 2022 at 8:30 a.m. by Janet B. Carson ...

Scale is often mistaken for a disease, but it's actually an insect that latches onto a plant and forms a protective shell so it can feed on sap.

"Finally, practicing good hygiene in your plant care will also reduce the chances of a scale infestation," Omelchenko advises. "Regularly wipe the dust off the foliage of your houseplants, and take ...

Plant disease symptoms are typically not very specific. ... Several of our fir trees have been affected by a white scale on the needles, which we first noticed two summers ago.