NC State Extension Publications

Description and Biology

Skip to Description and Biology

The minute cypress scale insect, Carulaspis minima, is a very small (up to 1 mm wide) armored scale insect. The armor of females is circular to oval and is white and parchment-like. In the center is a light yellow cast skin of an earlier nymph stage. The armor of the male scales is oblong, white and about 1 mm long. At one end is the pale yellow cast skin of the crawler stage. Adult males are tiny, gnat-like insects with four eyes and a tiny waxy tail filament. Little is known of the biology of minute cypress scale insects. If they behave like other armored scales, these scales hatch from eggs laid by the mother scale under her armor. The tiny crawlers emerge to crawl about seeking a suitable place to feed. Female scales molt twice before maturing and male scales molt three times. Males emerge from the male armor and seek females with which to mate. The males soon die. Females soon lay eggs for another generation. After laying eggs, the females die. The armor of both males and females clings to the infested shrubs long after the scales inside die (females) or leave (males).

Minute cypress scales on juniper twigs.

Minute cypress scales on juniper twigs.

A family of minute cypress scale insects.

A family of minute cypress scale insects.

Minute cypress scale crawlers.

Minute cypress scale crawlers.

Host Plants

Skip to Host Plants

Minute cypress scales are found on the needles and bark of junipers, cypresses, and Leyland cypress. Because they are so small, minute cypress scales are easily overlooked. The minute cypress scale seems to be a debilitating pest of junipers and Leyland cypress and is considered an economic pest. Infested plants dieback and are off color.

Residential Recommendation

Skip to Residential Recommendation

Pesticide sprays are often required for control. Horticultural oils or Safari should give adequate control of the minute cypress scale if used twice about 14 days apart.

References

Skip to References

For assistance with a specific problem, contact your local Cooperative Extension Center.

This Factsheet has not been peer reviewed.

Publication date: May 14, 2013
Revised: Oct. 4, 2019

N.C. Cooperative Extension prohibits discrimination and harassment regardless of age, color, disability, family and marital status, gender identity, national origin, political beliefs, race, religion, sex (including pregnancy), sexual orientation and veteran status.