Cypress scale

Cypress scale (Carulaspis minima) is an insect belonging to the order Hemiptera and the family Diaspididae. It is a specialized pest that primarily targets conifer species, causing significant stress to both ornamental and forest trees.

This pest affects a wide range of host plants, including cypress, thuja, juniper, cedar, and pine. Infestations are particularly common in nurseries, urban parks, and residential landscapes where environmental stress factors can make plants more susceptible to colonization by scale insects.

The life cycle of Carulaspis minima typically involves one to two generations per year, depending on the climate. They overwinter as fertilized females protected by a tough, waxy scale on the needles or bark. In spring, females lay eggs, which soon hatch into mobile nymphs known as "crawlers" that spread throughout the plant foliage.

The damage is caused by the insects feeding on plant sap. As they suck nutrients from the needles and shoots, the foliage begins to yellow, desiccate, and drop prematurely. Severe infestations lead to significant branch dieback, loss of aesthetic value, and in extreme cases, the total death of the host plant.

Effective management strategies include integrated pest control measures:

• Regular monitoring of host plants for signs of scale cover.
• Pruning and destroying heavily infested branches.
• Application of systemic insecticides specifically during the crawler stage.
• Use of horticultural oils in early spring to smother overwintering populations.