PEST

NAME
Rose Scale
Aulacaspis rosae

ORDER
Hemiptera

FAMILY
Diaspididae

Description of the Pest
Females are flat, rounded white scales, up to 3mm across; males are smaller and narrower. Nymphs (or "crawlers") are tiny and red.

      Female Scale

Appearance and Distribution of the Pest
This scale is found throughout the world.

Life Cycle
This insect has a Hemimetabolouslife cycle, ie. When the immature nymphsresemble the adults.
Females lay up to 40 eggs; two generations may be produced each year. Females live for up to one year, and several overlapping generations may appear on one plant. Stems may be completely covered by scale.

Male Scale

Period of Activity
Active throughout the year in warmer regions.

Damage Caused
Stems become encased in heavy infestations, causing loss of vigour and stunted growth.

Susceptible Plants
Typically found in encrustations on the stems and branches of roses, blackberries and raspberries.

Cultural Control
Remove and destroy heavily infested plants. Spray with white oil or soapy solution. Infestations on thick stems may be brushed off.

BiologicalControl
Predatory caterpillars may reduce numbers.

Chemical Control
Contact pesticides such as maldison are suitable in domestic infestations; in commercial settings, scale may be kept under control with applications of methidathion.
Note
Always read the label for registration details and direction of use prior to application of any chemicals.