Mussel Scale (Lepidosaphes ulmi)
Armoured scale insect forming mussel-shaped covers on bark and twigs.
Mussel scale (Lepidosaphes ulmi) is an armoured scale insect found on fruit trees and ornamentals. It forms elongated, mussel-shaped covers on bark and twigs, weakening branches and predisposing trees to other stresses. Biological control includes parasitoid wasps and predatory beetles, supported by promoting natural enemies and targeting crawler stages where possible.
Biological Controls for Mussel Scale (Lepidosaphes ulmi)
The options below are examples of beneficial insects and biological products commonly used against mussel scale (lepidosaphes ulmi). Always refer to supplier guidance and product labels for crop safety and local registration status.
Cryptolaemus montrouzieri
Product: Cryptoline
Environment: outdoor
Temperature Range: 16.0 – 28.0°C
Rate: 2–5 beetles per infested branch
Frequency: Repeat following season if required
Biocontrol contribution in fruit trees; combine with winter oils and pruning.
Related Biological Solutions
Growers dealing with mussel scale (lepidosaphes ulmi) often also monitor these pests as part of a complete IPM programme: