Snowberry clearwing

Systematic position: The Snowberry clearwing (Hemaris diffinis) belongs to the order Lepidoptera and the family Sphingidae (hawk moths). This insect is notable for its clear wing patches and bee-like appearance, which often leads to confusion regarding its role in the garden ecosystem.

Host plants and damage: The primary hosts for the larvae include various species of honeysuckle (Lonicera) and snowberry (Symphoricarpos). While adult moths are pollinators, the larvae can cause localized damage to the foliage of these ornamental shrubs.

Biology and life cycle: Like all hawk moths, Hemaris diffinis undergoes complete metamorphosis. Females lay eggs individually on the leaves of host plants. After hatching, the larvae feed actively throughout the summer months. The species typically overwinters as a pupa, usually in a loose cocoon found within leaf litter or just below the soil surface.

Character of damage: The caterpillars are responsible for defoliation. As they grow, their consumption rate increases significantly. Severe infestations can lead to partial or complete loss of leaves on individual branches, which can stress the host plant and decrease its aesthetic value in landscape design.

Control measures: Effective management of this pest focuses on non-chemical practices to preserve the garden's ecological balance:

• Manual removal of caterpillars from foliage when populations are low.
• Promoting a healthy environment for birds and predatory insects that feed on larvae.
• Utilizing organic insecticides such as Bacillus thuringiensis only when an outbreak occurs.
• Cleaning up leaf debris around the base of host plants in late autumn to reduce pupal survival rates.