Thrips are very small insects that feed on pollen and developing fruit, causing small, seedy berries, bronzing between achenes, and occasionally cracked fruit.
The immature thrip cannot fly. Adult thrips have wings and can fly or move in air currents for long distances.
Since thrips hide within flowers, gently blowing on the flowers will cause thrips to emerge in response to carbon dioxide. More than 10 thrips per flower can cause economic damage.
Thrip feeding on fruit causes net-like russeting as they injure the surface of fruit. Cat-facing may also occur.
Following photos are courtesy of Kathleen Demchak, Penn State University.
More thrips information:
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