Small Winter Moth
Operophtera brumata
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How to spot it
You will notice the Small Winter Moth in spring by its green caterpillars that, when crawling, have a cat's hump appearance. They bore into buds, flowers, and young leaves from the shoot and leave holes. The females are wingless and walk up the trunks in mild late autumn to lay their eggs on the buds. When they multiply in large numbers, only the leaf veins remain on young shoots.
Prevention
You can place glue rings around the trunk and stakes from the end of September to catch the upward‑moving females before they lay eggs, and renew the glue when it gets dirty throughout the whole autumn. Encourage tits with nest boxes, one brood can kill thousands of caterpillars, and shake the caterpillars onto a spread sheet in the morning when feeding starts; a Bacillus thuringiensis spray helps against young caterpillars when infestation is heavy.
Affected plants
These plants in our database are especially susceptible.
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