A local south-eastern and central southern England species, the larva feeding for two years within slender sallow (Salix spp.) stems up to 12 mm in diameter. For the first year there is little external evidence of the larva. However, by the second winter, a gall up to 25mm long forms from the bulbous thickening of the sallow stem. This internal activity often kills the stem above the gall. Mortality of larvae at this time is high as blue tits and related species target the galls and ichneumon... Read More

Recorded in 9 (23%) of 40 10k Squares. First Recorded in 1929. Last Recorded in 2022. (Data up to end 2023) Additional Stats

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