General comments
Ubiquitous.

The Large Yellow Underwing appears on every significant list of moths in Hertfordshire; indeed it would be a great surprise if even the briefest of lists obtained from July to September lacked it. A great many colour forms exist, but no data on the frequency of these appears to have been collated. Many forms were named by Tutt (1892). In some years, numbers may be boosted by primary immigration.

Recorded in 37 (90%) of 41 10k Squares. First Recorded in 1887. Last Recorded in 2024. Additional Stats

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