This section is from the book "Commercial Gardening Vol3", by John Weathers (the Editor). Also available from Amazon: Commercial Gardening, A Practical & Scientific Treatise For Market Gardeners.
The larvae of this small moth form circular brown blisters on Pear and sometimes Apple leaves. The moth appears at the end of April and May, and again in July and August. The moth has leaden-grey forewings with a brown streak running from the costa obliquely across the wing; also two white streaks run from the costa nearer the tip separated by a coppery band; beneath these a black spot with a violet pupil, fringe dingy with four dark radiating lines. Wing expanse 1/4 in.