This widely distributed and generally common univoltine insect is a minor pest in orchards and hop gardens. The adults pierce the upper surface of the foliage to form small greenish-yellow marks that eventually turn brown. This symptom, which was once thought to be due to a fungal pathogen, is often known as 'angular leaf spot'. On pear, damage is restricted to the fruitlets and fruit stalks, these becoming marked
with corky blemishes. Nymphs, each sheltered by a mass of 'spittle', develop mainly on the roots of Rumex and various other herbaceous plants. The adults (10-11 mm long), which have distinctive black and red forewings (Fig. 183) occur from May or June onwards.
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