This widely distributed and locally common pest occurs on various rosaceous trees and shrubs (Rosaceae), including ornamentals and fruit trees, especially cherry and pear. Larvae (known as 'pear & cherry slugworms') graze away patches of tissue on the upper surface of leaves and sometimes cause extensive damage that may lead to premature leaf-fall. Badly affected foliage appears scorched.
Adults of this mainly parthenogenetic species first appear in late May and June. Eggs are then deposited in the underside of leaves of host plants. The relatively sedentary, slow-moving larvae feed and rest openly on the upper surface of leaves. They may be found throughout the summer months and into the early autumn. Pupation occurs in the soil, each larva forming a small black cocoon about 10 cm below the sur
face. There are usually two, sometimes more, generations each year.
Adult 4-6 mm long, black and shiny. Larva up to 10 mm long; body pyriform, distinctly swollen anteriorly (Fig. 331), greenish-yellow to orange-yellow but covered in a shiny olive-black slime; thoracic legs inconspicuous; abdominal prolegs seven pairs present.
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