Hoplocampa testudinea Klug Apple sawfly

This sawfly is an important pest of apple. The larvae burrow singly within the developing fruitlets and produce masses of wet. black frass; this is exuded through a small hole (c. 1.5 mm in diameter) in the side of each infested fruitlet (cf. damage caused by codling moth, Cydia pomonella, p. 218, and fruitlet-mining tortrix moth. Pammene rhediella, p. 222). Attacked fruitlets remain small, are often deformed and are noticeably pubescent. They usually drop prematurely and crop losses can be considerable, particularly on susceptible dessert cultivars such as James Grieve and Worcester Pearmain. Attacked fruitlets sometimes bear long slit-like wounds that arise from the calyx; these indicate that the larva has failed to penetrate into the flesh. Such fruitlets often develop to maturity, with characteristic, corky, ribbon-like scars.

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