Abstract
The degree of damage and the time of injury by fruit-piercing stink bugs was investigated in various apple cultivars (Malus pumila Mill. var. domestica Schneid.). In 1996, the degree of damage by stink bugs was significantly high in the early-harvest cultivar, Sansa and the mid-harvest cultivars, Starking delicious and Hokuto. In 1998, the damage by released Halyomorpha halys (Stål) was investigated every 10 days from 10 June to 20 September and shown to be heavier in early- and middle-harvest cultivars than in late-harvest cultivars. These results suggest that the degree of damage by stink bugs differed among apple cultivars even if the apple fruits were damaged at the same time within an year.
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