Abstract
Larval and egg mass sampling along with a sex pheromone trap grid consisting of 105 traps spaced 200 by 140 m apart were used to study the population biology of the tortricid, Platynota idaeusalis (Walker), among pome and stone fruits in Adams County, Pa. Overwintering and summer populations were found beneath apple, pear, peach, and cherry on a wide variety of herbaceous plant species, especially Taraxacum officinalis, Rumex obtusifolius , and root suckers. In apple, larvae were found overwintering primarily beneath the tree canopy within 2 m of the trunk. Significantly more first-brood larval shelters were found on apple than on cherry, peach, or pear. However, the highest density of second-brood egg masses and male trap counts were found in cherry. No differences were found in second-brood egg mass density among five of the six apple cultivars sampled. Significantly higher fruit injury levels were found for ‘Yorking’ and ‘Rome Beauty’ than for ‘Delicious’, ‘Golden Delicious’, ‘Stayman’, and ‘Jonathan’. Fewer moths were caught in pheromone traps placed in fields and wooded sites than in orchards. Recapture of marked moths demonstrated that males moved throughout the study site.
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