Effects of summer pruning and hand fruit thinning on obliquebanded leafroller (Lepidoptera : Tortricidae) fruit damage in New York state apple orchards

摘要

abstract_textpTwo commercially used horticultural practices, summer pruning and fruit thinning by hand, reduced fruit damage caused by the obliquebanded leafroller, Choristoneura rosaceana (Harris), in apple orchards in New York. Results of a 2-yr study indicate that fruit thinning by hand reduced fruit damage by 2-3 in large and small trees, whereas the use of summer prunning reduced fruit damage by 4-6 in large, vegetative trees. Summer pruning had no effect on fruit damage in small trees. Pruning early in the growing season can increase fruit damage and decrease flower production the following year. Hand fruit thinning increased fruit size, and summer pruning increased fruit color. These findings indicate that horticultural techniques commonly used in commercial apple production can be slightly modified to aid in the control of obliquebanded leafrollers./p/abstract_text