Emergence of adult flatheaded apple tree borers, Chrysobothris femorata (Olivier), from red maple (Acer rubrum L.) trees and cut bolts was monitored in central Kentucky from 1984–1986. A forecasting system based on accumulated degree-days (DD) was developed for predicting optimum treatment dates. Date of first emergence ranged from May 8 to June 6, corresponding to a mean accumulation of 412 Centigrade DD (742 F DD) calculated from a base temperature of 10°C (50°F). A single application of lindane or chlorpyrifos applied soon after adult borers began to emerge protected young red maple trees from infestation. Adult C. femorata were trapped in nurseries from May until August. Twenty-five species of adult Buprestidae representing 5 genera were attracted to experimentally stressed red maples. Although results were variable, stressed trees were generally more attractive and/or susceptible to borers.
Kentucky Agricultural Experiment Station Journal Series Paper 87-7-148. Research supported in part by the 1985 AAN Centennial Research Grant administered by the Horticultural Research Institute Inc., Endowment Fund, 1250 I Street, N.W., Suite 500, Washington, DC 20005 and by a grant from the International Society of Arboriculture Research Trust.
2Associate Professor of Entomology
3Horticultural Consultant, 9219 Old Henry Rd., Louisville, KY 40223
4Former Research Technician. Present Address: Tru Green Corp., 812 Pickens Industrial Drive, Marietta, GA 30062