SEASONAL PATTERNS OF FLIGHT AND ATTACK OF MAPLE SAPLINGS BY THE AMBROSIA BEETLE CORTHYLUS-PUNCTATISSIMUS (COLEOPTERA, SCOLYTIDAE) IN CENTRAL MICHIGAN

Window traps with ethanol were used to observe seasonal f light patter ns of Corthylus punctatissimus in central Michigan. Flights peaked in early July with a second peak seven weeks later in late August. Simila rly, wilting of attacked maple (Acer) saplings began to appear a week after initial Corthylus flights, and showed two peaks, one in mid-July and again with another peak, seven weeks later, in early September. T he second peak of activity is presumably from reemerged adults, and no t a second generation.