부산대학교 도서관

Insects representing 106 families were caught in pane traps placed adjacent to single-row Siberian elm windbreaks in north-central and eastern North Dakota. Tachinids, sarcophagids, heleomyzids, calliphorids, syrphids, and halictids accounted for 38%, 17%, 16%, 14%, 6%, and 3%, respectively, of the insects trapped in north-central North Dakota in this study. In eastern North Dakota, halictids and syrphids accounted for 47% and 34%, respectively, of all insects captured. Insect abundance by family varied between these two regions. Pane traps hung at a height of 1.5 m caught significantly more insects than those at 3.6 m. Catches of bombyliids and hemerobiids were significantly greater in traps placed at a height of 3.6 m and parallel to the windbreaks. Carbaryl and Bacillus thuringiensis had no effect on the abundance of most families of insects collected in pane traps. In north-central North Dakota, abundance of sarcophagids, coccinellids, calliphorids, and staphylinids varied with sample date but did not vary with treatment. Coccinellid abundance tended to decrease in all blocks immediately after treatment, but by 8 days after treatment their abundance had increased in the carbaryl-treated blocks. In eastern North Dakota trap catches of coccinellids, syrphids, halictids, and chrysopids varied among wind-breaks. Braconid abundance was significantly lower 8 days after treatment.