Low-Elevation Movement of Some Species of Aphids12

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Abstract
Movement of alate aphids at low elevations was studied for several yrs., including potato-infesting spp. (buckthorn, Aphis abbreviata; green peach, Myzus persicae, and potato, Macrosiphum solanifolii aphids), and the pea aphid, Macrosiphum pisi. For the potato-infesting spp. windvane traps one above another were operated near Presque Isle, Maine, while for the pea aphid tall tanglefoot screens were used at 2 places in Wisconsin and shorter ones at 3 places near Geneva, New York. Within the vertical 30-ft. trapping range in Maine catches of the buckthorn, green peach, and potato aphids reached a peak at 10-20, 10-25, and 15-25 ft., respectively. Pea aphid catches on the tall screens tended to peak at 17 ft. within the 29.5 ft. elevation sampled and between 3 and 8 ft. within the 10.5-ft. elevation covered by the short screens. Each of the potato-infesting spp. exhibited its own rather definite pattern of height distribution. Results suggest that short separations between fields will provide little protection from infestation or virus-disease spread by alate forms of these 4 spp. of aphid.