This series of photos demonstrates how caged (top) and uncaged (bottom) soybean plants were artificially infested with aphids. Once infested, all predators were removed from the cages. Cages were designed so that plants could be examined throughout the 2-week experiment. The number of aphids on each plant was counted every 3 to 4 days and the average number of aphids on 16 caged and 16 uncaged plants was calculated. See results.