Abstract
Plant injury, minimum developmental rates, and survival studies of Spissistilus festinus (Say) were conducted on soybean, yellow nutsedge, prickly sida, and cocklebur under greenhouse conditions. Yellow nutsedge failed to show any potential as a host plant for the threecornered alfalfa hopper. Adults were observed feeding on prickly sida, and survival times were longer than on yellow nutsedge, but no eggs were found. Adults survived and reproduced on both cocklebur and soybean. Time required for the 1st nymphal stage to become adults on cocklebur was significantly longer than for soybean. The mean time in days for the 1st nymph to reach the adult stage on cocklebur was 26.8, compared to 18.7 on soybean. Insect feeding caused the greatest damage to soybeans, followed by cocklebur and prickly sida. The 4th instars were the most injurious developmental stage on soybeans, followed by the third, fifth, and adults. The 1st 2 nymphal stages fed by random punctures and caused no visible damage.
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