Abstract
Planthoppers Sogatella kolophon (Kirkaldy) and Delphacodes idonea Beamer were reared on torpedo grass, Panicum repens L., in the laboratory. Egg incubation periods averaged 11.0 and 10.0 d for S. kolophon and D. idonea, respectively. Total nymph periods were 20.3 d for S. kolophon and 16.8 d for D. idonea. Adult longevity for S. kolophon and D. idonea was 18.4 and 9.4 d, respectively. Immature stages of both species are described and illustrated and a key is provided to separate instars.
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