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Greenbug Nonpreference for Bloomless Sorghum¹

Greenbugs [Schizaphis graminum (Rondani)] attack sorghum plants [Sorghum bicolor (L.) Moench] every year, causing damage and reduced yields. Bloomless sorghum (lack of white, waxy exudate on leaf sheath) is a nonpreferred host to greenbug biotype C. The purpose of this research was to determine the age at which bloomless and sparse-bloom sorghum plants become nonpreferred hosts to greenbug biotype C. Greenbugs were counted on near-isogenic pairs of lines over a period of several weeks. Data from 2 yr indicated that bloomless plants 4 weeks old were nonpreferred hosts by the greenbug. It was concluded that bloomless plants 4 weeks of age could protect themselves and reduce the need for chemical control. Sparse-bloom plants 4 weeks old were less preferred hosts than normal bloom sorghum plants, and probably could not protect themselves as well as bloomless plants.

Key Words: Sorghum bicolor (L.) Moench • Schizaphis graminum (Rondani) • Sparse-bloom • Isogenic lines • Plant resistance

² Professor, Dep. of Agronomy; research entomologist, USDA-ARS, Oklahoma State Univ., Stillwater, OK 74078.

Received for publication January 16, 1986.