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This article in CS

  1. Vol. 26 No. 6, p. 1151-1153
     
    Received: Jan 16, 1986


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doi:10.2135/cropsci1986.0011183X002600060014x

Greenbug Nonpreference for Bloomless Sorghum1

  1. D. E. Weibel and
  2. K. J. Starks2

Abstract

Abstract

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.

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