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  1. Vol. 16 No. 2, p. 265-267
     
    Received: May 30, 1975
    Published: Mar, 1976


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doi:10.2135/cropsci1976.0011183X001600020026x

Evaluation of Greenbug Resistance in S2 Progenies of Grain Sorghum1

  1. K. D. Kofoid,
  2. W. M. Ross,
  3. H. L. Hackerott,
  4. T. L. Harvey and
  5. S. D. Kindler2

Abstract

Abstract

The relationship of greenbug [Schizaphis graminum (Rondani)] resistance to various agronomic traits was evaluated by testing 100 greenbug.resistant and 100 greenbug- susceptible S2 progenies derived from the same grain sorghum [Sorghum bicolor (L.) Moench] random-mating population. Data collected in the absence of greenbug infestation indicated that no differences existed between the two populations for any of the traits studied.

The same entries tested in the presence of a greenbug infestation showed the mean of the resistant population to be significantly greater for height, grain yield, grain wt/plant, grain wt/head, and live leaves/plant; and significantly less for greenbug mummies/plant, dead leaves/ plant, and damaged leaves/plant. Thus greenbug resistance had no deleterious effects upon any of the agronomic traits studied; and in the presence of greenbug feeding, resistance enhanced the agronomic acceptability

Ample variability existed within each population for improvement by selection of any of the traits studied.

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