Feeding behavior, development, and damage by biotypes B, C, and E of Schizaphis graminum (Homoptera: Aphididae) on 'Wintermalt' and 'Post' barley
1988
Peters, D.C. | Kerns, D. | Puterka, G.J. | McNew, R.
Greenbug, Schizaphis graminum (Rondani), biotypes B, C, and E, were monitored on susceptible 'Wintermalt' and resistant 'Post' barley to determine if there were behavioral differences among the biotypes when they fed on resistant and susceptible barley. All biotype-cultivar combinations were tested by observing feeding behavior, fecundity, and damage. Greenbug biotype B had shorter nonfeeding times on the host plant before probing than did biotypes C and E. Biotype B appeared to be less successful in feeding from the phloem of susceptible 'Wintermalt' but was relatively more successful than biotypes C and E on the resistant 'Post'. Development, reproduction, and particularly dry weight of biotype B were inferior to biotypes C and E on both resistant and susceptible plants. However, biotype B caused the greatest overall reduction in chlorophyll content of infested leaves and should be considered the most virulent but least biologically fit of the three biotypes in these comparisons.
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