Abstract
Population density of Schizaphis graminum (Rondani) was manipulated by use of insecticide to assess damage to early and medium-late maturity type grain sorghum hybrids. Lower greenbug numbers and fewer dead leaves per plant were required to cause yield reductions of an early maturing hybrid than a later maturing one. Greenbug numbers of ca. 1000 and leaf death >2/plant on an early maturity grain sorghum resulted in a yield reduction. Conversely, greenbug numbers of ca. 3000 and leaf death of >3/plant on a medium-late maturity grain sorghum resulted in a significant yield reduction.
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