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  • Author or Editor: A. H. Bruneau x
  • HortScience x
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Abstract

A cultivar and blend trial of Kentucky bluegrass (Poa pratensis L.) demonstrated differential cultivar responses to larval infestation and injury by bluegrass billbug (Sphenophorus parvulus Gyllenhal). Correlation between billbug injury ratings and billbug larval density was r = 0.92. Injury ratings and larval density for blends approximated mean response for cultivars in pure stands. These results suggested that blending could be beneficial in reducing injury symptoms, if appropriate cultivars were selected.

Open Access

Abstract

Sixty Kentucky bluegrass (Poa pratensis L.) cultivars and experimental lines and 24 bluegrass blends were investigated for thatching tendency. Cultivars and experimental lines differed in thatch accumulation during the course of this 5-year study. Increasing N level from 10 to 20 g N m-2 season -1 had no effect on thatch accumulation. Thatch accumulation in cultivars and experimental lines was correlated (r = 0.87) to verdure, indicating vigorous cultivars had greater thatching tendency. Thatching tendency of cultivars was correlated (r = 0.74) to their total cell-wall content expressed on a mg dm-2 basis. Accumulation of thatch in blends approximated the mean accumulation for cultivars growing in pure stands. These results indicate a potential for reducing thatch accumulation in Kentucky bluegrass lawns through blending of appropriate cultivars.

Open Access

Abstract

A trial of 38 cultivare of Kentucky bluegrass (Poa pratensis L.) demonstrated genetic differences to an infestation of bluegrass billbug. The correlation coefficient between injury ratings and billbug larval density in sod samples was r = 0.73. Thatch accumulation was not significantly correlated (r = 0.31) with billbug density.

Open Access