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.
Iron chelates, iron salts, and acid-treated mine tailings significantly increased turfgrass greening of Kentucky bluegrass (Poa pratensis L.) when compared to control plots. Turf treated with iron salts and acid mine tailings after 384 days were significantly darker green than those treated with chelates. There was a positive correlation between turf color, total leaf iron, and chlorophyll 17 days after treatment, but not after 384 days.
Twenty-one Kentucky bluegrass (Poa pratensis L.) cultivais differed significantly in their thatching tendency during 4 years of study. ‘Glade’, ‘Cheri’, and ‘Victa’ accumulated the most thatch, while ‘S-21’, ‘A-34’, and ‘Park’ accumulated the least. Increasing mowing heights from 2.5 cm to 5.0 cm significantly increased the tendency to accumulate thatch. Increasing nitrogen nutritional levels from 10 g m−2 to 20 g m−2 did not increase thatching tendency.
Sods of ‘Merton’ Kentucky bluegrass (Poa pratensis L.) were placed in atmospheres containing 0, 9, 18, or 27% CO2; 0, 2, 4, 8, or 16% O2; and 0, 2, 4, or 8 ppm C2H4. Neither CO2 nor C2H4 toxicity nor O2 deficiency caused sod injury in commercial sod toads. Ventilation tubes inserted in commercial sod toads failed to increase gas exchange and heat dissipation beyond a 3-cm distance.
( Gill and Rainville, 1994 ). NaCl is the principal soil salinity stress ( Yokoi et al., 2002 ). Kentucky bluegrass ( Poapratensis L.) is a cool-season grass widely used for home lawns, sport fields, and commercial landscapes in temperate climates
The effects on Kentucky bluegrass (Poa pratensis L.) turf quality of mowing with either a mulching mower or a conventional rotary mower, having clippings re moved or returned, were determined. Turf that received 0, 150, or 300 kg N ha–1 yr–1 was mowed at 5 cm either biweekly, weekly, or twice weekly. Turf quality, weed encroachment, and thatch buildup were monitored. Highest quality was found where turf was mowed twice weekly with a conventional rotary mower with clippings returned and received 300 kg N ha–1 yr–1. Quality ratings for turf mowed with the mulching mower were equal to or significantly lower than ratings for turf mowed with a conventional rotary mower with clippings returned on 13 of the 17 rating dates. Thatch buildup and weed encroachment responded to N level, with more thatch and fewer weeds at the highest N level.
perenne L.), kentucky bluegrass ( Poapratensis L.), and tall fescue. Research demonstrated consistently that sequential mesotrione applications provide more CBG control than single applications ( Branham et al., 2005 ; Dernoeden et al., 2008 ; Jones
This field study was conducted to evaluate soil compaction stress effects on 20 Kentucky bluegrass (Poa pratensis L.) cultivars. Compaction stress reduced lateral spread of most cultivars with none having greater spread in compacted than in non-compacted soil. ‘Vantage’, ‘Cheri’, and ‘Merion’ maintained the same lateral growth under both conditions. Compaction increased stem rust (Puccinia graminis Pers.) incidence, particularly for stem rust susceptible and moderately susceptible cultivars.
Rate of coverage from plugs of ‘A-20’ Kentucky bluegrass (Poa pratensis L.) planted in Flanagan silt loam and treated with oxadiazon at 3.4 kg/ha increased as mowing height increased from 1.9 to 3.8 to 7.5 cm and with fertilization at 25 kg N/ha per growing month or higher. Sod strength measurements taken 2 years after planting were highest in plots receiving 25 kg N/ha per growing month compared to 0, 50, and 100 kg. Where plugs of 48 cultivars of Kentucky bluegrss received the same oxadiazon treatment, phytotoxicity ranged from no injury to complete necrosis.