Full TGIF Record # 19357
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Publication Type:
Author(s):Potter, Daniel A.; Patterson, Cary; Redmond, Carl
Title:Resistance of cool-season turfgrasses to white grubs
Source:Kentucky Turfgrass Research. 1988, p. 30-31.
Publishing Information:Lexington, KY: University of Kentucky, College of Agriculture, Cooperative Extension Service
Series:Progress Report 319
Keywords:TIC Keywords: Festuca arundinacea; Festuca rubra subsp. rubra; Poa pratensis; Lolium perenne; Agrostis stolonifera; Endophytes; Melolonthinae; Cool season turfgrasses; Disease susceptibility; Cyclocephala lurida
Abstract/Contents:First report of test initiated in 1988 to evaluate relative susceptibility of different turfgrass species to white grub feeding, and to determine if fescue and ryegrass endophytes convey partial resistance to grubs. Japanese beetle and masked chafer (Cyclocephala lurida) grubs were reared in turf plugs of six grass species, and weight gain and survival were compared. Suitability of grass species for grubs was further studied by feeding the insects small quantities of pre-weighed root tissue in ice cube trays, and studying their feeding rates and weight gain over time. Finally, the potential toxic alkaloids present in endophyte-infected tall fescue were extracted and mixed in minute concentrations into artificial diet to study their effects on grubs. Weight gain results indicate: 1) Tall fescue, which is generally regarded as relatively resistant to grubs, appears to be just as suitable as Kentucky bluegrass as a food resource. These results, which were supported by the other feeding tests, suggest that the resistance of endophyte-free tall fescue is probably due to tolerance of grub damage rather than to inherent superiority of bluegrass roots as food. 2) Grubs grew significantly more slowly on tall fescue with endophyte, suggesting that the fungus may convey some partial resistance to grubs. Laboratory tests with the fescue alkaloids suggest that they are repellent to grubs at rates lower than what is present in roots of endophyte-infected plants. Other trials suggest that endophyte-free perennial ryegrass may be especially susceptible to grubs. These conclusions are preliminary, and more work will be needed before the relative susceptibility of different turfgrasses to grub problems can be predicted.
ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Potter, D. A., C. Patterson, and C. Redmond. 1988. Resistance of cool-season turfgrasses to white grubs. KY. Turfgrass Res. p. 30-31.
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