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| Publication Type:
| Report |
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| Author(s): | Potter, D. A. |
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| Title: | Influence of feeding by masked chafer grubs on quality and yield of Kentucky bluegrass |
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| Source: | Kentucky Turfgrass Research. 1981, p. 15-17. |
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| Publishing Information: | Lexington, KY: University of Kentucky, College of Agriculture, Cooperative Extension Service |
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| Keywords: | TIC Keywords: Poa pratensis; Quality evaluation; Cyclocephala lurida; Irrigation; Injuries by insects; Visual evaluation; Clipping weight; Survival
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| Abstract/Contents: | Study to quantify the feeding impact of southern masked chafer grubs on the quality and yield of Kentucky bluegrass turf. In experiments conducted over 2 summers, 96 galvanized steel enclosures, measuring 1 ft2 in area, were driven into the sod to 4" depth. Enclosures were infested with 0, 3, 6, 12, 24, or 48 late 2nd or early 3rd instar grubs collected from a golf course. Half of the enclosures were irrigated twice a week; the remainder were not watered. Every 2 weeks, enclosures were visually ranked on the basis of quality, and then clippings were harvested, dried and weighed as a measure of yield. At the end of the experiment, surviving grubs were counted and weighed. Tables provide visual rankings of turf quality, clipping yield, and grub survival with significant differences indicated. Initial densities of 24-48 grubs/sq. ft. caused significant reductions in quality of turf after only 2 weeks. Infested turf that was irrigated tended to outgrow the damage by the end of the study (mid-October), while non-watered turf did not recover. By the 6th week of feeding, grub densities of 24-48/sq. ft. reduced growth by up to 65% in non-irrigated plots. Regular irrigation masked the effects of grub feeding, and little damage occurred in irrigated plots with 24 or less grubs/sq. ft. Irrigated turf with 48 grubs/sq. ft. actually had greater total clipping yield than did uninfested turf that was not watered. On the basis of this experiment, it appears that where soil moisture is adequate, the tolerable level of masked chafer grubs is much higher than the usual rule-of-thumb estimate of 6-8 grubs/sq. ft. These data suggest a damage threshold of at least 10-14 grubs/sq. ft. for established Kentucky bluegrass turf. |
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| Language: | English |
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| References: | 0 |
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| Note: | Tables |
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| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Potter, D. A. 1981. Influence of feeding by masked chafer grubs on quality and yield of Kentucky bluegrass. KY. Turfgrass Res. p. 15-17. |
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