Full TGIF Record # 11675
Item 1 of 1
Publication Type:
i
Report
Content Type:Abstract or Summary only
Author(s):Brede, A. D.
Author Affiliation:Dept. of Horticulture and Landscape Architecture, Oklahoma State University, Stillwater, OK.
Title:Competitive Interactions of Seedling Poa annua in Turf
Meeting Info.:Held: January 14-16, 1985, Houston, TX.
Source:Proceedings of the 38th Southern Weed Science Society. Vol. 38, 1985, p. 95.
Publishing Information:Southern Weed Science Society
Keywords:TIC Keywords: Poa annua; Interactions; Competition; Seedlings; Poa pratensis; Lolium perenne; Bent versus Poa; Agrostis stolonifera
Abstract/Contents:"Annual bluegrass (Poa annua L.) is one of the most difficult weeds to control in turf. Its morphology and physiology are quite similar to perennial turf species, and no effective herbicides presently exist for its selective control in cool-season turfs. The purpose of this study was to examine P. annua growth and competition in the field in association with other perennial cool-season turf species in hopes of developing management practices to minimize P. annua encroachment. A series of studes were performed in two locations: Pennsylvania (cool-humid) anbd Oklahoma (warm-semi-arid). During 1981, a study was initiated in State College, PA, to examine the seasonal growth of P. annua with respect to two other cool-season grasses. P. annua growth was monitored from seeded plantings and from transplanted tillers over a period of one entire growing season. Vegetative growth of P. annua was most intense from early autumn plantings, compared with Kentucky bluegrass P. pratensis L.) and perennial ryegrass (Lolium perenne L.). P. annua vegetative growth was at a minimum, relative to L. perenne, during June when the P. annua was entering anthesis. Thus, L. perenne could be expected to be more competitive with P. annua in plantings made during this time. Two experiments were initiated in Stillwater, OK, in October, 1984, to investigate the competitive relationships between P. annua and creeping bentgrass (Agrostis palustris Huds.), the predominant grass species used on golf course putting greens in this country. When A. palustris seeds were planted in the field, surrounded by P. annua seeds, the field survival of the A. palustris decreased with increasing seed density of the P. annua. Regression analysis was used to predict the field survival of A. palustris: FS = 64 - 0.68 (Bin) - 0.63 (Pout) + 0.0005(Pout)3, where FS = % A. palustri field survival, Bin = A. palustris seeds/0.05 dm2, and Pout = P. annua seeds/0.05 dm2. The field survival of P. annua grown in the field surrounded by other P. annua plants was found to steadily increase with an increase in the density of the surrounding plants. The regression equation was: FS = 45 - 0.93 (Pin) + ).0002 (Pout)3 where FS = % P. annua field survival, Pin - P. annua seeds/0.05 dm2 in surrounding the isolated plot, and Pout = P. annua seeds/0.05 dm2 surrounding the isolated plot. The latter increase was interepreted as a sheltering effect on the isolated plot by the surrounding stand. Laboratory screenings suggested that the cause of the decreased field survival associated with P. annua may lie with allelopathic chemicals given off by the P. annua."
Language:English
References:0
Note:This item is an abstract only!
ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Brede, A. D. 1985. Competitive Interactions of Seedling Poa annua in Turf. Proc. Meet. South. Weed Sci. Soc. 38:p. 95.
Fastlink to access this record outside TGIF: https://tic.msu.edu/tgif/flink?recno=11675
If there are problems with this record, send us feedback about record 11675.
Choices for finding the above item:
Find Item @ MSU
MSU catalog number: SB 611 .S6 v.38
Request through your local library's inter-library loan service (bring or send a copy of this TGIF record)