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Control of Poa annua by Suppression of Seedheads with Growth Regulators

Published online by Cambridge University Press:  12 June 2017

T. L. Watschke ,
F. W. Long  and
J. M. Duich
J. M. Duich
Affiliation:
Pennsylvania State Univ., University Park, PA 16802
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Abstract

Field and greenhouse studies were conducted to determine the degree to which annual bluegrass (Poa annua L.) could be controlled by inhibiting seedheads. The materials used were: MH (1,2-dihydro-3,6-pyridazinedione); chlorflurenol (methyl 2-chloro-9-hydroxyfluorene-9-carboxylate), plus methyl 9-hydroxyfluorene-9-carboxylate, and methyl 2,7-dichloro-9-hydroxyfluorene-9-carboxylate; and endothall [7-oxabicyclo (2.2.1) heptane-2,3-dicarboxylic acid]. The effects of these materials on pollen quality and the viability of seed produced by treated plants were also determined. For all chemicals used, multiple applications at low rates resulted in better seedhead inhibition than single treatments at higher rates and their effects lasted longer. However, treatments that inhibited seedheads by an amount predicted to reduce annual bluegrass (more than 75%) often caused objectionable foliar discoloration. Endothall, particularly the granular formulation, caused excessive injury at all rates. All growth regulators reduced the number of seed produced, which affected the number of seeds that germinated from soil that was taken from treated plots. The number of seed found in the soil was sufficient to allow the stand to be self-perpetuating. All treatments reduced the percentage of fertile pollen, however, this reduction was not significant because the germination of seed harvested from treated plants was not reduced significantly. Even though these treatments reduced seedheads significantly, the population of annual bluegrass the following year was not reduced.

Keywords

Seedhead inhibitionPoa pratensisAgrostis palustrisMHendothall
Type
Research Article
Information
Weed Science , Volume 27 , Issue 2 , March 1979 , pp. 224 - 231
Copyright
Copyright © 1979 by the Weed Science Society of America 

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References

Literature Cited

1. Engel, R. E. and Aldrich, R. J. 1955. Control of annual bluegrass (Poa annua) in fairway-type turf. Proc. Northeast. Weed Control Conf. 9:353–355.Google Scholar
2. Goss, R. L. and Zook, F. 1971. New appraoch for Poa annua control. The Golf Superintendent. 39:46–48.Google Scholar
3. Maestri, N. and Currier, H. B. 1958. Interaction of maleic hydrazide and endothall. Weeds 6:315–326.Google Scholar
4. Sass, J. E. 1951. Botanical microtechnique. 2nd ed. The Iowa State College Press, Ames, Iowa. 228 pp.Google Scholar
5. Sharma, A. K. and Sharma, A. 1972. Chromosome techniques. 2nd ed. Baltimore, Maryland: Butterworth & Co. Ltd., London and University Park Press, Baltimore, Maryland. 575 pp.Google Scholar
6. Turgeon, A. J. and Meggitt, W. F. 1971. Role of endothall in control of annual bluegrass. Proc. Northeast. Weed Sci. Soc. 25:399.Google Scholar
7. Turgeon, A. J., Meggitt, W. F., and Penner, D. 1972. Role of endothall in the control of annual bluegrass in turf. Weed Sci. 20:562–565.Google Scholar
8. Waller, R. A. and Duncan, D. B. 1969. A Bayes rule for the symmetric multiple comparisons problems. J. Am. Stat. Assoc. 64:1484–1503.Google Scholar