Download or read book The Role of 7 oxabicyclo 2 2 1 heptane 2 3 dicarboxylic Acid Endothall in Annual Bluegrass Poa Annua L Control in Turf written by Alfred J. Turgeon and published by . This book was released on 1971 with total page 202 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Role of 7 oxybicyclo 2 2 1 heptane 2 3 dicarboxylic Acid endothall in Annual Bluegrass Poa Annua L Control in Turf written by Alfred J. Turgeon and published by . This book was released on 1971 with total page 236 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Role of 7 oxabicyclio 2 2 1 Heptane 2 3 dicarboxylic Acid endothall in Annual Bluegrass poa Annua L Contron in Turf written by Alfred J. Turgeon and published by . This book was released on 1971 with total page 202 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Bibliographies and Literature of Agriculture written by and published by . This book was released on 1978 with total page 748 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Turfgrass Bibliography from 1672 to 1972 written by James B Beard and published by . This book was released on 1977 with total page 744 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Comprehensive Dissertation Index written by and published by . This book was released on 1973 with total page 1244 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Comprehensive Dissertation Index 1861 1972 Agriculture written by Xerox University Microfilms and published by . This book was released on 1973 with total page 1226 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book National Union Catalog written by and published by . This book was released on 1978 with total page 616 pages. Available in PDF, EPUB and Kindle. Book excerpt: Includes entries for maps and atlases.

Download or read book Annual Bluegrass Poa Annua L written by and published by . This book was released on 1978 with total page 40 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Comprehensive Dissertation Index 1861 1972 Author index written by Xerox University Microfilms and published by . This book was released on 1973 with total page 1116 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Annual Bluegrass Poa Annua L and Its Requirements for Growth written by Howard Bennett Sprague and published by . This book was released on 1937 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Use of Mesotrione for Annual Bluegrass Poa Annua L at Cool season Turfgrass Establishment written by Katelyn A. Venner and published by . This book was released on 2011 with total page 56 pages. Available in PDF, EPUB and Kindle. Book excerpt: Annual bluegrass is a problematic weed in highly maintained turfgrass environments, and is difficult to control due to its adaptability to highly maintained turfgrass environments and lack of highly effective chemical control options. Mesotrione is a relatively new herbicide which has been found to show some level of control of annual bluegrass, and is safe to use at cool season turfgrass establishment. Thus, mesotrione has potential to be utilized for weed control in cultivated sod production. The objectives of this research were to evaluate mesotrione to determine: 1) tolerance of selected tall fescue cultivars, an important turfgrass species cultivated for sod, to applications of mesotrione; 2) the length of residual of mesotrione versus prodiamine, bensulide and dithiopyr for control of annual bluegrass; and 3) potential of mesotrione to control winter annual broadleaf weeds at Kentucky bluegrass establishment. Tall fescue cultivars were found to be tolerant to mesotrione applications made preemergence and preemergence plus 4 weeks after emergence at higher rates than required for weed control. Significant cover reductions were only observed at the 1.12 kg ha-1 application rate of mesotrione, which is four times the highest labeled rate for weed control. There was little difference in the response of the seven tall fescue cultivars iii evaluated suggesting minor intraspecific variability between tall fescue cultivars to mesotrione. When applied to bare ground, mesotrione provided 48% annual bluegrass control in the fall and annual bluegrass control decreasing to 20% in the following spring. Prodiamine, bensulide and dithiopyr provided much greater levels of annual bluegrass control and high levels of control were maintained into the following spring. These results suggest that although mesotrione has some activity on newly germinating annual bluegrass it is much lower relative to prodiamine, bensulide and dithiopyr. Mesotrione was found to be more effective for winter annual broadleaf weed control when applied POST compared to PRE. For overall winter annual broadleaf weed control mesotrione should be applied PRE at rates of 0.21 kg ha-1 or higher and POST at 0.14 kg ha-1 or higher. The results of these studies demonstrate that mesotrione is safe for use in newly seeded tall fescue and previous studies have shown similar findings with Kentucky bluegrass. The safety of mesotrione to these two economically important turfgrass species widely grown for cultivate sod combined with its ability to control winter annual broadleaf weeds and suppress annual bluegrass demonstrate that is a new and valuable component to an overall weed control program in cultivated sod production.

Download or read book Annual Bluegrass Poa Annua L Control in Turf with Ethofumesate written by Carol J. Maggard and published by . This book was released on 1983 with total page 168 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Management of Annual Bluegrass Poa Annua L Using Post emergence Herbicides and Plant Growth Regulators written by John B. Haguewood and published by . This book was released on 2014 with total page 101 pages. Available in PDF, EPUB and Kindle. Book excerpt: Annual bluegrass (Poa annua L.) is a problematic weed species found in many turfgrass stands, particularly golf course putting greens. This weed is light green in color, has poor heat and drought tolerance, and produces many seeds making it undesirable on putting greens. The objectives of this research were to: a) investigate the use of the herbicide bispyribac-sodium alone or in combination with plant growth regulators for annual bluegrass control and putting green tolerance; b) determine the efficacy of plant growth regulators on annual bluegrass seedhead suppression when applied once, or followed by a sequential application; and c) determine how chemicals applied at different growth stages of annual bluegrass effect shoot growth and seedhead development. Field and greenhouse research was conducted during 2010, 2011, 2012 and 2013 at multiple golf courses throughout central Missouri. Treatments of bispyribacsodium alone or in combination with paclobutrazol demonstrated safety to putting greens with high levels of annual bluegrass control (90%). For seedhead suppression, treatments containing ethephon were most effective, resulting in up to 95% suppression of seedheads. Regardless of plant stage during application, annual bluegrass biomass was reduced 19 and 31% following applications of ethephon + trinexapac-ethyl or paclobutrazol, respectively.

Download or read book The Allotetraploid Evolutionary Origin of Annual Bluegrass written by Qing Mao and published by . This book was released on 2014 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Poa annua L., or annual bluegrass, is an agronomically and ecologically important grass species. It is morphologically highly variable, representing a continuum from annual to perennial types. In order to explain the wide distribution and variability in Poa annua, efforts have been made to discover its evolutionary origin ever since the 1930s; however, no definitive conclusions have been made. Our phylogenetic analysis using nuclear and chloroplast gene sequences is the first to confirm that Poa annua (2n=4x=28) is an allotetraploid between an annual grass species Poa infirma Kunth. (2n=2x=14) and a perennial grass species Poa supina Schrad. (2n=2x=14), with the former serving as the maternal parent. Our data also suggest a recent origin of Poa annua, and possibly multiple crosses between the parental species led to the present day Poa annua. Previous phylogenetic studies have suggested that the genomes of Poa infirma and Poa supina are very divergent, representing the largest genetic distance between species within the genus Poa. By analyzing meiotic chromosome pairing data in amphihaploid Poa annua published by Hovin, we were able to determine that the genomes of Poa infirma and Poa supina indeed are very distinct, and we designated them II and SS, making the genomic constitution of Poa annua IISS.Prior to the present study, the biggest controversy on the origin of Poa annua was that its karyotype did not match the combination of the two putative parents Poa infirma and Poa supina. With the two parental species confirmed with DNA sequencing data, it could now be concluded that chromosomal rearrangements must have occurred during the evolutionary origin of Poa annua. In order to explore the extent and patterns of chromosomal rearrangements in Poa annua, fluorescent in situ hybridization was performed to compare rDNA loci in Poa annua and its parents. Our data show variations of genomic rDNA loci between Poa annua and its parents, and among different Poa annua individuals, suggesting that not only did chromosomal rearrangements occur in Poa annua, but also genomic variation exists within this species.Small RNAs play a wide range of regulatory roles in plant development and are associated with polyploid evolution. Four small RNA profiles were generated from young seedlings of Poa infirma, Poa supina, perennial-type Poa annua and annual-type Poa annua. Analyses showed that the four profiles are highly similar in terms of small RNA length distribution, miRNA families and expression levels, indicating that the morphological and life history variation observed 1) between the two types of Poa annua, and 2) among allotetraploid Poa annua and the two diploid parental species are not attributable to the small RNAs examined. However, the profiles generated from this study could serve as a baseline for future work. In summary, the discoveries from this thesis work enhanced our understanding of the phenotypic variability and incredible adaptability of Poa annua, and provided insights into plant polyploid evolution.

Download or read book Effect of Spray Droplet Size on Pronamide Control of Annual Bluegrass Poa Annua L and the Role of Absorption and Translocation in the Mechanism of Pronamide Resistance written by Martin Ignes and published by . This book was released on 2022 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Annual Bluegrass Poa Annua L Emergence Under Different Residue Management Practices in Perennial Ryegrass and Determination of Resistant and Susceptible Annual Bluegrass Germination Under Controlled Temperature and Moisture written by Matthew D. Schuster and published by . This book was released on 1999 with total page 186 pages. Available in PDF, EPUB and Kindle. Book excerpt: With the loss of field burning the amount of crop residue that remains in perennial ryegrass fields has increased. As the amount of crop residue remaining in the field increases so does annual bluegrass. This has resulted in the increased use of herbicides to control annual bluegrass. However, this increased use has also resulted in herbicide-resistant annual bluegrass. Field experiments were initiated in 1997 to investigate residue management options available to growers and their impacts on annual bluegrass emergence. Two sites, Glaser and Wirth, were established with three residue management treatments replicated four times. The treatments included full-straw, bale/flail, and vacuum sweep. Perennial ryegrass seed yield and annual bluegrass seed contamination were evaluated. The vacuum sweep treatment had lower annual bluegrass emergence than the full-straw or the bale/flail treatments during the 1997-98 growing season, for both sites. The fall of 1998 was much drier than the fall of 1997. Annual bluegrass emergence in all plots was lower in 1998 than in 1997 because of the dry conditions. Fall emergence in 1998 was higher in the vacuum sweep treatment than in the other two treatments, which may have been the result of better soil-seed contact in the vacuum sweep treatment. Lower emergence in the spring at the Wirth site compared to the Glaser site may have been due to narrow crop row spacing and cultivar selection, which shaded the annual bluegrass. When growing seasons were combined, there were no treatment differences. However, more emergence was observed in the spring at the Glaser site compared to the Wirth site. Yield was highest for the vacuum sweep treatment at the Glaser site in the 1998-99 growing season. However, competition from volunteer perennial ryegrass in the full-straw and bale/flail treatments could have accounted for this increase. No other differences in yield and no difference in contamination among treatments were observed. However, contamination at the Glaser site was higher in the 1998-99 growing season than in the 1997-98 growing season. Experiments were conducted in growth chambers to determine how differing environmental conditions affect seed germination of diuron-susceptible and diuron-resistant annual bluegrass. Cumulative germination for the susceptible-biotype decreased from 96% to 88% while the resistant-biotype remained above 95% as temperature decreased from 3 0/20 C to 10/2 C. The susceptible-biotype germinated sooner than the resistant-biotype regardless of temperature. The susceptible-biotype had a higher rate of germination than the resistant-biotype at 30/20 C, but not when the temperature decreased to 10/2 C. Germination response to differing matric potentials did not vary much within a biotype for a given soil type and temperature. Therefore, parameters estimated at -1.03 MPa were chosen to contrast susceptible- and resistant biotypes, and soil types, for each temperature. Maximum cumulative germination was greater than 96% for all treatments. When germination on a given soil type was contrasted, differences were only seen for the susceptible biotype vs. resistant biotype on Dayton soil; and the resistant biotype on Dayton soil vs. resistant biotype on Woodburn soil at both temperatures. The lag in onset of germination was shorter for the susceptible biotype on Dayton soil and resistant biotype on Woodburn soil than the resistant biotype on Dayton soil at 30/20 C. At 18/5 C, the lag in onset of germination was shorter for the susceptible biotype on Dayton soil and resistant biotype on Woodburn soil than the resistant biotype on Dayton soil (P = 0.000 1 and 0.0001, respectively). But the rate of germination was faster for the resistant biotype on Dayton soil than both the susceptible biotype on Dayton soil and resistant biotype on Woodburn soil at 18/5 C (P = 0.02 and 0.0004, respectively). The rate of germination did not differ at 3 0/20 C. When just the soils were contrasted, at 18/5 C all annual bluegrass seeds on the Woodburn soil germinated sooner and the rate of germination was higher than on the Dayton soil. These results indicate that the hydraulic properties of the soils may influence germination. However, this was not observed at 30/20 C. The results suggest that the susceptible-biotype was more sensitive to temperature while the resistant-biotype was more sensitive to moisture. Changing crop management in ways that will reduce annual bluegrass emergence and establishment is needed. By altering management strategies, growers may obtain more efficient and effective use of herbicides, while reducing the selection of herbicide-resistant annual bluegrass.