Fungicides are most often mixed with water and applied as a dilute spray for controlling diseases on golf course turf. Although published reports show that water quality can influence the performance of certain herbicides, evidence of similar effects on fungicide efficacy is weak and largely anecdotal. The objective of this research was to investigate the influence of water pH on efficacy of fungicides commonly used against dollar spot, a problematic disease on creeping bentgrass. In this study, three fungicides (metconazole, thiophanate-methyl, and iprodione) were mixed with water stabilized at three pH levels (pH= 5.0, 7.0, and 9.0) in in vitro and field experiments. Also considered was a time factor, i.e., the time between mixing and application where time T0 indicated fungicides were applied immediately after mixing, and time T24 indicated that fungicides were applied 24 hours after mixing. Results from field experiments revealed little or no difference in fungicide performance when mixed in acidic (pH=5.0), neutral (pH=7.0), and alkaline (pH=9.0) water. Also, the time factor was not significant for all fungicides and water pH levels. Results from in vitro work supported field observations—few differences in pathogen growth were observed for pH and time factors. Although tank mixing products to neutralize water pH may be important for other reasons, results reported here support the null hypothesis that the carrier water pH does not influence fungicide efficacy for control of dollar spot on creeping bentgrass.
|Commitee:||Patton, Aaron, Wise, Kiersten|
|Department:||Botany and Plant Pathology|
|School Location:||United States -- Indiana|
|Source:||MAI 57/06M(E), Masters Abstracts International|
Copyright in each Dissertation and Thesis is retained by the author. All Rights Reserved
The supplemental file or files you are about to download were provided to ProQuest by the author as part of a
dissertation or thesis. The supplemental files are provided "AS IS" without warranty. ProQuest is not responsible for the
content, format or impact on the supplemental file(s) on our system. in some cases, the file type may be unknown or
may be a .exe file. We recommend caution as you open such files.
Copyright of the original materials contained in the supplemental file is retained by the author and your access to the
supplemental files is subject to the ProQuest Terms and Conditions of use.
Depending on the size of the file(s) you are downloading, the system may take some time to download them. Please be