The management of Sclerotinia stem rot of soybean caused by [Sclerotinia sclerotiorum (Lib) de Bary] integrates several tactics that may include biological control. However, the successful incorporation of biocontrol agents into the management program might be hindered by agrochemical application. To determine the compatibility of potential biocontrol agents with agrochemicals, growth of Trichoderma asperellum, T. gamsii and Coniothyrium minitans was tested with selected chemicals on agar plates. Effects of selected agrochemicals on C. minitans growth and biocontrol activity were also tested in soil and in water. On amended agar media, Trichoderma spp. and C. minitans were insensitive to the herbicide lactofen and were inhibited to varying degrees by some of the tested fungicides. The survival and the biocontrol activity of C. minitans in the soil was not impaired by propamocarb HCl, tetraconazole or lactofen treatments. When mixed in a water suspension, none of the selected the herbicides or a biofertilizer affected C. minitans population in the suspension over a 4 h period, suggesting that they can be applied in a tank mix. Under field conditions, Trichoderma spp. and C. minitans reduced the disease severity and viable sclerotial population of S. sclerotiorum, but their efficacy varied across years and location. Co-application with lactofen enhanced the efficacy of disease suppression and yield in some cases but reduced the efficacy in others. The effect of the biological control agents or chemicals evaluated on yield during three years of trials was inconsistent.
|Advisor:||Mathison, Margaret M.|
|Commitee:||Bowman, Anthony J., Trevino, John, Turney, Robert D.|
|School Location:||United States -- Wisconsin|
|Source:||MAI 52/06M(E), Masters Abstracts International|
|Keywords:||Centrifugal, Compressor, Hot gas bypass, Modeling, Test block, Testing|
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