Date of Award
2016
Publisher
North Dakota State University
Document Type
Thesis
Degree Awarded
Master of Science (MS)
Program
Plant Pathology
Department
Plant Pathology
College
Agriculture, Food Systems and Natural Resources
Faculty Advisor
Mendoza, Luis del Rio
Description
Azoxystrobin and boscalid are fungicides frequently used to manage diseases caused by Sclerotinia sclerotiorum (Lib.) de Bary in many broadleaf crops in North Central US. . Continued use of these compounds can induce development of fungicide-resistant strains and thus their sensitivity should be monitored periodically. The objective of this research was to generate baseline sensitivity information of S. sclerotiorum to azoxystrobin and boscalid. Salicylhydroxamic acid was toxic to ascospores even at concentrations of 0.1 μg/ml and therefore was not used to estimate sensitivity to azoxystrobin. Azoxystrobin EC50 for ascospores and mycelium were 3.05 and 1.01 μg/ml, respectively. Boscalid EC50 for ascospores and mycelium were 8.38 and 0.11 μg/ml, respectively. S. sclerotiorum isolates collected before 2004 had statistically (P > 0.05) similar sensitivity to azoxystrobin but where more sensitive to boscalid (P =0.05) than isolates collected in 2014. Both fungicides continue to be effective tools to manage S. sclerotiorum.
Recommended Citation
Munoz, Claudia Lucia, "Sensitivity of Sclerotinia Sclerotiorum Isolates From North Central US to Azoxystrobin and Boscalid" (2016). Plant Pathology. 8.
https://digitalcommons.ndsu.edu/plant-path/8
Rights
NDSU policy 190.6.2
Rights Link
https://www.ndsu.edu/fileadmin/policy/190.pdf
Handle Identifier
https://hdl.handle.net/10365/28037