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Peetz, Amy B.; Mahaffee, Walter F.; Gent, David H. (2009). "Effect of Temperature on Sporulation and Infectivity of Podosphaera macularis on Humulus lupulus". Plant Disease. 93 (3): 281–286. doi:10.1094/PDIS-93-3-0281. PMID30764182. S2CID53689117.
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Peetz, Amy B.; Mahaffee, Walter F.; Gent, David H. (2009). "Effect of Temperature on Sporulation and Infectivity of Podosphaera macularis on Humulus lupulus". Plant Disease. 93 (3): 281–286. doi:10.1094/PDIS-93-3-0281. PMID30764182. S2CID53689117.
Marks, Michelle; Gevens, Amanda (December 2014). "Hop Powdery Mildew"(PDF). University of Wisconsin-Extension. University of Wisconsin. Archived from the original(PDF) on December 8, 2015. Retrieved October 19, 2015.
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plantpath.wisc.edu
Marks, Michelle; Gevens, Amanda (December 2014). "Hop Powdery Mildew"(PDF). University of Wisconsin-Extension. University of Wisconsin. Archived from the original(PDF) on December 8, 2015. Retrieved October 19, 2015.