Combining Biorational Compounds to Optimize Control of Grape Powdery Mildew (Uncinula Necator)

Fiedler, Kathryn

Publication:
Combining Biorational Compounds to Optimize Control of Grape Powdery Mildew (Uncinula Necator)

dc.contributor.advisor	Daniel R. Cooley
dc.contributor.author	Fiedler, Kathryn
dc.contributor.department	University of Massachusetts Amherst
dc.contributor.department	Plant & Soil Sciences
dc.date	2023-09-22T20:10:11.000
dc.date.accessioned	2024-04-26T21:08:26Z
dc.date.available	2010-03-10T00:00:00Z
dc.date.issued	2009-01-01
dc.date.submitted	2009-September
dc.description.abstract	In the Northeast, powdery mildew (PM), caused by Uncinula necator (Schewein.) Burrill is one of the most important grape diseases in terms of economic loss. It has been established that cultural practices, including proper sanitation, are the first step in preventing disease, and fungicide sprays are regularly applied to manage the disease. Currently, fungicides that successfully control PM have a strong potential to develop pathogen resistance, and alternatives with low risk of initiating resistance are not as effective in disease control. Our approach to this emerging resistance dilemma is to combine a systemic acquired resistance inducer (salicylic acid and potassium phosphate) with a topical fungicide, potassium bicarbonate. To determine each treatment’s level of efficacy, multiple aspects of infection and defense were quantified and qualified, including germination rate, lethality, lignin formation, callose formation, and vine and leaf growth. The first trial showed potassium bicarbonate and the standard fungicide (Pristine) inhibited the most germination and was most lethal against PM conidia. Potassium phosphate had little effect on germination and conidia death, and when combined with bicarbonate there was no different than the water control. In the second trial, the biorational mixture was able to reduce the level of powdery mildew infection significantly more than the other compounds, including the commercial standard. The salicylic acid and potassium bicarbonate mix may be successful enough to use in the vineyard to determine if the compound can tolerate field conditions with the same level of efficacy.
dc.description.degree	Master of Science (M.S.)
dc.identifier.doi	https://doi.org/10.7275/1002022
dc.identifier.uri	https://hdl.handle.net/20.500.14394/47244
dc.relation.url	https://scholarworks.umass.edu/cgi/viewcontent.cgi?article=1453&context=theses&unstamped=1
dc.source.status	published
dc.subject	Plant pathology
dc.subject	Plant Pathology
dc.subject	Agricultural chemicals
dc.title	Combining Biorational Compounds to Optimize Control of Grape Powdery Mildew (Uncinula Necator)
dc.type	campus
dc.type	article
dc.type	thesis
digcom.contributor.author	isAuthorOfPublication\|email:k.d.fiedler@gmail.com\|institution:University of Massachusetts Amherst\|Fiedler, Kathryn
digcom.date.embargo	2010-03-10T00:00:00-08:00
digcom.identifier	theses/367
digcom.identifier.contextkey	1002022
digcom.identifier.submissionpath	theses/367
dspace.entity.type	Publication