NDLI: Walnut Blight Management Using Xanthomonas Arboricola Pv. Juglandis Dormant Bud Population Sampling

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Walnut Blight Management Using Xanthomonas Arboricola Pv. Juglandis Dormant Bud Population Sampling

Content Provider	Semantic Scholar
Author	Buchner, Richard P. Gilles, Cyndi Olson, William H. Adaskaveg, James E. Lindow, Steven E. Koutsoukis, R.
Copyright Year	2014
Abstract	Walnut blight orchard surveys have been underway for four years in Tehama County and three years in Butte County. In total, thirty walnut orchards are being monitored using dormant bud population assays for Xanthomonas arboricola pv juglandis (Xaj), individual orchard spray programs and the subsequent amount of walnut blight visually evaluated in early June. For the Tehama County orchards, bud populations are relatively low and effective spray programs are managing walnut blight damage. For Butte County orchards, walnut blight damage was high in 2012, however, lower blight disease pressure and effective spray programs in 2013 dramatically reduced walnut blight damage. Comparisons of the percent dormant buds infested with pathogen to the Xaj populations within buds revealed a very good relationship suggesting the percent infested buds can be used to indicate disease potential. For 2012 and 2013 the percent buds with pathogen did a good job of predicting disease risk. Typically, walnut orchards with walnut blight damage in the previous year are at risk of damage in the current year. Dormant bud population information appears to be a better predictor of disease risk. Relationships are surprisingly good particularly when spray programs and weather are uncontrolled variables. Walnut blight transects for the number of blighted walnuts per tree is beginning to show how much tree to tree variation exists within orchards. This information is valuable for determining how many trees are necessary for a representative sample.
Starting Page	331
Ending Page	338
Page Count	8
File Format	PDF HTM / HTML
DOI	10.17660/ActaHortic.2014.1050.45
Alternate Webpage(s)	http://walnutresearch.ucdavis.edu/2013/2013_307.pdf
Alternate Webpage(s)	https://doi.org/10.17660/ActaHortic.2014.1050.45
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article

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