Crown gall can spread between walnut trees in nurseries and reduce future yields
While walnut trees on Juglans hindsiix J. regia ‘Paradox’ rootstocks are highly susceptible to crown gall, it is unknown whether this bacterial disease is acquired in the nursery or the orchard. We selected two groups of gall-free trees in nurseries, those adjacent to tree...
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2008-05-01
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doaj-cad4cfd09a4d40afaf21ab8d1b39963c2020-11-25T01:40:46ZengUniversity of California Agriculture and Natural ResourcesCalifornia Agriculture0008-08452160-80912008-05-0162311111510.3733/ca.v062n03p11110.3733/cav062n03_9Crown gall can spread between walnut trees in nurseries and reduce future yieldsLynn Epstein0Sukhwinder Kaur1James R. McKenna2Joseph Grant3William Olson4Wilbur O. Reil5L. Epstein is Professor, Department of Plant Pathology, UC DavisS. Kaur is Staff Research Associate, Department of Plant Pathology, UC DavisJ.R. McKenna was Staff Research Associate, Department of Pomology, UC Davis, and is currently with the USDA Forest Service at Purdue UniversityJ.A. Grant is Farm Advisor, UC Cooperative Extension (UCCE), San Joaquin CountyW.H. Olson is Farm Advisor Emeritus, UCCE Butte CountyW.O. Reil is Farm Advisor Emeritus, UCCE Yolo County. We thank Susan Bassein for statistical adviceWhile walnut trees on Juglans hindsiix J. regia ‘Paradox’ rootstocks are highly susceptible to crown gall, it is unknown whether this bacterial disease is acquired in the nursery or the orchard. We selected two groups of gall-free trees in nurseries, those adjacent to trees with and without galls. Two years after being transplanted in the orchard, trees in the group adjacent to those with galls had significantly greater — more than four times more — crown gall incidence than those adjacent to trees without galls (14% versus 3%). In addition, trees in prolonged (17-day), bare-root, unrefrigerated storage before transplanting were associated with higher crown-gall incidence. We also found that crown gall can decrease walnut tree productivity. For every quarter of trunk circumference that was galled, there was a 12% decrease in cumulative nut yield over the first 4 years of production.http://calag.ucanr.edu/archive/?article=ca.v062n03p111 |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Lynn Epstein Sukhwinder Kaur James R. McKenna Joseph Grant William Olson Wilbur O. Reil |
spellingShingle |
Lynn Epstein Sukhwinder Kaur James R. McKenna Joseph Grant William Olson Wilbur O. Reil Crown gall can spread between walnut trees in nurseries and reduce future yields California Agriculture |
author_facet |
Lynn Epstein Sukhwinder Kaur James R. McKenna Joseph Grant William Olson Wilbur O. Reil |
author_sort |
Lynn Epstein |
title |
Crown gall can spread between walnut trees in nurseries and reduce future yields |
title_short |
Crown gall can spread between walnut trees in nurseries and reduce future yields |
title_full |
Crown gall can spread between walnut trees in nurseries and reduce future yields |
title_fullStr |
Crown gall can spread between walnut trees in nurseries and reduce future yields |
title_full_unstemmed |
Crown gall can spread between walnut trees in nurseries and reduce future yields |
title_sort |
crown gall can spread between walnut trees in nurseries and reduce future yields |
publisher |
University of California Agriculture and Natural Resources |
series |
California Agriculture |
issn |
0008-0845 2160-8091 |
publishDate |
2008-05-01 |
description |
While walnut trees on Juglans hindsiix J. regia ‘Paradox’ rootstocks are highly susceptible
to crown gall, it is unknown whether this bacterial disease is acquired in the nursery
or the orchard. We selected two groups of gall-free trees in nurseries, those adjacent
to trees with and without galls. Two years after being transplanted in the orchard,
trees in the group adjacent to those with galls had significantly greater — more than
four times more — crown gall incidence than those adjacent to trees without galls
(14% versus 3%). In addition, trees in prolonged (17-day), bare-root, unrefrigerated
storage before transplanting were associated with higher crown-gall incidence. We
also found that crown gall can decrease walnut tree productivity. For every quarter
of trunk circumference that was galled, there was a 12% decrease in cumulative nut
yield over the first 4 years of production. |
url |
http://calag.ucanr.edu/archive/?article=ca.v062n03p111 |
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