Newsletter Archives |
August 2002 Newsletter
Lindsey du Toit and Debra Inglis, editorsWSU Mount Vernon NWREC
16650 State Rte 536, Mount Vernon, WA 98273-4768
360-848-6140 (tel), 360-848-6159 (fax)
WSU Vegetable Pathology Team Newsletter
HELLO!
Welcome to the Aug 2002 edition of Washington State University's Vegetable Pathology Extension Team newsletter, the last edition of the 2002 growing season. This issue focuses on CARROTS, and we hope you enjoy it! Carrots are the most important source of beta carotene in the U.S. diet. In addition to beta carotene, the precursor of vitamin A, new "nutritionally improved carrots" now being tested by WSU contain one or more of several other plant pigments, such as xanthophyll, lycopene and anthocyanin that act as antioxidants and may help prevent heart disease and some forms of cancer. Pigment power in carrots may open a new a niche market for carrot growers, packers, and processors, and provide consumers with more colorful and health-promoting carrots.
Did you know that Washington's processing carrot growers are among the top producers in the nation? They grew 203,000 tons for the 1999 crop, which represents 35% of the U.S. total. Fresh market growers harvested 2,600 acres for the 1999 crop. Together, the value of production for fresh market and processing carrots was $31 million in Washington during 1999. For more information about carrots in Washington, look at the WSU Vegetable Pathology Team website at:
https://mtvernon.wsu.edu/path_team/carrot.htm.
If you have questions or comments about carrot or other vegetable diseases or WSU's Vegetable Pathology Team, contact Debbie Inglis (dainglis@wsu.edu) or Lindsey du Toit (dutoit@wsu.edu).
PEST ALERT!!!
Cavity spot on carrot caused by Pythium spp. (photo courtesy of Lindsey duToit).
Growers have reported problems with root diseases caused by Pythium and Rhizoctonia in some early-harvested carrot fields in the Columbia Basin. Generally, these problems follow periods with extremely high temperatures. Virus diseases are also showing up in some fields which border sagebrush land. Find out more about carrot diseases and their control in the table at the end of this newsletter.
PLACES TO FIND INFORMATION ABOUT CARROTS
2002 WSU Carrot Field Day Scheduled
You are invited to attend the 2002 WSU Carrot Cultivar Field Day! This year's event will feature 60+ lines of "nutritionally improved carrots" from the USDA carrot breeding program in Wisconsin, along with several commercially-available specialty carrots. The entries, which include dark-orange, yellow, red, and purple carrots, were planted for evaluation under local conditions on April 18. The field day will be an opportunity to observe these colorful new carrots, and discuss the carrot breeding program with Dr. Phil Simon, USDA carrot breeder, as well as meet with members of the Washington carrot industry.
The field day, which begins at 9:00 a.m., will be held at Klaustermeyer Farms on Aug 29. The field with the trial is located on Buffalo Lane, north of Hollingsworth Road and west of Buffalo Road. Everyone with an interest in carrot production and marketing is welcome to attend. Refreshments will be provided. For more information contact Erik Sorensen: tel- 509-545-3511, fax - 509-545-2130, or email – esorensen@wsu.edu. The carrot field day is sponsored by Washington State University Cooperative Extension, Benton-Franklin Counties, and the Pacific Northwest Vegetable Association.
Interested in Growing Carrots?
Information about growing carrots in Washington can be found within the Crop
Profile for Carrots in Washington on the web at:
https://www.tricity.wsu.edu/~cdaniels/profiles/Carrot2.pdf
Additional information about growing carrots can be found in the Commercial
Vegetable Production Guides from Oregon State University on the web at:
https://www.orst.edu/Dept/NWREC/root.html
Washington State University publications about carrots can be found at:
https://pubs.wsu.edu/scripts/PubOrders/webListing.asp?category=270
Washington State University EB 1504, "Costs of Production: 2000 Carrot Enterprise
Budgets, Columbia Basin", is now available on-line at:
https://farm.mngt.wsu.edu/irr.html.
Carrot Country
For regular information about issues concerning the U.S. carrot
industry, you can subscribe to Carrot Country by contacting Columbia
Publishing @ 509-248-2452 or by fax @ 509-248-4056. This magazine is a quarterly
publication. The subscription fee is $8.
Carrot Research Projects in Washington...
Research projects on carrot diseases, pests, and other production
issues are being carried out in the Columbia Basin by WSU faculty and extension
agents:
1) Gary Pelter, WSU Extension Agent, has trials on weed control in carrot seed crops in the Columbia Basin.
2) Lindsey du Toit, WSU Vegetable Seed Pathologist, has a project on bacterial leaf blight (Xanthomonas campestris pv. carotae) on carrot seed crops, in collaboration with Fred Crowe, plant pathologist at OSU.
For further information about these projects, contact: Gary Pelter at 509-754-2011 ext. 314 or pelterq@wsu.edu; or Lindsey duToit at 360-848-6140 or dutoit@wsu.edu.
Mark Your Calender Now
This year's Pacific Northwest Vegetable Association Conference
will be held Nov. 21-22 in Pasco. The reporting session on carrots will be arranged
for Nov. 22. For more information, contact Erik Sorensen (esorensen@wsu.edu).
INFORMATION ABOUT CARROT DISEASES & PESTS
Carrot Disease Compendium Available
APS Press now offers the "Compendium of Diseases of Umbelliferous
Crops" edited by R. M. Davis and R. N. Raid. The manual includes information
about diseases of carrot, celery, cilantro, coriander, parsnip and other umbelliferous
plants. To order call 1-800-328-7560 or view https://shopapspress.org The cost is $49.
2001 Field Research Reports on Carrot Diseases
The 2002 volume of Fungicide and Nematicide Tests (results
of 2001 published in 2002) includes four reports of field research done on carrots
at various locations in the U.S. For access, see https://www.apsnet.org/online/FNtests/vol57/top.htm
1) Carroll, J. E., Ludwig, J. W., and Abawi, G. S. Evaluation of fungicides for control of leaf blight on carrot, 2002. Report No. 57:V018.
2) Langston, D. B. and J. E. Hudgins. Evaluations of fungicides and protection intervals for control of Alternaria leaf spot of carrot using two nitrogen fertility regimes, 2001. Report No. 57:V019.
3) Miller, M. E. and Hernandez, A. Evaluation of fungicides for powdery mildew control on carrot, 2001. Report No. 57: VO20.
4) Rogers, P. M., James, R. V., Stevenson, W. R., and Rand, R. E. Evaluation of fungicides to control carrot foliar blights, 2001. Report No. 57: V021.
In addition, the 2002 volume of Biological and Cultural Tests for Control of Plant Diseases (results of 2001 published in 2002) includes two reports of field research done on carrots. For access, see https://www.apsnet.org/online/BCtests/Vol17/top.htm
1) Rogers, P. M., James, R. V., Stevenson, W. R., and Rand, R. E. Evaluation of carrot cultivars and breeding selections to identify resistance to foliar blights - Lewiston, 2001. Report No. 17:V09.
2) Rogers, P. M., James, R. V., Stevenson, W. R., and Rand, R. E. Evaluation of carrot cultivars and breeding selections to identify resistance to foliar blights - Hancock, 2001. Report No. 17:V08.
Photos of Carrot Diseases On-Line
WSU's Vegetable Pathology Team maintains a
vegetable disease photo gallery which includes photos of diseases on carrots.
Visit the site at: https://mtvernon.wsu.edu/path_team/diseasegallery.htm#carrot
Some Important Diseases on Carrot in Washington
Name | Pathogen | Important Features |
---|---|---|
Alternaria leaf spot and leaf blight | Alternaria dauci | Hosts: one of the most
common foliar diseases of carrot; can also affect parsley. |
Aster yellows and BLTVA | Aster yellows phytoplasma and beet leafhopper-transmitted virescence agent | Hosts: more than 300 species
of plants affected. Aster yellows occurs worldwide but BLTVA has been reported
in carrot only in the western U.S. |
Bacterial leaf blight | Xanthomonas hortorum pv. carotae | Hosts: primarily carrot. |
Bacterial soft rot | Erwinia carotovora subsp. carotovora, and Erwinia chrysanthemi | Hosts: common on many
umbelliferous crops especially in storage; usually associated with wounds,
freezing injury, insect openings, contaminated wash water or improper storage
conditions. |
Cavity spot, forking and stubbing | Pythium spp. | Hosts: carrots primarily,
although many asymptomatic hosts of some Pythium species are suspected. |
Cottony rot or white mold | Sclerotinia sclerotiorum | Hosts: one of the most
common diseases of carrot crowns and roots, occurring also on many other
crops such as beans, cabbage and cucurbits. |
Motley dwarf | Carrot mottle virus and carrot red leaf virus | Hosts: on carrot but also
cilantro, dill and parsley. |
Powdery mildew | Erysiphe heraclei | Hosts: Many umbelliferous
crops such as carrot, anise, caraway, chervil, coriander, dill, fennel,
parsley and parsnip. |
Root knot nematode | Meloidogyne hapla | Hosts: root knot nematodes
are distributed worldwide and occur on many crops species. |
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