June 23, 2017

Brian Nault – NY State Commentary – Onion ipmPIPE

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2012 -NY Report – August 8

 

Onion ipmPIPE website regional report

 

New York State Report  – August 8, 2012

 

Onion Crop Growth Stage and Status:

Onions continue to mature earlier than normal, presumably a consequence of the drought and high temperatures during June and July.  Early-maturing varieties continue to be harvested.  Bulb size has been smaller than normal, but quality has been excellent.

 

Weather impacts (temperature, rain, hail, freezing):

Still drier than usual, but some locations have received some rain within the past week or so.  Temperatures have been normal.

 

Insect Scouting, Outlook and Management: 

Maggots:  None observed from third generation.

Thrips:  Thrips pressure continues to be high in spots, especially in fields near those that have matured and are harvested.  Most growers have sprayed 5 to 6 times, mostly with Movento, AgriMek, Lannate and some with Radiant.  Movento and Radiant have worked very well.  AgriMek and Lannate have done well when pressure is low to moderate, but not done as well under high pressure.

 

Disease Scouting, Outlook and Management: 

Iris yellow spot virus:  Yes, within the past week to 10 days.  Fields are beginning to show mild symptoms of IYSV, especially along edges.

Soil-borne Diseases (Damping-off, pink root, Fusarium basal rot):  none reported

Fungal Diseases (purple blotch, downy mildew, Botrytis leaf blight):  Botrytis leaf blight (BLB) is not common;  purple blotch incidence is low and downy mildew not present.  Growers are using Bravo and Scala for disease control.

Bacterial Diseases (Xanthomonas, center rot, soft rots):  Present at very low levels in some fields.

 

 

New York State report filed by:

Brian A. Nault, Dept. of Entomology, Cornell University

Email:  ban6@cornell.edu

Phone:  315-787-2354

 

Comments by others in New York State included in this report:

Christy Hoepting, Cornell Cooperative Extension, Albion, NY

Email:  cah59@cornell.edu

 

Lindsey du Toit -Washington State Commentary – Onion ipmPIPE

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2012 WA Commentary 7-27-2012

 

WASHINGTON and OREGON Columbia Basin Onion Commentary

 

Onion Crop Growth Stage and Status Last Modified: 07/27/12

Crops are at stages 6-7 in Sentinel Plots in the south and north Columbia Basin. The crops look good overall. Some onion seed crops have been swathed and are drying, while others are still in pollination and seed set.

 

Weather Impacts (temperature, rain, hail, freezing) Last Modified: 07/27/12

July has been hot and surprisingly humid for the Columbia Basin, with frequent thunderstorms. Scattered hailstorms in mid-July resulted in damage to >1,000 acres of onion bulb crops and some onion seed crops. Growers are concerned about secondary infection from bacteria and fungi in hail-damaged crops.

Central Washington temperature outlook (2-4 weeks): 30% above average*

Central Washington precipitation outlook (2-4 weeks): 40% below normal*

* Courtesy of Planalytics, Inc. (http://apps.planalytics.com)

 

Insect Scouting, Outlook and Management Last Modified: 07/27/12

Thrips

Thrips numbers averaged 12-13/plant in the south Columbia Basin Sentinel Plots, and 24-48/plant in Sentinel Plots in the north Basin.

Maggots

No maggot damage this time of year.

 

Other

4% of plants in one of the south Columbia Basin Sentinel Plots had leafminer injury, and 2% of the plants in that Sentinel Plot had green peach aphids.

 

Disease Scouting, Outlook and Management Last Modified: 07/27/12

Iris yellow spot virus

No symptoms in Sentinel Plots.

Soil-borne Diseases (damping-off, pink root, Fusarium, Rhizoctonia)

Pink root observed on 2% of plants in one of the south Basin Sentinel Plots.

 

Fungal Diseases (purple blotch, downy mildew, Botrytis)

Downy mildew observed in several bulb crops in the south Columbia Basin. A drip-irrigated onion bulb crop in the south Basin had symptoms of Botrytis infection in the bulbs, apparently associated with excessive irrigation.

 

Bacterial Diseases (Xanthomonas, center rot, soft rots)

Soft rot was not observed in any Sentinel Plots, but secondary bacterial infection was observed on lower scapes in several onion seed crops with hail damage in the north Columbia Basin, with girdling lesions caused by secondary bacterial infections observed on the lower end of scapes (<5%). Similarly, with >1,000 acres of bulb crops damaged by hail in mid-July, some growers are concerned about secondary bacterial infection in bulb crops.

 


Onion Specialist (submitted on behalf of WA/north-central OR onion participants)

Lindsey du Toit
Associate Professor of Plant Pathology, Washington State University,

Email: dutoit@wsu.edu, 360-848-6140

 

Lindsey du Toit – Washington State Commentary – Onion ipmPIPE

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2012 WA Commentary 6-29-2012

WASHINGTON and OREGON Columbia Basin Onion Commentary

Onion Crop Growth Stage and Status Last Modified: 06/29/12
Overwintered onion crops in the south Columbia Basin are being harvested and appear to have
good yields to date. Spring planted onion bulb crops look good overall. Crop growth is at stages
4-5 in the north Columbia Basin, and 4 to 6 in the south Columbia Basin in the Sentinel Plots.

Weather Impacts (temperature, rain, hail, freezing) Last Modified: 06/29/12
Although conditions have been typical in the Columbia Basin for most of June, heavy rains
occurred on 26 June (~1”). In addition, two large, adjacent onion fields south of Warden, WA
suffered significant hail damage from a storm on 24 June (400 acres impacted). Precipitation is
above normal for June.

Central Washington temperature outlook (2-4 weeks): 30% below normal to average*
Central Washington precipitation outlook (2-4 weeks): 30% below average to average*
* Courtesy of Planalytics, Inc. (http://apps.planalytics.com)

Insect Scouting, Outlook and Management Last Modified: 06/29/12
Thrips
Thrips numbers and damage are increasing weekly in the Columbia Basin (severity ratings of 1-2
in the Sentinel Plots).

Maggots
No maggot damage to report this time of year.

Other
Pea leaf miner observed on 4% of the plants in one Sentinel Plot in the south Columbia Basin
(mild symptoms).

Disease Scouting, Outlook and Management Last Modified: 06/29/12
Iris yellow spot virus
Some IYSV present in overwintered onion crops in the south Basin, but nothing significant. No
symptoms in the Sentinel Plots.

Soil-borne Diseases (damping-off, pink root, Fusarium, Rhizoctonia)
Patches continue to show from Rhizoctonia infection in bulb crops on very sandy fields in
the south Basin, planted in rotation with overwintering cereal cover crops that are killed with
herbicides at the time of planting onion seed. No patching evident in the Sentinel Plots.

Fungal Diseases (purple blotch, downy mildew, Botrytis)
A severe case of pink root in the non-fumigated half of a center-pivot irrigated crop in the north
Columbia Basin, compared to mild symptoms in the half of the field that was fumigated prior to
planting. Pink root observed on 2% of plants in a Sentinel Plot in the south Columbia Basin.

Bacterial Diseases (Xanthomonas, center rot, soft rots)
One sample from the south Columbia Basin (Oregon side) that had tip dieback, yellowing, and a

watery appearance on the upper 25% of the leaf was identified by the National Onion Bacterial
Lab as Pantoea agglomerans. Pathogenicity tests were completed by inoculating onion bulbs.
Leaf pathogenicity tests will be completed in July to see if symptoms similar to those observed
on the field sample can be reproduced.

Onion Specialist (submitted on behalf of WA/north-central OR onion participants)
Lindsey du Toit
Associate Professor of Plant Pathology, Washington State University,
Email: dutoit@wsu.edu, 360-848-6140

Onion ipmPIPE Project

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The ONION ipmPIPE was developed in response to stakeholder demands for a coordinated and comprehensive website where onion farmers and agricultural professionals could obtain: 1) real-time information on the distribution and severity of priority diseases and insect pests in North America; 2) time-sensitive disease risk assessments; 3) information on disease and insect pest management options and 4) links to other important tools on onion production and pest management.   Stakeholders are advised of the status of priority diseases and insect pests through observational maps and national/state commentaries on a public website.  This allows all state commentaries/observations within reach in one website.

Emphasis is on  Onion (green, transplanted, seeded, storage, processed); and other alliums such as garlic & chives benefit from research on pests and diseases.  Priority Diseases and Insect Pests include: Iris yellow spot virus (IYSV); Thrips (emphasis on onion thrips) – as a vector of IYSV and a pest;  Other insects such as onion maggot;  Foliar & storage fungal diseases including Botrytis, Purple Blotch, Downy Mildew, Blue Mold, Black Mold; and Foliar & Storage bacterial diseases including Xanthomonas Leaf Blight, Sour Skin, Slippery Skin, Pantoea, Soft Rots.

A national team of onion experts, growers and industry representatives have created a unique on-line resource that will enhance the production, pest management, storage, and marketing of this vital food product for the consuming public in the United States and internationally.  This multi-year project is funded in part by the USDA’s Specialty Crop Research Initiative established by the 2008 Farm Bill; and has been endorsed by state and national onion organizations throughout all major onion-producing regions of the country.

Lindsey du Toit – Washington

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WASHINGTON and OREGON Columbia Basin Onion Commentary
Onion Crop Growth Stage and Status Last Modified: 05/17/12
Onion plantings complete in the Columbia Basin of Oregon and Washington States; estimated
20,000 acres planted. Spring-planted onion crops in the south Basin range from cotyledon to 3
true-leaf growth stage. Crops in the north Basin typically are further behind depending on
planting date. Onion seed crops fared well through the relatively mild winter and have bolted
(most at the stage of emerged but unopened umbels).
Weather Impacts (temperature, rain, hail, freezing) Last Modified: 05/17/12
April was the warmest in the past 5 months for the Columbia Basin of central WA/north-central
OR, although a fair amount of rain was received.
Insect Scouting, Outlook and Management Last Modified: 05/17/12
Thrips
No monitoring yet. Tim Waters observed low numbers of thrips on some volunteer onions, and
anticipates populations may increase early this season because of warmer spring conditions.

Maggots
No surveys or reports at this time. Tim Waters has observed higher numbers of adult maggot
flies than usual in the south Columbia Basin, but it appears that onion growers’ standard maggot
management practices are effectively mitigating significant impact of the flies.

Other
No surveys or reports at this time.
Disease Scouting, Outlook and Management Last Modified: 05/17/12

Iris yellow spot virus
No surveys or reports at this time
Soil-borne Diseases (damping-off, pink root, Fusarium, Rhizoctonia)
First evidence of patching developing in association with Rhizoctonia infection in bulb crops on
very sandy fields in the south Basin (northcentral OR and southcentral WA), particularly the
earlier planted fields.

Fungal Diseases (purple blotch, downy mildew, Botrytis)
No surveys or reports at this time.
Bacterial Diseases (Xanthomonas, center rot, soft rots)
No surveys or reports at this time.

Onion Specialist (submitted on behalf of WA/north-central OR onion participants)
Lindsey du Toit
Associate Professor of Plant Pathology, Washington State University,
Email: dutoit@wsu.edu, 360-848-6140

Mary Hausbeck – Michigan

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July 28, 2011 Warm, dry conditions have been prevalent the last couple weeks. These conditions don’t appear to be helping to increase thrips populations, which are still patchy. A report of downy mildew on the western side of the state is also likely being confined because of these conditions. Cool, moist conditions caused by recent rains may promote the spread of downy mildew, which should be scouted for.