June 23, 2017

Dan Drost – Utah State Commentary – Onion ipmPIPE

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Utah Commentary

 

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

Onion bulbing dominates growth in most fields with crop in growth stages 6 or 7.  Growers have

sufficient water to deal with irrigation needs and no water shortages noted.  Growers report few

problems but indicate that they are regularly applying insecticides for thrips control.

 

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

Tropical moisture flow out of SW USA dominated weather conditions in Utah over last two

weeks. Rain showers around in northern Utah occurred but very localized and less than ½ inch

reported.  Day temperatures were near normal with temperatures in low 90’s.

 

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

Thrips

Fourth round of field surveys completed this week.  Thrips populations in most fields are stable

or decreasing compared to earlier reports.

 

Maggots

None reported at this time

 

Other

None reported at this time

 

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

Iris yellow spot virus

IYSV incidences in Utah onion fields are very low with only one confirmed field with disease

and infection level very low.

 

Soil-borne Diseases (Damping Off, Pink Root, Fusarium)

Not observed or reported at this time

 

Fungal Diseases (purple blotch, downy mildew, Botrytis)

Some minor damage from purple blotch noted but incidence quite isolated at this time

 

Bacterial Diseases (Xanthomonas, center rot, soft rots)

Not observed or reported at this time

 

 

Onion Specialist

Daniel Drost

Professor of Horticulture

Utah State University

Email: dan.drost@usu.edu

 

Collaborators: Diane Alston, Claudia Nischwitz, Bonnie Bunn and Utah Onion Association

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.

Howard Schwartz – Colorado State Commentary Onion ipmPIPE

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CO Commentary (06-14-12)

 

COLORADO Commentary

Onion Crop Growth Stage and Status Last Modified: 06/14/12

Warm, dry conditions persist throughout Colorado, with few reports of any storm damage occurring in onion regions. Thrips pressure continues to build in Eastern, Southern and Western Regions of the state. Pink Root confirmed in southern Colorado (6 %); and beet armyworm was recovered from all 5 plant samples in western Colorado.

Weather Impacts (temperature, rain, hail, freezing) Last Modified: 06/14/12

The northern region has received very little rain in recent weeks, and other regions of the state received less than 0.25 inches or no rain. Temperatures have averaged in the mid 80 to low 90s during the day, and low to mid 50s in the evening.

Temperature Outlook* [2 – 4 weeks]: Above Normal

Precipitation Outlook* [2 – 4 weeks]: Below Normal

*Courtesy of Planalytics, Inc.

Insect Scouting, Outlook and Management Last Modified: 06/14/12

Thrips – Initial surveys in the northern region detected 3 to 28 (larvae + adult) in northern, 10 in southern and 6 thrips / plant in western regions on transplants or seeded.

Maggots – No surveys or reports at this time

Other – Beet armyworm recovered from 5 of 5 plant samples on the west slope.

Disease Scouting, Outlook and Management Last Modified: 06/14/12

Iris yellow spot virus – IYSV not detected in surveys of transplanted or seeded onions sampled in southern, northern and southern regions at this time.

Soil-borne Diseases (Damping Off, Pink Root, Fusarium) – Pink Root was confirmed in 6 % of seeded onions sampled in southern Colorado, but no reports from northern or southern regions at this time.

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

State Contact for Project Howard Schwartz Professor of Plant Pathology Colorado State University Email:howard.schwartz@colostate.edu

Collaborators: Whitney Cranshaw, Ned Tisserat, Stephanie Szostek, Janet Hardin,

Mike Bartolo, Thad Gourd, Bob Hammon, Colorado Onion Association

Howard Schwartz – Colorado

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CO Commentary (06-04-12)

COLORADO Commentary


Onion Crop Growth Stage and Status Last Modified: 06/04/12
Warm, dry conditions persist throughout Colorado, with few reports of any storm damage occurring in onion regions.
Weather Impacts (temperature, rain, hail, freezing) Last Modified: 06/04/12
The northern region has received very little rain in recent weeks, and other regions of the state received less than 0.25 inches or no rain. Temperatures have average in the mid 80 to low 90s during the day, and low to mid 50s in the evening.
Insect Scouting, Outlook and Management Last Modified: 06/04/12
Thrips
Initial surveys in the northern region detected 5 – 30 thrips (larvae + adult) on transplants. Seeded onion survey will begin soon, but low numbers of thrips per plant are anticipated.
Maggots
No surveys or reports at this time
Other
No surveys or reports at this time
Disease Scouting, Outlook and Management Last Modified: 06/04/12
Iris yellow spot virus
No reports at this time
Soil-borne Diseases (Damping Off, Pink Root, Fusarium)
No surveys or reports at this time
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 Howard Schwartz Professor of Plant Pathology Colorado State University Email:howard.schwartz@colostate.edu

Lindsey du Toit – Washington State Onion ipmPIPE commentary

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Lindsey du Toit – Washington

June 1, 2012. Onion planting is completed in the Columbia Basin of OR and WA. May was cooler than April, but crops are at average or slight advanced maturity for this time of year. Rhizoctonia patching evident in south Basin on sandy fields. Thrips populations starting to build. IYSV at a low incidence in the south Basin. Pink root evident in Walla Walla area.

Krishna Mohan – Idaho

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Sept 08, 2011 Harvesting of Onions in another 8 to 15 days.Crop growth is good with hot and dry conditions.Apart from confirmed IYSV, no other disease to report. Minor incidence of Cladosoprium from the dead and dying leaf tips. Thrips encountered in all the plots and their numbers are subsiding with the approaching harvest.

Krishna Mohan – Idaho

onion bulbs

August 25, 2011 Crop growth is good with hot and dry conditions.Apart from initial observations and confirmations of IYSV, no other disease to report. Thrips numbers and also the damage is increasing with prevailing hot weather.

Lindsey du Toit – Washington

onion_flowers

August 11, 2011 – Onion crops in the Columbia Basin of WA remain behind in maturity but conditions finally heated up in late July. No issues with IYS except in the Walla Walla area and a minor problems in a few seed crops in the north Basin. Thrips in all 5 Sentinel Plots, but populations are decreasing. A few fields of earlier maturing cultivars in the south Basin have been undercut, windrowed, and some harvested.

Mary Hausbeck – Michigan

onion-flowers

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.

Lindsey du Toit – Washington

onion_flowers

July 25, 2011 – Onion crops in the Columbia Basin of WA remain several weeks behind in maturity because of continued cool weather through early July. IYS symptoms seen in onion seed crops in the northern Basin, but far less than typical for this time of year. Thrips found in all 5 Sentinel Plots, and populations are starting to decrease in the south Basin but are still peaked in the north Basin. Severe downy mildew observed in an Allium fistulosum seed crop in north Basin. Further reports of bacterial foliage/soft rot problems in some bulb crops..