June 23, 2017

Krishna Mohan – Idaho State Commentary – Onion ipmPIPE

onion bulbs

Onion ipmPIPE 2013 ID State Commentary 05 Jun

Idaho Commentary

Onion Crop Growth Stage and Status Last Modified: 06/05/13

Onion crop development is normal, mostly 5 to 6 leaf stage. Low levels of thrips infestation. No

significant disease or pest problems. A fee fields show herbicide-related damage.

 

Weather Impacts (temperature, rain, hail, freezing) Last Modified: 06/05/13

Weather conditions are normal for this time of the year.

 

Insect Scouting, Outlook and Management Last Modified: 06/05/13

Thrips

Survey of the four sentinel (observation) plots: Average number of thrips (larvae + adults) per

plant varied between 2 and 7.

Maggots

No surveys or reports at this time

Other

No surveys or reports at this time

 

Disease Scouting, Outlook and Management Last Modified: 06/05/13

Iris yellow spot virus

No symptoms have been observed.

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

No significant problems have been observed.

Fungal Diseases (purple blotch, downy mildew, Botrytis)

No significant problems were observed

Bacterial Diseases (Xanthomonas, center rot, soft rots)

No surveys or reports at this time

 

Onion Pathologist

S. Krishna Mohan

Professor of Plant Pathology

University of Idaho

Email:kmohan@uidaho.edu

Lindsey du Toit – WA OR State Commentary – Onion ipmPIPE

onion_flowers

2012 WA Commentary 8-11-2012

WASHINGTON and OREGON Columbia Basin Onion Commentary

 

Onion Crop Growth Stage and Status Last Modified: 08/11/12

Crops are at stage 7 in Sentinel Plots in the south and north Columbia Basin. The crops look good overall. Undercutting, topping, field curing, and even harvest have begun for some spring-sown crops in the south Basin. Most onion seed crops have been swathed for harvest.

 

Weather Impacts (temperature, rain, hail, freezing) Last Modified: 08/11/12

Late July and the first half of August have been quite warm in the Columbia Basin (highs in the 90’s to 100’s F), typical for this time of year.

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

Central Washington precipitation outlook (2-4 weeks): average (no rain for this region)*

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

 

Insect Scouting, Outlook and Management Last Modified: 08/11/12

Thrips: Thrips numbers in Sentinel Plots averaged 7-12/plant in the south Columbia Basin, and 16-17/plant in the north Basin, a decline since the last regional report.

 

Maggots: No maggot damage to report this time of year.

 

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

 

Disease Scouting, Outlook and Management Last Modified: 08/11/12

Iris yellow spot virus: No symptoms in the Sentinel Plots. Not much to report from commercial crops either, although a few IYSV samples have been received at the Oregon State University Hermiston AREC.

 

Soil-borne Diseases (damping-off, pink root, Fusarium, Rhizoctonia): 2% of the plants in one Sentinel Plot in the south Columbia Basin are infected with pink root.

 

Fungal Diseases (purple blotch, downy mildew, Botrytis): No further incidences since the last regional report.

 

Bacterial Diseases (Xanthomonas, center rot, soft rots): Symptoms of bacterial soft rot were observed in several overhead irrigated bulb crops in the Columbia Basin at a wide range of incidences, including at 1% in one of the Sentinel Plots in the south Basin. Frequent rain events and occasional hail storms in mid-July may have exacerbated bacterial infections.

 


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