June 24, 2017

Howard Schwartz – CO State Commentary – Onion ipmPIPE

onion 2

CO Commentary (08-09-13)

 

COLORADO Commentary

Onion Crop Growth Stage and Status Last Modified: 08/09/13

Bulbing stages continue to develop normally in transplanted and seeded onions throughout the onion regions in the state.

Weather Impacts (temperature, rain, hail, freezing) Last Modified: 08/09/13

Severe storm damage affected many onion fields in northern Colorado, causing 50 to 75% defoliation with evidence of bulb rots beginning to develop within 7 to 10 days later.

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: 08/09/13

Thrips

Thrips numbers range between 25 to 50 per plant in most production regions of Colorado; while the numbers are beginning to fall in fields approaching maturity.

Maggots

No reports at this time

Other

No reports at this time

Disease Scouting, Outlook and Management Last Modified: 08/09/13

Iris yellow spot virus

Scattered positive reports with ELISA or PCR testing, but no serious outbreaks reported yet.

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

Pink root and Fusarium basal rot apparent in some fields with a history of the disease.

Fungal Diseases (purple blotch, downy mildew, Botrytis)

No reports at this time

Bacterial Diseases (Xanthomonas, center rot, soft rots)

No 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

 

Dan Drost – Utah State Commentary – Onion ipmPIPE

onion 3

Utah Commentary 8-8

 

Utah Commentary

Onion Crop Growth Stage and Status Last Modified: 08/8/13

Plant growth considered good to excellent but many fields showing some early maturity (advanced over more normal years). Most fields have bulbs in the 2+ inch size. Growers busy irrigating (no water shortages reported but several noted that irrigation companies preparing for shortages). Transplant fields scheduled to be harvested being in the next week.

Weather Impacts (temperature, rain, hail, freezing) Last Modified: 08/8/13

The Utah weather continues to be very hot with temperatures upper 90’s to low 100’s. Local records continue to be broken. Temperatures above normal expected to continue for the next week to 10 days. No rain reported in last two weeks. Soils moisture considered good as growers continue with irrigation.

Insect Scouting, Outlook and Management Last Modified: 08/8/13

Thrips

Field surveys on-going. Thrips populations remain high with counts of ranging from 3-15 adult per plant (average 4-5/plant) and 10-120 larvae per plant (average 40-50/plant). Growers are actively spraying to help control thrips. Thrips being controlled adequately when treated with insecticides but fields with high thrips counts associated with growers who purposely do not spray as often.

Maggots

None reported at this time

Other

None reported at this time

Disease Scouting, Outlook and Management Last Modified: 08/8/13

Iris yellow spot virus

Early indications of IYSV (visual) in storm damaged fields. Some symptoms noted in fields that are more stressed.

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

Pink root found in fields with history of onion production.

Fungal Diseases (purple blotch, downy mildew, Botrytis)

None reported at this time

Bacterial Diseases (Xanthomonas, center rot, soft rots)

Suspected soft rots in hail damaged field which will need confirmation. Onion Specialist Daniel Drost Professor of Horticulture Utah State University Email: dan.drost@usu.edu

 

Krishna Mohan – Idaho State Commentary – Onion ipmPIPE

spring_onionR

Onion ipmPIPE 2013 ID State Commentary 08 Aug

 

Idaho Commentary

Onion Crop Growth Stage and Status Last Modified: 08/08/13

Onion crop development is normal, mostly Stage 8. Generally high level of thrips populations and significant thrips feeding injury to the leaves and widespread incidence of IYSV symptoms observed in many fields.

Weather Impacts (temperature, rain, hail, freezing) Last Modified: 08/08/13

Daytime mean high temperature between low to high 90s F. No significant precipitation.

Insect Scouting, Outlook and Management Last Modified: 08/08/13

Thrips

Survey of the four sentinel (observation) plots: Average number of thrips (larvae + adults) per plant varied between 47 and 70. Some growers’ fields show severe leaf damage due to thrips feeding, and drying-up of leaves.

Maggots

No surveys or reports at this time

Other

No surveys or reports at this time

Disease Scouting, Outlook and Management Last Modified: 08/08/13

Iris yellow spot virus

Widespread incidence of presumptive IYSV symptoms in many fields. In some growers’ fields, these IYSV symptoms led to moderately severe drying of leaves.

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

Limited areas with Fusarium plate rot/root rot symptoms have been noted in a couple of growers’ fields.

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

 

Mary Hausbeck – Michigan State Commentary – Onion ipmPIPE

onion-flowers

Michigan 07282013

  • The most significant problems were the bacterial diseases.

–          Bacterial leaf blight and bulb rot caused by Pantoea agglomerans was detected and confirmed using BIOLOG.

–          Two other types of symptoms were showing 1) the third leaf dead and 2) the newly emerging (center) leaf dead and/or interior rotting of the bulb part.

–          The two unidentified diseases and more bacterial leaf blight and bulb rot samples are being processed and identified.

  • Incidence of pink root and anthracnose has increased.
  • Other fungal diseases were not significant.
  • IYSV was still detected but with low incidence.
  • Thrips populations were low.

 

 

Dan Drost – Utah State Commentary – Onion ipmPIPE

onion 3

Utah Commentary 7-26

 

Utah Commentary

Onion Crop Growth Stage and Status Last Modified: 07/26/13

Plant growth considered normal with onions with good top growth but maturity slightly advanced over normal. Most fields have bulbs in the 1½ to 2 inch size. Growers busy irrigating (no water shortages reported but they are anticipated). Most fields have been hand weeded and crews are continuing to clean up problem areas. Fields with leaf damage from localized hail are turning brown (tip drying) due to damage.

 

Weather Impacts (temperature, rain, hail, freezing) Last Modified: 07/26/13

The Utah weather continues to be very hot with temperatures upper 90’s to low 100’s (record setting heat continues). Temperatures are about 10 degrees above average. No rain reported in last two weeks. Soils moisture considered good as growers continue with irrigation. Continued hot dry conditions expected with periodic returns of monsoonal weather patterns (strong winds, heavy rain and possible hail).

 

Insect Scouting, Outlook and Management Last Modified: 07/26/13

Thrips

Field surveys on-going. Thrips populations steadily increasing with counts of ranging from 1-11 adult per plant (average 3.5/plant) and 3-104 larvae per plant (average 41/plant). Growers are using their personal spray schedules to control thrips. In general, thrips being controlled adequately when treated though some fields have very high pressure levels and feeding injury.

Maggots

None reported at this time

Other

None reported at this time

 

Disease Scouting, Outlook and Management Last Modified: 07/26/13

Iris yellow spot virus

Early indications of IYSV (visual) in storm damaged fields but needs additional confirmation.

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

Pink root noted in two fields in Davis Co (patchy) with history of onion production.

Fungal Diseases (purple blotch, downy mildew, Botrytis)

None reported at this time

Bacterial Diseases (Xanthomonas, center rot, soft rots)

None reported at this time

Onion Specialist Daniel Drost Professor of Horticulture Utah State University Email: dan.drost@usu.edu

 

Howard Schwartz – CO State Commentary – Onion ipmPIPE

onion 2

CO Commentary (07-26-13)

 

COLORADO Commentary

Onion Crop Growth Stage and Status Last Modified: 07/26/13

Bulbing stages continue to develop normally in transplanted and seeded onions throughout the onion regions in the state.

 

Weather Impacts (temperature, rain, hail, freezing) Last Modified: 07/26/13

No reports of any storm damage occurring in onion regions.

Temperature Outlook* [2 – 4 weeks]: Average

Precipitation Outlook* [2 – 4 weeks]: Average to Below Average

*Courtesy of Planalytics, Inc.

 

Insect Scouting, Outlook and Management Last Modified: 07/26/13

Thrips

Thrips levels are past established thresholds and growers are continuing to use various insecticide control measures. Thrips numbers range between 25 to 50 per plant in most production regions of Colorado.

Maggots

No reports at this time

Other

No reports at this time

 

Disease Scouting, Outlook and Management Last Modified: 07/26/13

Iris yellow spot virus

Scattered positive reports with ELISA or PCR testing, but no serious outbreaks reported yet.

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

Pink root and Fusarium basal rot apparent in some fields with a history of the disease.

Fungal Diseases (purple blotch, downy mildew, Botrytis)

No reports at this time

Bacterial Diseases (Xanthomonas, center rot, soft rots)

No reports at this timeState 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

 

Krishna Mohan – Idaho State Commentary – Onion ipmPIPE

onion bulbs

Onion ipmPIPE 2013 ID State Commentary 25 Jul

Idaho Commentary

 

Onion Crop Growth Stage and Status Last Modified: 07/25/13

Onion crop development is normal, mostly Stage 7. Generally high level of thrips populations and significant thrips feeding injury to the leaves observed in many fields.

 

Weather Impacts (temperature, rain, hail, freezing) Last Modified: 07/25/13

Daytime mean high temperature varying between 95 to 104 F. No significant precipitation.

 

Insect Scouting, Outlook and Management Last Modified: 07/25/13

Thrips

Survey of the four sentinel (observation) plots: Average number of thrips (larvae + adults) per plant varied between 37 and 74. Some growers’ fields show severe leaf damage due to thrips feeding, and drying-up of leaves.  

Maggots

No surveys or reports at this time

Other

No surveys or reports at this time

 

Disease Scouting, Outlook and Management Last Modified: 07/25/13

Iris yellow spot virus

Presumptive IYSV symptoms have been observed on a few plants in all of the sentinel plots and in some commercial fields. In a few growers’ fields, the IYSV symptoms were moderately severe

 

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

Limited areas with Fusarium plate rot/root rot symptoms have been noted in a couple of growers’ fields.

 

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 State Commentary – Onion ipmPIPE

onion_flowers

2013 WA – Onion ipmPIPE Commentary 7-24-2013

COLUMBIA BASIN OF NORTHCENTRAL OREGON AND CENTRAL WASHINGTON Commentary 7/24/2013

 

Onion Crop Growth Stage and Status Last Modified: 07/24/13

Onion crops are maturing rapidly with the very warm conditions in the Columbia Basin in July. Bulb crops in the north Columbia Basin are at the 5-6 growth stages (12 pairs of true leaves and bulb initiation), and in the south Basin most crops are at the 6-7 growth stages (bulb diameter of 1.0-1.75 inches and 1.75-3.0 inches = 2.0-4.0 cm and 4.0-7.5 cm diameter, respectively).

 

Seed crops of Allium fistulosum (bunching onion) have been harvested. A. cepa and CFC (‘cepa fistulosum cross’) seed crops are in late-bloom.

 

Weather Impacts (temperature, rain, hail, freezing) Last Modified: 07/24/13

July has been very warm in the Columbia Basin, with the result that thrips numbers have increased significantly.

 

Temperature Outlook* [next 2 – 4 weeks]:       average

Precipitation Outlook* [next 2 – 4 weeks]:        average to 30% below average

*Courtesy of Planalytics, Inc.

 

Insect Scouting, Outlook and Management Last Modified: 07/24/13

Thrips

Thrips populations have increased very rapidly in onion crops with the onset of very warm conditions through most of July. 100% of plants were infested in Sentinel Plots in the north and south Columbia Basin, with 3 to 35 thrips/plant detected in the north Basin Sentinel Plots, and 5-69 thrips/plant in the south Basin Sentinel Plots.

 

Maggots

No maggot problems reported at this time.

Other

None reported.

 

Disease Scouting, Outlook and Management Last Modified: 07/24/13

Iris yellow spot virus

Iris yellow spot virus has been detected in several onion bulb fields in the north and south Columbia Basin. In the north Basin, the infected crops are in relatively close proximity to onion seed crops infected with IYSV. Samples were submitted to the NOVL on 7/16/2013. Growers leasing ground have been advised to consider the location of biennial onion seed crops in the region to try and avoid a green bridge effect for movement of thrips and IYSV from seed crops to bulb crops.

 

Soilborne Diseases (Damping-off, pink root, Fusarium basal rot, etc.)

Pink root observed on 2-6% of the plants in Sentinel Plots in the south Columbia Basin.

 

Fungal Foliar Diseases (purple blotch, downy mildew, Botrytis)

No surveys or reports at this time.

 

Bacterial Diseases (Xanthomonas, center rot, soft rots)

A few growers reported bacterial-like symptoms in center-pivot irrigated bulb crops in the south Columbia Basin, but there has not yet been verification of the cause of the symptoms on samples tested in one lab. The NOBL in Pullman requested samples for further evaluation.

 

State Contact for Project
Lindsey du Toit
Professor of Plant Pathology

Washington State University
Email: dutoit@wsu.edu

 

Collaborators: Tim Waters, Carrie Wohleb, Jordan Eggers, Hanu Pappu, Brenda Schroeder,

Bill Dean

 

Chris Cramer – NM State Commentary – Onion ipmPIPE

onion 3

2013NewMexicoCommentary (07-24-13)

New Mexico Commentary

Onion Crop Growth Stage and Status Last Modified: 07/24/13

The spring sown-crop onion crop is now at growth stages 8-10 and harvest season is near its end.

Bulb yields and quality have been good as environmental conditions have been ideal. This will

be the final report from New Mexico for this year.

 

Weather Impacts (temperature, rain, hail, freezing) Last Modified: 07/24/13

Temperatures have been unseasonably cool (mid to high 80s) and chances of precipitation have

increased. The monsoon season has begun and recent precipitation may delay harvest slightly in

some areas.

Temperature Outlook* [2 – 4 weeks]: Normal

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

*Courtesy of Planalytics, Inc.

 

Insect Scouting, Outlook and Management Last Modified: 07/24/13

Thrips

Thrips numbers (adult and juvenile) ranged from 0 to 80 per plant with a mean of 14 per plant in

the final remaining unharvested sentinel plot (1).

Other

No reports at this time

 

Disease Scouting, Outlook and Management Last Modified: 07/24/13

Iris yellow spot virus

No reports at this time

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

Pink root has become more apparent in some sentinel plots as harvest draws nearer. However,

losses appear to be minor.

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

Chris Cramer

Professor of Horticulture

New Mexico State University

Email:cscramer@nmsu.edu

Collaborators: Mark Uchanski*, Mike Petersen

*Starting June 01, 2013 Mark Uchanski will serve as the state contact (uchanski@nmsu.edu).

Krishna Mohan – Idaho State Commentary – Onion ipmPIPE

onion bulbs

Onion ipmPIPE 2013 ID State Commentary 12 Jul

Idaho Commentary

 

Onion Crop Growth Stage and Status Last Modified: 07/12/13

Onion crop development is normal, mostly, Stage 7 (bulb diameter mostly 4-6 cm). Thrips populations increasing; significant thrips feeding injury to the leaves.

 

Weather Impacts (temperature, rain, hail, freezing) Last Modified: 07/12/13

Weather conditions are normal for this time of the year. Few isolated hail incidents.

 

Insect Scouting, Outlook and Management Last Modified: 07/12/13

Thrips

Survey of the four sentinel (observation) plots: Average number of thrips (larvae + adults) per plant varied between 18 and 56.   

Maggots

No surveys or reports at this time

Other

No surveys or reports at this time

 

Disease Scouting, Outlook and Management Last Modified: 07/12/13

Iris yellow spot virus

Presumptive IYSV symptoms have been observed on a few plants in all of the sentinel plots and in some commercial fields.

 

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