June 23, 2017

Dan Drost – Utah State Commentary – Onion ipmPIPE

onion 3

Utah Commentary9-9

Utah Commentary

 

Onion Crop Growth Stage and Status Last Modified: 09/09/12

Onion growth in growth stage 9 with tops more than 50% down.  Growers have completed water

applications for the year and many are preparing for lifting.  Some growers have seeded fields

lifted but none are harvested yet.

 

Weather Impacts (temperature, rain, hail, freezing) Last Modified: 09/09/12

Weather conditions over last two weeks about normal.  Day temperatures were in low 90’s and

nights cooling into the 60’s. No rain or severe weather experienced.

 

Insect Scouting, Outlook and Management Last Modified: 09/09/12

Thrips

Final thrips samples taken in all sentinel fields. No information to report.

 

Maggots

None reported at this time

 

Other

None reported at this time

 

Disease Scouting, Outlook and Management Last Modified: 09/09/12

Iris yellow spot virus

IYSV incidences found throughout Utah onion production areas.

 

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

Fields continue to show evidence of patchy pink root and basal rot. Tip dieback evident where

PR and BR severe.

 

Fungal Diseases (purple blotch, downy mildew, Botrytis)

Some minor damage from purple blotch noted but quite isolated.

 

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

Mary Hausbeck – Michigan State Commentary – Onion ipmPIPE

onion-flowers

2012_09_06_Michigan_ipmOnion_Report[9]

 

MICHIGAN Commentary

Onion Crop Growth Stage and Status Last Modified: 09/06/12

Remaining crops are very near the harvesting stage. Leaves are drying and bulbs have nearly reached their final size.

Weather Impacts (temperature, rain, hail, freezing) Last Modified: 09/06/12

Temperatures have slightly increased. High temperatures were in the upper 80s in a northern site and the 80s to lower 90s in a southern site, while low temperatures ranged in the mid 40s to mid 60s in both sites. A few showers, with 0.55 and 0.95 inch of total rainfall, occurred in all sites in past two weeks.

Insect Scouting, Outlook and Management Last Modified: 09/06/12

Thrips

Roughly 15% incidence of plants with thrips was observed. Each plant had a very low thrips population.

Maggots

None found in surveys or reported at this time.

Other

None found in surveys or reported at this time.

Disease Scouting, Outlook and Management Last Modified: 09/06/12

Iris yellow spot virus

Typical IYSV lesions showing necrotic, diamond-shaped lesions with a green halo have been observed in a field located in a southern site. However, some lesions were not obviously diamond-shaped but were irregular-shaped. This may be caused by multiple infections coalescing into unusually shaped and larger lesions.

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

Pink root has been found in nearly all the fields across the state. Incidence of pink root was very high in every field observed. Above-ground symptoms of pink root are observed as a die-back or a premature senescence of foliage across leaves of all ages. Severely infected plants have reduced bulb size.

Fungal Diseases (purple blotch, downy mildew, Botrytis)

Anthracnose, caused by the pathogen Colletotrichum coccodes, was detected and confirmed. It is widespread in the Grant area. In addition, it was a major problem in the last couple of years within fields across the state.

Purple blotch, a foliar disease caused by a fungus called Alternaria porri, has been found with low incidence. The disease was observed on the plants late in this season, especially after the temperatures cooled down and frequent rain occurred.

Stemphylium leaf blight has been observed more frequently compared to previous scouting. High incidence was observed in onion fields that had experienced hail damage and more frequent rains.

Bacterial Diseases (Xanthomonas, center rot, soft rots)

Fields with these disease problems have been harvested. Some sampling from the bulk crates being stored in the fields has occurred in an effort to explore Michigan’s bacterial disease problem on onions in more depth. Onion Specialist Mary Hausbeck Professor and Extension Specialist Michigan State University Email:hausbec1@msu.edu

 

Dan Drost – Utah State Commentary – Onion ipmPIPE

onion 3

Utah Commentary8-25

 

Utah Commentary

Onion Crop Growth Stage and Status Last Modified: 08/25/12

Onion growth with most fields in growth stage 7 with tops beginning to go down. Transplanted onions are fully harvested. Growers have sufficient water to deal with irrigation needs and continue to irrigate to finish the crop. Growers report that seeded crop harvest should begin around the 1st of September. Most are happy with the growth and sizing should be very good.

Weather Impacts (temperature, rain, hail, freezing) Last Modified: 08/25/12

Warm temperature conditions were experienced over last two weeks. Day temperatures were near normal during the period with temperatures in low to mid 90’s for much of the period. No severe weather experienced (rain, hail).

Insect Scouting, Outlook and Management Last Modified: 08/25/12

Thrips

Thrips populations continue to decrease in all sentinel fields. Final samples taken.

Maggots

None reported at this time

Other

None reported at this time

Disease Scouting, Outlook and Management Last Modified: 08/25/12

Iris yellow spot virus

IYSV incidences found throughout Utah onion production areas with incidence building.

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

Some fields showing patch pink root and basal rot. Left tips dieback evident where PR and BR severe.

Fungal Diseases (purple blotch, downy mildew, Botrytis)

Some minor damage from purple blotch noted but quite isolated at this time. Left tips dieback evident though not always associated with PB.

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

 

Brian Nault – NY State Commentary – Onion ipmPIPE

onion-clean-FD-lg

2012 -NY Report – August 24

Onion ipmPIPE website regional report

 

New York State Report  – August 24, 2012

 

Onion Crop Growth Stage and Status:

Most onions have matured two to three weeks earlier than normal and all leaves are down.  Fields continue to be harvested and in most cases bulb size has been smaller than desired, but quality continues to be excellent.

 

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

Still drier than normal, but temperatures have been normal.

 

Insect Scouting, Outlook and Management: 

Maggots:  None observed from third generation.

Thrips:  Thrips pressure is high only in the few fields that are not yet mature.  The dry and hot growing season was the perfect recipe for a bad year for thrips.  Despite this challenge, most growers were successful in managing thrips with the available insecticides and IRM guidelines for using them.

 

Disease Scouting, Outlook and Management: 

Iris yellow spot virus:  Yes, IYSV was observed along field edges before crop maturation.  The shorter than anticipated growth of the onion crop truncated the spread of IYSV within and among onion fields.  Consequently, the incidence of IYSV in New York onion fields was considered mild this season.

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 uncommon, while purple blotch incidence is moderate to high in spots.  Downy mildew is not present.  Growers are using Bravo and Scala for disease control.

Bacterial Diseases (Xanthomonas, center rot, soft rots):  Present at 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

 

Mary Hausbeck – Michigan State Commentary – Onion ipmPIPE

onion-flowers

2012_08_10_Michigan_ipmOnion_Report [7]

MICHIGAN Commentary
Onion Crop Growth Stage and Status Last Modified: 08/10/12
Vegetative phase of most onions have nearly reached the end as the outer leaves have continued to dry out. Some early varieties have started to top over.

Weather Impacts (temperature, rain, hail, freezing) Last Modified: 08/10/12
Several events of scattered rain have occurred. Total rainfall in past two weeks across the monitored sites was generally between 0.72 and 1.32 inches. Temperatures in the northern sites were high from 69 to 93F and low from 54 to 71F, while temperatures in the southern sites were high from 72 to 95F and low from 49 to 71F.

Insect Scouting, Outlook and Management Last Modified: 08/10/12
Thrips
Average thrips numbers were low in some areas with one to two per plant since as an insecticide was sprayed a few day prior to the scouting. However, thrips numbers in one field located in the northern site was high with 19 per plant.
Maggots
None found in surveys or reported at this time.
Other
None found in surveys or reported at this time.

Disease Scouting, Outlook and Management Last Modified: 08/10/12
Iris yellow spot virus
Iris yellow spot virus was found in a site reported previously with the incidence appearing to increase; more diseased plant have been detected.

Soil-borne Diseases (Damping Off, Pink Root, Fusarium)
Smut has been identified in more mature plants showing dark spores forming in the leaf whorl and scale tissues. The dieback of the foliage as a result is obvious.
High incidence of pink root has been found in nearly of all the scouted fields. Aboveground symptoms show the dieback of the leaf tips. Small bulbs have formed on these stunted plants. Below ground symptoms indicate severe infection and damage to nearly the entire root system.

Fungal Diseases (purple blotch, downy mildew, Botrytis)
Stemphylium leaf blight was prevalent in many sentinel plots, while other foliar diseases including purple blotch and anthracnose have been found at low incidence.

Bacterial Diseases (Xanthomonas, center rot, soft rots)
Stalk and leaf necrosis (or leaf blight and bulb rot) caused by Pantoea agglomerans has been recently detected at a damage level of 2 out of 5 (~8%) in a field at the southern site. Symptoms include blighting and withering on the leaves. In addition, infected leaves appear to be watersoaked.

Onion Specialist Mary Hausbeck Professor and Extension Specialist Michigan State University Email:hausbec1@msu.edu

Brian Nault – NY State Commentary – Onion ipmPIPE

onion-clean-FD-lg

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

 

Dan Drost – Utah State Commentary – Onion ipmPIPE

onion 3

 

 

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

Mary Hausbeck – Michigan State Commentary – Onion ipmPIPE

onion-flowers

2012_07_26_Michigan_ipmOnion_Report[6]

MICHIGAN Commentary
Onion Crop Growth Stage and Status Last Modified: 07/26/12
Overall onions were at stages 6 and 7 with bulb diameters between 1 and 3 inches. Fields have needed irrigation due to drought conditions.

Weather Impacts (temperature, rain, hail, freezing) Last Modified: 07/26/12
For northern sites of Michigan, high temperatures were in the upper 80s to mid 90s. Low temperatures ranged from the upper 60s to 70s. Month to date precipitation was 1.21 inches. For the southern sites, high temperatures ranged from 80s to upper 90s, while low temperatures were in mid 50s to 80s. Total precipitations ranged from 0.76 to 1.45 inches.

Insect Scouting, Outlook and Management Last Modified: 07/26/12
Thrips
Thrips numbers in the northern sites have slightly decreased to the range of 2 to 4 per plant when compared to previous scouting, while the numbers in the southern sites ranged from 2 to 6 per plant.
Maggots
None found in surveys or reported at this time.
Other
None found in surveys or reported at this time.

Disease Scouting, Outlook and Management Last Modified: 07/26/12
Iris yellow spot virus
Monitoring for IYSV revealed that iris yellow spot incidence remained in the fields detected previously. In addition, it has been found in an additional field in a southern site.

Soil-borne Diseases (Damping Off, Pink Root, Fusarium)
Incidence of pink root has been detected in both northern and southern sites. In some sites, the severity appears to be quite high.

Fungal Diseases (purple blotch, downy mildew, Botrytis)

Foliar diseases including anthracnose, purple blotch, and Stemphylium leaf blight have been observed. Disease incidence varied between two regions. Incidence of anthracnose was high in northern sites, while incidence of Stemphylium leaf blight was high in southern sites. Overall, foliar disease severity is lower this season compared to other years due to the drought conditions currently being experienced.

Bacterial Diseases (Xanthomonas, center rot, soft rots)
None found in surveys or reported at this time.

Onion Specialist Mary Hausbeck Professor and Extension Specialist Michigan State University Email:hausbec1@msu.edu

Mary Hausbeck – Michigan State Commentary – Onion ipmPIPE

onion-flowers

2012_07_12_Michigan_ipmOnion_Report[5]

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

Development of onions in southern sites is mostly at stages 5 and 6, while the development of onions in northern sites is at stages 4 to 6.

Weather Impacts (temperature, rain, hail, freezing) Last Modified: 07/12/12
There was no precipitation in all sites during June 29th to July 3rd. Average temperatures were high at 90F in northern sites and 88F in southern sites, but low at 67F in both sites. Hail storm occurred at night, July 3rd, in Grant.

Insect Scouting, Outlook and Management Last Modified: 07/12/12
Thrips
Thrips numbers and incidence continue to increase. The counts of thrips in northern sites of Michigan ranged from 2.9 to 6.8 per plant, while numbers in southern sites ranged from 1.2 to 5.0 per plant.
Maggots
None found in surveys or reported at this time.
Other
1 to 3% of leaf miner has been detected from a few sites.

Disease Scouting, Outlook and Management Last Modified: 07/12/12
Iris yellow spot virus
IYSV has been found in both northern and southern sites. In addition, IYSV samples were detected from a field in Fremont where is not included in survey plots.

Soil-borne Diseases (Damping Off, Pink Root, Fusarium)
Pink root has increased in all sites.

Fungal Diseases (purple blotch, downy mildew, Botrytis)
Purple blotch has been detected from southern sites of Michigan.

Bacterial Diseases (Xanthomonas, center rot, soft rots)
None found in surveys or reported at this time.

Onion Specialist Mary Hausbeck Professor and Extension Specialist Michigan State University Email:hausbec1@msu.edu

Lindsey du Toit – Washington State Commentary – Onion ipmPIPE

onion_flowers

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