June 23, 2017

Howard Schwartz – CO State Commentary – Onion ipmPIPE

onion 2

CO Commentary (09-07-12)

 

COLORADO Commentary

Onion Crop Growth Stage and Status Last Modified: 09/07/12

Thrips pressure is dropping off as plants mature in Eastern, Southern and Western Regions of the state. Risk Models show that Thrips and IYSV are at Mium to High Risk, while foliar bacterial and fungal threats remain at Medium Risk in most regions due to persistent high temperatures and low moisture conditions.

Weather Impacts (temperature, rain, hail, freezing) Last Modified: 09/07/12

Most regions of the state received little or no rain in the last week. Temperatures have averaged in the mid 80s to low 90s during the day, and mid 50s to low 60s in the evening.

Temperature Outlook* [2 – 4 weeks]: Normal

Precipitation Outlook* [2 – 4 weeks]: Normal

*Courtesy of Planalytics, Inc.

Insect Scouting, Outlook and Management Last Modified: 09/07/12

Thrips – Populations declining in most fields as plants approach maturity.

Maggots – No reports at this time Other – No other reports at this time.

Disease Scouting, Outlook and Management Last Modified: 09/07/12

Iris yellow spot virus – IYSV detected in surveys of seeded onions (trace to more than 75%) sampled in northern and southern regions.

Soil-borne Diseases (Damping Off, Pink Root, Fusarium) – Pink Root and Fusarium basal rot incidence light to moderate in affected fields throughout the state.

Fungal Diseases (purple blotch, downy mildew, Botrytis) – No reports at this time. Late-season fungicide protection of foliage and necks is recommended for storage rot control; combined with good curing of onions in the field and storage.

Bacterial Diseases (Xanthomonas, center rot, soft rots) – Surveys from all regions detected trace soft rot and leaf blight infections. Late-season bactericide protection of foliage and necks is recommended for storage rot control; combined with good curing of onions in the field and storage.

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 State Commentary – Onion ipmPIPE

onion 2

CO Commentary (07-27-12)

COLORADO Commentary
Onion Crop Growth Stage and Status Last Modified: 07/27/12
Thrips pressure remains moderate to high in Eastern, Southern and Western Regions of the state. Risk Models show that Thrips and IYSV are at High Risk, while foliar bacterial and fungal threats remain at Medium Risk in most regions due to persistent high temperatures and low moisture conditions.

Weather Impacts (temperature, rain, hail, freezing) Last Modified: 07/27/12
Most regions of the state received little or no rain in the last week. Temperatures have averaged in the upper 80 to low 90s during the day, and upper 50s to mid 60s 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: 07/13/12
Thrips – Surveys detected up to 60 (larvae + adult) thrips in commercial fields on transplants or seeded onions.
Maggots – No reports at this time
Other – No other reports at this time.

Disease Scouting, Outlook and Management Last Modified: 07/27/12
Iris yellow spot virus – IYSV detected in surveys of transplanted and seeded onions (trace to nearly 40%) sampled in northern and southern regions.
Soil-borne Diseases (Damping Off, Pink Root, Fusarium) – Pink Root was confirmed in 10 % of seeded onions sampled in northern and southern Colorado recently. Fusarium basal rot present at less than 5% in affected fields throughout the state.
Fungal Diseases (purple blotch, downy mildew, Botrytis) – No reports at this time
Bacterial Diseases (Xanthomonas, center rot, soft rots) – Surveys from all regions detected trace soft rot and leaf blight infections.

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