June 24, 2017

Howard Schwartz – CO State Commentary – Onion ipmPIPE

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 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.


No reports at this time


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