June 24, 2017

Howard Schwartz – CO State Commentary – Onion ipmPIPE

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COLORADO Commentary

Onion Crop Growth Stage and Status Last Modified: 06/28/13

Overall, onion acres are down considerably in SE Colorado (into western Kansas) due to the persistent drought conditions. In general, transplanted onions are nearing the bulbing phase and seeded onions are about 2 – 4weeks from bulbing depending on location.

 

Weather Impacts (temperature, rain, hail, freezing) Last Modified: 06/28/13

No reports of any storm damage occurring in onion regions.

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

Precipitation Outlook* [2 – 4 weeks]: Average

*Courtesy of Planalytics, Inc.

 

Insect Scouting, Outlook and Management Last Modified: 06/28/13

Thrips

Thrips levels are starting to increase past established thresholds and growers are starting control measures (primarily Movento). Thrips numbers range from 5 – 26 per plant in northern and 20 per plant in southern Colorado.

Maggots

No surveys or reports at this time

Other

No surveys or reports at this time

 

Disease Scouting, Outlook and Management Last Modified: 06/28/13

Iris yellow spot virus

No reports at this time

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

No reports at this time

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