June 24, 2017

Krishna Mohan – Idaho State Commentary – Onion ipmPIPE

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