June 23, 2017

Krishna Mohan – ID State Commentary – Onion ipmPIPE

Onion ipmPIPE 2012 ID State Commentary 29 Jun

 

Idaho Commentary

 

Onion Crop Growth Stage and Status Last Modified: 06/29/12

Onion crop development is normal, plants mostly developmental stage 4 and a few in stage 5.

 

Weather Impacts (temperature, rain, hail, freezing) Last Modified: 06/29/12

Weather continues to be generally hot and dry.

 

Insect Scouting, Outlook and Management Last Modified: 06/29/12

Thrips

Survey of the four sentinel (observation) plots: Average number of adults per plant ranged from

6 to 22.  Average number of larvae per plant ranged from 16 to 49.  Symptoms of significant

thrips damage was evident in many plants.

 

Maggots

No surveys or reports at this time

 

Other

No surveys or reports at this time

 

Disease Scouting, Outlook and Management Last Modified: 06/29/12

Iris yellow spot virus

Low level of incidence (<1% plants) of IYSV symptoms were observed in one of the four

sentinel plots.  Low incidence of IYSV symptoms were observed in a few commercial onion

bulb fields.  Some onion seed fields (planted in Fall 2011) showed extensive incidence (more

than 60% plants with symptoms) of IYSV.  In a seed production field, extensive losses are

observed because more than 50% scapes with severe IYSV lesions toppled over because of

umbel weight even before seed set.

 

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

No surveys or reports at this time

 

Fungal Diseases (purple blotch, downy mildew, Botrytis)

No surveys or reports at this time

 

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

 

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