Potato Late Blight Forecasts

 

 

University of Idaho Late Blight Control Recommendations for September 17, 2004

Late blight has been diagnosed in Idaho.  Late blight has been found in Fremont County and Madison County, east and west of Rexburg.  Other areas with confirmed late blight include, Power County, southern Bingham County and an area near Blackfoot.  Late blight has also been confirmed in Cassia and Minidoka Counties.

 

Late blight in the field must be managed up to harvest.  Fungicide protection is needed as long as vines are green.  Research has not shown any desiccation method to be superior to any other with respect to preventing tuber blight.  Tuber infections can occur any time during the year.  The principle behind killing vines is to reduce the time tubers can be exposed to spores coming from sporulating lesions in the canopy.

 

We also want growers to be aware that tuber blight infections are being found during harvest.  It is very important to make sure vines are completely dead before harvest and that tubers have been allowed to obtain good skin set.

 

Harvesting in wet, rainy conditions can increase the likelihood for tuber infection if infected green vines are near the harvested field.  As a result, harvesting in the rain should be avoided at all costs if you are near “living” fields with late blight.

 

The University of Idaho is investigating pink rot, if you see anything unusual in your tubers send samples to Dr. Jeff Miller in Aberdeen.  He can be reached by calling 397-4181.

 

For southwestern Idaho and Malheur Co. Oregon the number to reach university personnel is 722-6701.

 

University personnel in south central Idaho can be reached at 736-3600. 

 

For southeastern Idaho, the number for University personnel is 529-8376 or 785-8060 or 397-4181. 

 

 

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If you have any questions or comments, please send e-mail to jhughes@uidaho.edu
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