Potato Pest/Stress Summary:

As of January 2006, we are no longer updating these potato resource pages.

Indicates new or upgraded reports during the last week

REGION	Early Blight	Late Blight	Psyllid	Heat Stress
Disease/Insect Forecast Threshold:
Northern Front Range Area	1st Reports	No Reports	No Reports	Limited Reports
Ft. Morgan Area	1st Reports	No Reports	No Reports	Limited Reports
Yuma Area	1st Reports	No Reports	No Reports	Limited Reports
Wray Area	1st Reports	No Reports	No Reports	Limited Reports

Potato Late Blight:
The potato late blight model threshold values have been exceeded for all fields emerged by 6/15/2005 north of Interstate 70, and east of Interstate 25 in Colorado.

Potato Early Blight:
The potato early blight model threshold values have been exceeded for nearly all fields emerged by 6/15/2005 north of Interstate 70, and east of Interstate 25 in Colorado.

Disease/Pest Threats:

Potato Early Blight (Alternaria solani) and
Brown Spot or Alternata Blight (Alternaria alternata)

 

Potato Psyllids

IPM Responsive Strategy:

SUMMARY OF Potato Disease IPM STATEGIES:

1. Rotate out of potatoes for at least 2 years.
2. Eliminate potato debris, culls and sources of volunteer potatoes.
3. Plant high quality, certified, treated seed of disease resistant varieties, if available and suitable for your market needs.
4. Follow recommended production practices to avoid stress from extremes of moisture, temperature, and soil compaction.
5. Manage water and fertilizer inputs to provide adequate, but not excess components for the crop need to avoid excess canopy development.
6. Carefully scout fields to detect foliar infection as early as possible, get confirmation of disease diagnosis from appropriate experts.
7. Monitor reports on weather patterns, disease forecasts, and confirmed sightings in your region via the CSU VegNet.
8. When infection is confirmed in or near your field, implement a timely program of fungicides and bactericides with protectant and systemic modes of action. Rotate appropriate fungicide chemistry, apply labeled rates, and stay within recommended spray intervals.
9. Complete vine kill 3 weeks prior to harvest is essential for good skin set and to reduce or eliminate spore spread from infected foliage to tubers. VigorOx 15 F&V (Peroxyacetic Acid and Hydrogen Peroxide) can be applied as a post-harvest spray or dip to reduce storage molds. Monitor storage facilities for evidence of hot or wet spots, and rely upon air movement to dry tubers and reduce decay of potatoes that are known to be infected by pathogens.
10. Thoroughly incorporate each season's crop debris + pathogens to reduce carryover and potential disease pressure the following season. Rely upon cultivation and herbicide in next year's rotation crop to reduce volunteer potato emergence and possible infection by pathogens which can then be spread to next year's host crop.