UW Extension Ag Weather

Potato Image from Fir0002/Flagstaffotos

Image licensed under the GNU Free Documentation License by Fir0002/Flagstaffotos

Potato Development

Our potato Pday model lets you predict plant development of this pest to better manage production.

Potato Pests

For information on potato pests such as the Colorado Potato Beetle, see our degree-day calculator page.

Potato Development


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P-Days are the unit of thermal time used in a number of University of Wisconsin-Extension potato management products. To learn more about these products, visit UW's Integrated Pest Management site.

Below you will find P-Day maps for:

  1. May 15 to the present
  2. May 1 to May 14
  3. May 7 to May 14
You can correct P-Day values from the May 15 starting date map (Map 1) for your planting date by adding additional P-Days from Map 2 or Map 3 as appropriate.

Earlier P-Day Maps (available mid-May)