Crop & Pest Report

Accessibility


| Share

Potato Diseases in Cool and Wet Soils (06/06/13)

Many growers who planted potatoes a few weeks ago have yet to see potatoes emerging because of the cool soil temperatures. Not only does the weather slow down growth, but it favors bacterial seed decay and Rhizoctonia stem canker of the emerging sprouts.

Potato Diseases in Cool and Wet Soils

Many growers who planted potatoes a few weeks ago have yet to see potatoes emerging because of the cool soil temperatures. fusarium_dry_rot.bacterial_soft_rot.secor.pngNot only does the weather slow down growth, but it favors bacterial seed decay and Rhizoctonia stem canker of the emerging sprouts. There is little that can be done for planted potatoes to manage these diseases. However, if planting has not yet taken place NDSU research recommends managing seed-borne Rhizoctonia by applying a seed treatment such as Maxim, Emesto Silver or mancozeb plus either Quadris or Moncut in furrow if fields have a history of potato production. We encourage planting practices that encourage the quickest emergence from the soil, such as shallower planting and smaller hills. Planting seed free of soft rot and low levels of Rhizoctonia will minimize emergence problems. One of the best things to reduce disease incidence is getting sunshine and warmer temperatures so the potatoes can emerge from the soil.

black_leg_or_soft_rot_potato.secor.png

black_scurf_or_seed_borne_rhizoctonia.secor.png

rhizoctonia_stem_canker.secor.png

 

Andy Robinson
NDSU/U of M Extension Potato Agronomist

 

Gary Secor

Plant Pathologist

Creative Commons License
Feel free to use and share this content, but please do so under the conditions of our Creative Commons license and our Rules for Use. Thanks.