Imazapic/Cadre Carryover Symptoms in Sweetpotato

Stephen Meyers, Sweetpotato Extension Specialist
By Stephen Meyers, Sweetpotato Extension Specialist August 23, 2013 12:51

Imazapic/Cadre Carryover Symptoms in Sweetpotato

Cadre (active ingredient= imazapic) is an ALS-inhibiting herbicide registered for use in peanut.  The persistence of the herbicide, which has an average half-life of 120 days, requires growers pay particular attention to the herbicide’s rotational restrictions.  Fortunately, Cadre carryover injury to sweetpotato has been rare in 2013.  I recently found one field in Chickasaw County with sweetpotato plants exhibiting Cadre carryover symptoms.  This post is intended as a reference for growers who suspect Cadre carryover.  However, Cadre carryover symptoms in sweetpotato are very similar to numerous other biotic and abiotic diseases and/or disorders.

Sweetpotato plants affected by Cadre carryover will appear stunted.  Older growth is often chlorotic.  Newer growth is red with shortened internodes and stunted leaves.  Injury symptoms will often be more severe at the end of a row where the applicator slowed and applied a higher rate or where applications were overlapping.  Symptoms may also be more severe in portions of a field with higher soil pH, decreased clay content, or decreased organic matter content.  For sweetpotato, the herbicide label currently dictates a 26 month rotational restriction following Cadre application.  For more information on specific rotational restrictions for other crops, please see the product label.

Cadre-injured sweetpotato plant 3 months after planting.

Cadre-injured sweetpotato plant 3 months after planting.

Cadre-injured sweetpotato plant next to volunteer peanut.

Cadre-injured sweetpotato plant next to volunteer peanut.

The transition from injured plants (bottom) to healthy plants (top).

The transition from injured plants (bottom) to healthy plants (top).

 

Print Friendly
Stephen Meyers, Sweetpotato Extension Specialist
By Stephen Meyers, Sweetpotato Extension Specialist August 23, 2013 12:51
Write a comment

No Comments

No Comments Yet!

Let me tell You a sad story ! There are no comments yet, but You can be first one to comment this article.

Write a comment
View comments

Write a comment

Your e-mail address will not be published.
Required fields are marked*

Subscribe to receive updates

  • Soybean Harvest Aids

    Several calls have come in over the last week regarding soybean harvest aid options for various scenarios. In some cases, fields have been observed with varying degrees of maturity. In ...
  • Sugarcane Aphid Control with Falling Temperatures

    In 2014 we saw two brief time periods of less than satisfactory control with Transform on sugarcane aphids in grain sorghum across a broad geography. At the time we were mixing a ...
  • Pheromone Trap Counts, August 28. 2015

    Bollworm trap catches remained similar to last week, which is somewhat lower than average for this time of year. Tobacco budworm trap catches were somewhat higher this week. As most ...
  • Pheromone Trap Counts, August 21, 2015

    Bollworm moth trap catches were slightly higher in most counties this week but are generally lower than average counts for this time of year. Tobacco budworm moths continued to be ...
  • Defoliating Caterpillars in Peanuts

    We have had numerous calls over the last 2 weeks about caterpillars in peanut from all around the state. In every case, the calls have involved a complex of multiple species including bollworm/tobacco budworm, cutworms, armyworms, saltmarsh caterpillar, loopers, and rednecked peanut worm. ...
  • 3rd Annual Mississippi Sweetpotato Field Day Program- August 27th

    Mississippi State University will host its 3rd Annual Sweetpotato Field Day Thursday August 27 at the Pontotoc Ridge-Flatwoods Branch Experiment Station (8320 Hwy 15 S., Pontotoc, MS 38863).  Registration is ...

More Info By