Weed Management In Cowpea

A suggested strategy is to apply glyphosate two weeks before planting. Translocation of glyphosate through the plant requires that the plant has adequate water and is actively growing. If the soil is too dry, irrigate before applying glyphosate. Tank mixing AMS (ammonium sulphate) can improve the ability of glyphosate to enter the leaf (see directions for recommended rates). Apply Treflan pre-emergent herbicide (see label) and incorporate using a disc. Cultivate lightly about four weeks after planting. This should control weeds adequately for early-maturing (60-day) varieties and may allow time for late maturing varieties to establish a dense enough canopy to outcompete weeds given an adequate planting density.

The following have been reported to be safe for use on cowpeas although no guarantee or endorsement is stated or implied.

Preplant

  • Carfentrazone (Aim) - burndown of broadleaves.
  • EPTC (Eptam 10G, Eptam 7E) - control germinating annuals and perennial weeds
  • Glyphosate (Roundup, Durango, Touchdown, Glyphomax) - burndown
  • Imazethapyr (Pursuit) - controls broadleaves
  • S-Metolachlor (Dual Magnum) - controls most annual grasses and some broadleaves
  • Pedimethalin (Prowl) - control grasses, lambsquarter, purslane
  • Pelargonic Acid (Scythe) - burndown everything
  • Trifluralin (Treflan EC, Treflan TR-10, Trilin) - controls germinating annuals, esp. grasses

Preemergence

  • Clomozone (Command 3ME) - suppression of annual grasses
  • Glyphosate (Roundup, Durango, Touchdown, Glyphomax) - burndown
  • Imazethapyr (Pursuit) - controls broadleaves
  • S-Metolachlor (Dual Magnum) - controls most annual grasses and some broadleaves

Early postemergence

  • Bentazon (Basagran) - Only controls broadleaves.

Postemergence

  • Clethodim (Select Max) - annual and perennial grasses
  • Quizolofop (Assure II, Targa) - control emerged annual and perennial grasses
  • Sethoxydim (Poast) - controls annual and perennial grasses

Harvest aid

  • Paraquat (Firestorm, Gramoxone Inteon) - kill
  • Sodium Chlorate (Defol 6) - defoliates and desiccates (do not feed to livestock)

References

  • U.S. Department of Agriculture, Cooperative Extension Service, University of Florida, IFAS, Florida A. & M. University Cooperative Extension Program, and Boards of County Commissioners Cooperating. Millie Ferrer-Chancy, Interim Dean.

-- DavidVerbree - 2011-04-04

Topic revision: r2 - 2011-08-28 - 18:49:35 - DavidVerbree
 
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