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Advisory: Zinc Phosphide and Grass Grown for Seed
Below-Ground Use of Zinc Phosphide

Three zinc phosphide products are currently registered for below-ground use in grass seed fields. These products may be used below ground throughout the year. Care must be taken so that the product is not spilled or otherwise placed on the ground surface. The products are:

  • Bell/ ZP Rodent Bait AG (EPA Reg. No. 12455-17), OR-050031
  • Motomco/ ZP AG Pellets (EPA Reg. No. 12455-17-3240), OR-050031
  • HACCO/Prozap Zinc Phosphide Pellets (EPA Reg. No. 61282-49), OR-050032

Above-Ground Use of Zinc Phosphide

Historically, the May start date for above-ground applications of zinc phosphide on grass grown for seed has varied, and has been based on the presence of migratory geese in the Willamette Valley. In 2011, above-ground applications of zinc phosphide on grass grown for seed will only be allowed May 8 – August 31.

The Oregon Department of Agriculture (ODA) is working with the registrants of the products listed below, and revised labels for above-ground use will be issued in the next few weeks. You must have a copy of the revised label in your possession before you make an application in 2011.

The four zinc phosphide products which have previously been available for above-ground use on grass seed fields are:

  • HACCO/ Prozap Zinc Phosphide Oat Bait, (EPA Reg. No. 61282-14), OR-990009
  • Bell/ ZP Rodent Bait AG (EPA Reg. No. 12455-17), OR-990034
  • Motomco/ ZP AG Pellets (EPA Reg. No. 12455-17-3240), OR-990034
  • HACCO/ Prozap Zinc Phosphide Pellets (EPA Reg. No. 61282-49), OR-050009

As always, obtain current labeling for the product you intend to use, and be certain that your use of the product is allowed by the label. If you have any questions please contact Rose Kachadoorian at (503) 986-4635.

SLN labels are available at: http://www.pnn.wsu.edu/pnnor.html#Section24cs