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Working closely with the University of Florida School of Forest Resources and Conservation and The University of Georgia Warnell School of Forestry and Natural Resources IFCO has been able to provide you with information concerning the use of Imazapyr for chemical site preparation in the southern pine establishments.

We hope you will find this information informative and as always if you have questions please call us at 800-633-4506 or email us.

Imazapyr Site Prep

Timeline for Herbicide Site Prep Treatment

Table 1: 2 lb. acid equivalent:

PLANTING DATEHERBICIDE SITE PREP TREATMENT DATE**
May-JuneJuly-AugustSeptemberOctober
Herbicide product rates per acre*
Loblolly Pine
October48 oz.40 oz.NONO
November52 oz.44 oz.40 oz.36 oz. (NO)***
Dec-Jan56 oz.48 oz.44 oz.40 oz.
Feb-Mar64 oz.56 oz.52 oz.48 oz.
Longleaf and Slash Pine
October44 oz.36 oz.NONO
November48 oz.40 oz.36 oz.(32 oz.) NO***
Dec-Jan52 oz.44 oz.40 oz.36 oz.
Feb-Mar60 oz.52 oz.48 oz.44 oz.
*Imazapyr product formulations containing 2 lb. acid equivalent imazapyr per gallon such as: trade names (manufacturer):  Chopper, Chopper Gen2 (BASF Specialty Products), Polaris SP (NuFarm), and Rotary 2SL (Alligare LLC). 
 
 
 
**Do not plant within 60 days of a 48 oz/acre or greater (2 lbs. ae/gallon) imazapyr herbicide application.
***Do not plant within 45 days of a 32 or 36 oz/ac imazapyr rate when rainfall amounts for the area are lower than normal, soil moisture is not adequate for planting, and competing vegetation is less than 1 foot tall.

Table 2: 4 lb. acid equivalent:

PLANTING DATEHERBICIDE SITE PREP TREATMENT DATE**
May-JuneJuly-AugustSeptemberOctober
Herbicide product rates per acre*
Loblolly Pine
October24 oz.20 oz.NONO
November26 oz.22 oz.20 oz.18 oz. (NO)**
Dec-Jan28 oz.24 oz.22 oz.20 oz.
Feb-Mar32 oz.28 oz.26 oz.24 oz.
Longleaf and Slash Pine
October22 oz.18 oz.NONO
November24 oz.20 oz.18 oz.(16 oz.) NO**
Dec-Jan26 oz.22 oz.20 oz.18 oz.
Feb-Mar30 oz.26 oz.24 oz.22 oz.
*Imazapyr product formulations containing 4 lb. acid equivalent imazapyr per gallon: trade names (manufacturer): Arsenal AC (BASF Specialty Products), Polaris AC Complete (NuFarm), and Imazapyr 4SL (Alligare LLC). 
 
 
**Do not plant within 60 days of a 24 oz/acre or greater (4 lbs. ae/gallon) imazapyr herbicide application. 
 
***Do not plant within 45 days of a 16 or 18 oz/ac imazapyr rate when rainfall amounts for the area are lower than normal, soil moistrue is not adequate for planting, and competing vegetation is less than 1 foot tall.
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