Posts Tagged ‘acetochlor’

Update on Acetochlor Restrictions

Thursday, April 12th, 2012

Mark VanGessel, Extension Weed Specialist; mjv@udel.edu

Last week I wrote about the acetochlor restrictions. I was not aware that these restrictions had been modified and only pertain to applications within 50 feet of a well. The following restrictions do not apply for areas more than 50 feet from a well.

Within 50 feet of a well, do not apply acetochlor if the groundwater depth is within 30 feet of the surface and you have sands with less than 3% organic matter, loamy sands with less than 2% organic matter, or sandy loam with less than 1% organic matter.

Sorry about any confusion.

Reminders on Acetochlor Use Restrictions

Friday, April 10th, 2009

Mark VanGessel, Extension Weed Specialist; mjv@udel.edu

Acetochlor is a preemergence herbicide for corn that controls annual grasses and some broadleaf weeds. It is in the following products: Harness, Harness Extra, Degree, Degree Extra, Topnotch, Fultime, and Keystone. There are use restrictions that are important in our area. The restrictions pertain to groundwater quality. The restrictions are based on depth of groundwater within one month of planting and the combination of soil type and organic matter. Do not apply acetochlor if the groundwater depth is within 30 feet and you have sands with less than 3% organic matter, loamy sands with less than 2% organic matter, or sandy loam with less than 1% organic matter.

Recent Changes to Acetochlor Labels

Thursday, April 3rd, 2008

Mark VanGessel, Extension Weed Specialist; mjv@udel.edu

 Acetochlor is a preemergence herbicide for corn that controls annual grasses and some broadleaf weeds. It is in the following products: Harness, Harness Extra, Degree, Degree Extra, Topnotch, Fultime, Keystone, Surpass, TopNotch, and SureStart. These products have had the rotational restrictions modified, allowing more crops to be planted the following spring (previously only soybeans and sorghum). The label now allows for rotation to: alfalfa, clover, barley, potatoes, oats, tobacco, others.

However, the groundwater restrictions have not changed. The restrictions pertain to groundwater quality. The restrictions are based on depth of groundwater within one month of planting and the combination of soil type and organic matter. Do not apply acetochlor if the groundwater depth is within 30 feet and you have sands with less than 3% organic matter, loamy sands with less than 2% organic matter, or sandy loam with less than 1% organic matter.