Pre-harvest Herbicide - Parrish and Heimbecker, Limited

Simplify your harvest

control perennial weeds

Find the right product to simplify your harvest this year

There are a number of factors to consider to make your harvest easier, and to ensure your crop is marketable. P&H can walk you through these decisions and help you select the right strategy for your farm.

The benefits of pre-harvest.

There are two primary reasons to apply a pre-harvest herbicide. The first is for weed control. Hard-to-control perennials such as Canada Thistle and Quackgrass are best controlled during the fall when leaf area is at is maximum. This is the primary reason pre-harvest should be considered in crops such as cereals with crop staging being critical. For wheat, preharvest application can only occur when the crop is at 30% or less moisture content. At this stage, if you press the kernel with your nail it will leave a dent in it.

The second reason to apply pre-harvest herbicide is for crop dry down. Certain pre-harvest products like diquat and HeatLQ will help dry out the plant and accelerate the overall maturity and harvesting process. It can also help mitigate uneven crop growth and control weeds. It’s important to note that glyphosate is not to be used for desiccating purposes. Not only is it ineffective, (takes over two weeks to dry down) but it gets absorbed by an immature crop which leads to residues in the grain.

Where are pre-harvest products allowed?

  Glyphosate Heat LQ Diquat
Canola Yes Yes Yes
Wheat Yes Yes No
Barley Yes Malt – Consult with
grain company
Feed – Yes
Oats Consult with
grain company
No No
Peas Yes Yes Yes
Soybeans Yes Yes Yes
Chickpeas Yes
(WeatherMax, Transorb)
Yes Yes
Potatoes No No Yes
Flax Yes Yes Yes
Lentils Yes Yes
(Red lentils only)
Fababeans Yes No Yes
Dry bean Yes Yes Yes
Cereal Seed Crops No No No

Talk to your Grain Buyer

When considering pre-harvest products like glyphosate, heat or diquat, it is important to pinpoint what exactly you are trying to accomplish, and in which crops. It is very important to check the declarations of grain buyers to see if they will accept grain treated with certain products. P&H will work with you through these considerations and help you pick a product that will meet your operation’s needs.

For complete details on pre-harvest products by crop, visit Keep it Clean.

Our team of experts is ready to help.