Resistance Management - UPL OpenAg

Weeds Resistance



Sourgrass (Digitaria insularis (L.) Fedde) is a perennial grass highly adaptable to different agricultural environments. In Brazil it occurs in great intensity in Parana State, and Southeast and Central-West regions, in orchards, coffee plantations, pastures, vacant land and roadsides.

It is a plant of easy dispersion since its seeds are small and end up being loaded by wind or by agricultural machinery.

Sourgrass is a rapid growth plant, capable of producing up to 100 thousand seeds in warmer periods. When there are high infestations up to 60% of the production may be compromised.

How to manage

Controlling this weed is complex and requires the adoption of different strategies, whether chemical or not. Plants can be controlled even before germination, with use of pre-emergent herbicides. In post-emergence phase sourgrass is more sensitive to agrochemical up to 35-40 days of development when normally has about 3 to 4 leafy shoots (tillers).

Other weed control management and prevention techniques are:

  • Herbicide rotation with different mechanisms of action;
  • Crop Rotation;
  • Scouting early resistant plants;
  • Certified seed use and quality seed;
  • Performing sequential application of herbicides with different modes of action;
  • Weed Seed Bank depletion Practices and reposition avoidance;
  • Machinery and Implements Cleaning to avoid Fleabane seed dispersion;

Select One Pack Action Video

Watch the trials with Select One Pack performance on glyphosate resistant Ryegrass and Sourgrass.




UPL has in its portfolio solutions which provide support in Sourgrass management avoiding yield and quality losses in the crop. Click on the image to know more about each product.