Resistance Management - UPL OpenAg

Weeds Resistance



Fleabane (Conyza spp) is a very common annual plant in the Southern part of Brazil. It is a species that causes major losses in yield and is easily spread by wind. Its production potential is over 200 thousand seeds per plant in one cycle.

Seeds germinate during fall/winter, developing during spring and summer, therefore, is characterized as a winter and summer weed.

Fleabane is considered very aggressive species due to its great capacity of dispersion; it is an erect plant, reaching up to 2 m tall depending on developmental conditions.

How to manage

In areas with resistance plants presence it is important to put into action some practices, including:

  • Herbicide rotation with different mechanisms of action;
  • Crop Rotation;
  • Scouting early resistant plants;
  • After herbicide application, weed out surviving plants in order to avoid production and dissemination of seeds in the area;
  • 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;

Fleabane management can be done in different opportunities, not only in pre-sowing crop desiccation. Winter is one of the best times for management, when fleabanes are small and easy to control.


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