Right now unwanted grass infestation can be observed more frequently in the fields again. But is it a matter of resistance, or ‘just’ the consequence of unfavorable application conditions? With two small pieces of information, we give you a guide to assess the situation correctly.
- Properly assess the extent of the bad effect
Can you observe bad effects on all agricultural surfaces that were treated with the same tank mixture and at the same time? Has your weed control there been satisfactory so far? If you answered both questions with a ‘yes’, then it is likely that you are facing application problems. Resistance never occurs over a large area immediately, but rather develops from isolated smaller spots. Should the effect suddenly not be sufficient on several agricultural surfaces, resistance is probably not the reason.
- Correctly interpret the pattern of the weed hotbeds
Have a close look at the weed hotbeds As mentioned above, resistances develop at hotbeds and spread from there. The edges of these hotbeds often seem to be frayed and don’t follow a clear and obvious pattern. You can often see that hotbeds spread along the direction of tillage. So if you see a round or tubular infestation, an existing resistance may be the cause.
What can I do if I suspect a resistance?
If the resistance suspicion is confirmed, it is worth carrying out a resistance test. In their simple forms they are available inexpensively and give an overview of which alternative courses of action are still available for combating.
We offer resistance tests starting at 79 €. Additional information can be found at this LINK.