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Crop Advice & Expertise

How to collect black-grass samples for a resistance shoot test

Bayer’s Jack Hill offers advice on how to carry out a black-grass resistance shoot test, which can provide valuable information to help plan control strategies.

“With black-grass control and managing resistant populations, it’s all about knowing your enemy”, he says. “Our black-grass shoot test will give you a full breakdown of the levels of enhanced metabolism resistance, including ACCase target site resistance and ALS target site resistance.”

 Here’s how to carry out your black-grass resistance shoot test in 5 simple steps: 

  1. Contact your local Bayer CTM to sign-up for the test and to receive your testing kit. 
  2. Plan to take samples anywhere between growth stage 14 and growth stage 24. This is because the sample of black-grass is needed at the very early tillering stage.
  3. Collect eight black-grass samples from across the field in a ‘w’ formation, to ensure an even spread of black-grass across the field. Also take the time to remove the roots from the shoots and the leaves.
  4. Use the bag provided in your testing kit to hold the samples and add water to the bag.
  5. Once the samples have been sent to the labs in Frankfurt, Germany, the results are usually turned around in two weeks.