26 November 1999

Blackgrass hope gfgfg

GROWERS could have a rapid resistance test for growing blackgrass next autumn, according to Harper Adams University research presented at the conference.

Samples of blackgrass at the single or two-leaf stage are tested for raised levels of plant enzyme GST. That seems to be a reliable indicator of general herbicide resistance.

"It is the high GST plants that are surviving herbicide treatment," says PhD student John Reade. Testing can be done in a day, so resistance could be identified before the three-leaf stage when herbicides have to be applied.

The research will be complete next March. &#42