The 'Group' letters/numbers that you see throughout this web site refer to the classification of herbicides by their site of action. To see a full list of herbicides and HRAC herbicide classifications click here.
QUIK STATS (last updated Mar 08, 2017 )
NOTES ABOUT THIS BIOTYPE
Apera spica-venti L. (common wind-grass / loose silky-bent) with ALS inhibitor Resistance in Latvia
Apera spica-venti L. is a monocotyledonous weed species, widespread in the entire territory of Latvia, mostly occurs in winter cereals. ALS inhibitors (B group according to HRAC classification) are the most commonly applied herbicides in Latvia, often B group herbicides are applied repeatedly (repeatedly in two years in 40% fields surveyed in the time period 2013-2015). Seed samples were collected in two locations in 2015. Resistance was tested in a greenhouse trial in one case and in a molecular test for TSR-related mutations in the other case. Greenhouse trial showed reduced efficacy (75-80%) of the full recommended dose of iodosulfuron-methyl-sodium. In the field where resistance was confirmed ALS inhibitors were applied in 4 years in the time period from 2011 to 2015.
CONTRIBUTING WEED SCIENTISTS