• Learn to Keep Insects Out of your Crops
  • Weeds Can Be Managed Without Chemical Pesticides
  • Learn About Pesticides in Foods
  • Link to SK Organic Resources
  • SNAP Tour of Organic Vegetable Garden
  • Learn to Manage Pests Naturally
  • Grow a Lush Garden Organically
  • Driving Near Recently Sprayed Fields Exposes People to Pesticides
  • Learn To Manage Weeds Without Chemical Pesticides
  • Learn About Colony Collapse Disorder and How to Protect Bees

Sulfonylurea herbicides

 I decided to add this page because I learnt some pesticide formulations containing sulfonylureas are still in use, including Clear for the control of Wild Parsnip in Ontario where a recent incident involved the soaking of a farmer sitting on his tractor while trying to get out of his yard. Too many individual herbicides to check for registration, I am afraid, but I am providing a list of names.

The fact that they cause total or almost total crop failures in fruit trees and strawberries was on the news in the early 1990s but now no one talks about it. It likely still occurs. You should be aware of it and so should anyone using it. 

'Sulfonylureas (UK: sulphonylurea) are a class of organic compounds used in medicine and agriculture... A large number of sulfonylureas are used as herbicides. They function by interfering with biosynthesis of the amino acids valine, isoleucine, and leucine, specifically via acetolactate synthase inhibition. Agricultural compounds in this class include amidosulfuron, azimsulfuron, bensulfuron-methyl, chlorimuron-ethyl, chlorsulfuron, ethametsulfuron-methyl, cinosulfuron, ethoxysulfuron, flazasulfuron, flupyrsulfuron-methyl-sodium, imazosulfuron, metsulfuron-methyl, nicosulfuron, oxasulfuron, primisulfuron-methyl, prosulfuron, pyrazosulfuron-ethyl, rimsulfuron, sulfometuron-methyl, sulfosulfuron, thifensulfuron-methyl, triasulfuron, tribenuron-methyl, and triflusulfuron-methyl.21'    (Wikipedia) 

Effects of Glean, A Sulfonylurea Herbicide, on the Reproductive Biology and Fruit Set in Cherry Trees (Glean's active ingrredient is CHLORSULFURON)