Farmers need to be choosing the herbicide they will use in their autumn weed management programs soon, said Associate Professor Roush, and it is important that they follow these latest guidelines in this brochure when they make their choice . The guidelines show the groupings of many herbicides.
Herbicides act by interfering with specific processes in plants.
This is known as the herbicide s mode of action. Herbicide products have been grouped according to their mode of action and farmers need to know a herbicide s group to make sound choices about weed management. Professor Powles said that the main reason herbicide resistance has developed is because of the repeated use of herbicides with the same mode of action. Growers must rotate their use of herbicides across mode of action groups to extend the useful life of herbicides in controlling major agricultural weeds, said Professor Powles. The 2000 update includes revised strategies for rotating widely used herbicides and, in depth guidelines for the use of three widely used herbicide mode of action groups considered at risk for resistance development.