Weeds can be introduced to new areas from a variety of natural and human-influenced sources. Seed transport on vehicles or equipment can be a very important mechanism of spread.
When talking about chemical weed control, a lot of different terms are used to describe the chemicals and application techniques being used. Some are terms are pretty straight forward while others are a little more specific or specialized.
How many times do we see some plant that looks unusual, we let it sit for a while, pondering its existence (maybe that's just me), and then realize its some plant we have never seen before?
The Weed Science Society of America (WSSA) recently released a series of free online training modules on understanding and managing herbicide resistance. The target audience for the five modules is consultants/field advisors/agronomists but I think any weed managers could benefit from them.
