A quick post to share a really interesting website created by the USGS National National Water-Quality Assessment (NAWQA) Program. This site creates pesticide use maps showing geographic distribution of estimated (or actual use in California) of several dozen pesticides on agricultural lands for major crops.
The website introduction states:
The pesticide-use maps provided on this web site show the geographic distribution of estimated use on agricultural land in the conterminous United States for numerous...
Today's post is a) long, b) recycled from another use, c) of high interest due to current weather conditions, or d) all of the above? The correct answer, I think, is "D" all of the above.
As an aside, the length of this post reminds me of one of my favorite Mark Twain quotes " I didn't have time to write a short letter, so I wrote a long one instead" - there's a lot of truth in that.
Ok, this is actually an article I prepared for the meeting booklet for the Plant...
It's that time of the year when we're planning preemergence (aka "residual") herbicide programs for orchard and vineyard crops in California. Typically, these are the herbicides that are applied in the fall, winter, or early spring BEFORE weeds emerge (preemergence) and they usually affect weeds as they germinate or are just beginning to emerge from the soil. [often, people mistakenly think these herbicides kill seeds or sterilize the soil which is not actually the case].
As you're planning the specific program for the weed problems in your orchards and vineyards (or any site, really), I thought it would be a good time to review some of the...
I was forwarded this great article written by Barry Tickes, an Area Agricultural Agent with the Yuma Ag Center and part of the University of Arizona and Arizona Agricultural Experiment Station.
Today, I thought I'd share a set of photos from a herbicide symptomology demonstration that I conducted in fall 2013 for our UC Weed Science School (next scheduled for fall 2015) and more recently in spring 2014 for a training session with other UC Cooperative Extension personnel.
For those of you that work regularly with herbicides of different modes of action this may be old-hat. However, many of us who get questions about herbicide injury in the field don't get always get to see comparisons under controlled conditions.
A few definitions, caveats, and brief explanations of the attached slides:
- MOA = Mode of Action...