I was out in the field today and drove by this fallow field and did two things. First, since I'm a weed scientist, I stopped to take a photo of this weedy streak.  Second, because I know the site manager and know he hates weeds, I called to give him a hard time about "missing one".

Any guesses on what happened here?  It might help if I told you I'm facing south and this area often has a prevailing wind out of the northwest during winter and early spring.  Another clue would be the construction site to my back with minimally managed weeds.  One more clue might be the fence behind me still loaded up with Russian thistle carcasses and debris.

Here's a link to the