- Author: Pratap Devkota
I visited an onion field where I saw this interesting emergence pattern with annual bluegrass (Poa annua L.). Onion beds are listed in east-west orientation (as seen in pictures). We can see annual bluegrass emergence only on the south facing slopes and none on bed-tops or north facing slopes. These pictures were taken around noon, the exact time was 12:44 PM. I assume that cultural and irrigation practices are same throughout the field. The only difference I observed was north facing slopes were shaded, but the bed tops and south facing slopes had ample light. With this situation, I am wondering what could be the possible reason for annual bluegrass to emerge on the south facing slopes but not on the bed-tops and north facing...
- Author: Guy B Kyser
This is only somewhat weed-related... just an excuse to post some photos of fossil tomatillos, from the days when Africa and South America formed the single continent Gondwanaland. If you have lanceleaved groundcherry (Physalis lancifolia) or one of the other Physalis species, this is where it came from.
- Author: Lynn M. Sosnoskie
This is the abstract and a poster from a presentation that I made at the 2016 Weed Science Society of America meeting in San Juan, PR. The results were generated from one run of each of the experiments. At this time, all of the studies have been replicated, the data is being analyzed and the manuscripts are in preparation.
JUNGLERICE (ECHINOCHLOA COLONA) GROWTH AND DEVELOPMENT IN RESPONSE TO TEMPERATURE AND SHADE.
- Author: Lynn M. Sosnoskie
A recent announcement for the Twentynine Palms (CA) annual weed show got me thinking about how we (okay...I...) view unwanted plants. As a weed scientist, I spend >99% of my time thinking critically about weeds...specifically, their biology, ecology and management. The remainder of the time, I am actually enjoying them as botanical specimens worthy of admiration. In honor of the Twentynine Palms Historical Society's 75th (75th!!!!!) annual weed show (November 7 and 8, 2015), I'm providing you with something completely different...a few of my photographs highlighting weeds in their own unique glory.
Enjoy.
- Author: Lynn M. Sosnoskie
It's the 4th of July!
Time for fireworks! (Yay!) Time for picnics! (Yay!) Time for parades! (Yay!) Time for weeds! (Huh? What?)
That's right, weeds. While it is true that many problem pest plant species were imported from Europe and Asia, a lot are also home-grown. Here's just a few facts about three interesting and native species: horseweed, Palmer amaranth, and poison ivy. Happy Holidays!
Conyza canadensis (Erigeron canadensis) a.k.a horseweed, marestail
Horseweed is an annual species native to North America that can now be found in Eurasia and Australia, as well. It can be found in all of the lower 48 states and much of...