Posts Tagged: weed biology

San Joaquin Valley Weed Science Days on April 2nd (KARE) and April 11 (WSREC). Join us!

There are TWO upcoming weed science extension days in the San Joaquin Valley this April. The first will be held on the 2nd of April at the Kearney Agricultural Research and Extension Center in Parlier (9240 South Riverbend Road, Parlier CA 93648) and the second will be held on...

alkali weed

A Valentine's Day Blog Post: Weeds With Pretty Names (Re-Posted)

You just KNOW that some plants are considered weeds. Their common names give them away. They sound awful. Giant hogweed (Heracleum mantegazzianum). Ripgut brome (Bromus diandrus). Devil's claw (Proboscidea lutea). Smellmelon (Cucumis melo). Itchgrass (Rottboellia cochinchinensis)....

Identifying prostrate knotweed (and how to distinguish it from spurge)

Recently I was asked to help identify prostrate knotweed (Polygonum aviculare) that was collected from an alfalfa field. Admittedly, the tough and wire-like specimen that was submitted to me at the end of autumn didn't much resemble the succulent seedlings that I have often observed emerging in...

Palmer amaranth, hand-weeding, regrowth, and seed production

A drive around parts of the San Joaquin Valley revealed some fields with Palmer amaranth (Amaranthus palmeri) rising above the crop canopy (See image below). A male Palmer amaranth in a corn field in Merced County   Palmer amaranth is a tall (growing up to 10 feet in height), dioecious...

Annual Bluegrass Emergence Pattern

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....

InkedIMG 6511 LI

InkedIMG 6508 LI

IMG 6510

IMG 6512

Read more