Weed control in lettuce and other crops is a key issue this time of year. Purslane is particularly problematic and is adapted to warm conditions and can grow very rapidly especially during July and August. At times growers and PCAs are disappointed with the efficacy of Kerb on this weed. Kerb is effective in controlling purslane but it is readily leached and, if applied at planting, it can be moved below the zone of germinating weed seeds with the germination water. For instance, 6-8 hours of sprinkler water (1.5 to 2.0 inches) are commonly applied in the first germination water which can move the Kerb below the upper 0.5 inch of soil which is the zone where the weed seeds germinate; the movement of Kerb with the germination water is...
Weedy Rice Workshop
Thursday, August 1, 2019
10:00 AM- 12:00 noon (followed by lunch)
Colusa Casino Chairman's Room
This event is FREE, but you must register. Click HERE to register.
Limited to 50 participants, so please enroll early. Seats will be filled on a first-come basis.
Find out the in-depth updates on the latest research on weedy rice in California. This is an opportunity for growers and PCAs to ask questions and discuss the progress of managing this pest.
|9:30||Doors open, sign...|
- Author: Cheryl A. Wilen
Welcome to summer! Or at least I think it's summer since southern California is having a very strong “June Gloom” period that started before June and has touched July. You folks up north have had some pretty hot days though. That got me to thinking about solarization – the non-chemical process where soil is heated to a temperature that kills weed seeds (in this case) – by using the sun's energy.
Solarization is effective for controlling a number of different weeds species and on the surface (no pun intended), it's a pretty simple technique. Make the area smooth, wet it up, cover with clear plastic (be sure to tuck it in on the edges), and walk away for 4 weeks. It's also something that can be done...
- Author: John Miskella
- Author: Guy B Kyser
The Madsen lab is working on South American spongeplant (Limnobium laevigatum), a relatively new invader in the Sacramento-San Joaquin Delta (Photo 1). Spongeplant is a floating aquatic weed that somewhat resembles waterhyacinth and can be found alongside waterhyacinth in backwaters and along river edges. Photo 2 shows the spongy, air-filled underside of the spongeplant leaves, which allow them to float on the water surface.
Photo 3 is from a trial measuring the spread of South American spongeplant over the water surface at different water temperatures in the laboratory. This will help us to predict the timing of growth in the field, which will inform management decisions.
Photo 4 shows a spray chamber...