- 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...
- Author: Amber Vinchesi-Vahl
Weeds are one of the biggest challenges to organic vegetable production and can be expensive to manage since herbicides are not an option.
Though sub-surface drip irrigation is the most common method of irrigation in processing tomatoes in California, furrow irrigation is still used by some producers in Sutter County, particularly organic growers. Buried drip irrigation allows for dry bed tops which helps prevent weed germination among other benefits. Furrow irrigation is common among organic producers in Sutter County because it allows for more flexibility with crop rotation and tillage. Alternate furrows are irrigated to keep bed tops from getting too wet but still provide sufficient moisture to tomatoes. Irrigation is...