Weeds in young orchards compete with trees for orchard resources such as sunlight, water and nutrients. This can lead to reductions in growth and future yields. If weed stands are allowed to mature, not only are they harder to control via chemical and mechanical methods, but they can also create cover for voles and gophers which can then damage tree trunks, root systems and irrigation systems.
Weed management can be particularly difficult in newly planted and young orchards because rapid weed growth is accelerated by frequent irrigation necessary to establish trees, fertilizer inputs to grow the trees, and the abundant sunshine due to small tree size. In addition, control is challenging because tree trunks may still be green and...
- Author: Travis M Bean
New research published in PNAS (Fusco et al 2019) highlights the role of invasive grasses in creating new wildfire regimes at not just local but regional scales. Weed scientists are familiar with the concept of the grass-fire cycle (D'Antonio and Vitousek 1992): exotic grass invasions promote hotter or more frequent fires, which in turn facilitates more extensive grass invasion, causing more fires, etc. Perhaps now is the right time to better educate non-scientists about this critical concept as wildfires take up more of the public's...
Last summer, I transplanted a tomato variety trial into a field not far from Dos Palos, an area where annual crops such as cotton, corn, tomatoes, and melons have historically dominated the agricultural landscape. The soils in this area typically are clay loams with elevated pH (> 7) as well as salinity (EC > 2). In particular, the soil at this specific location was classified as an Alros clay loam with a pH of 8 and an EC of 3.2. And this was the good part of the field!
The trial was long enough that it extended across the entire length of the field. At the south end, it terminated in an obvious alkali spot: the soil was much lighter, and the structure was that of powdered chalk. I briefly considered moving the remaining...
Why scout for weeds?
While weeds are present in every orchard, there is variation in the weed species composition and density from orchard to orchard. Scouting for weeds is the basis for a good Integrated Weed Management (IWM) plan. Information gathered from weed scouting allows growers to:
- Evaluate the current year's weed control program
- Adjust control practices for the following year
- Discover weed stands and possible resistance before they spread throughout the orchard
- Select the best control option for species of concern, such as:
- Choosing appropriate management...
- Posted by: Gale Perez
From the Western IPM Center November 2019 newsletter...
Looking for Answers as Kochia Rolls Across the West
Kochia is a tumbling weed plaguing growers and ranchers from Central Canada to West Texas.
“It's salt tolerant, heat tolerant, cold tolerant,” said Kent Davis, a crop consultant with Crop Quest in Colorado. “I want to kill the damn stuff, there's no question about it, but you have to admire it at the same time.”
Davis spoke at a recent.../h3>