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...
From the TOPICS IN SUBTROPICS blog (Jan. 10, 2020)
Proper weed management is important for several reason, but in general younger orchards are much more susceptible to the negative impacts of weed overgrowth. The full canopies of mature orchards limit the amount of sunlight reaching the orchard floor, which suppresses the growth of many weed species. Younger trees also have less extensive rooting systems, putting them into direct competition with weeds for water and nutrients. The presence of weeds provides habitat for.../h3>
For the past several years, California rice has been dealing with a pesky new weed, weedy rice aka “red” rice. Weedy rice is a difficult pest to manage, because it is the same species as rice (both are Oryza sativa L.), rendering herbicide use next-to-impossible. In the southern US rice-growing region (Texas, Louisiana, Mississippi, Missouri, Arkansas), they utilize two rice varieties (in rotation) that have been conventionally bred to tolerate the use of two herbicides: Clearfield (imazamox) and Provisia (quizalofop). Since weedy rice is susceptible to these chemicals, the entire field can be sprayed with these herbicides: the rice varieties survive, and the weedy rice is controlled. In California, these varieties...
- Posted by: Gale Perez
Principal Weed Scientist
IR-4 Project, North Carolina State University
Closing date: 1/21/2020
For more information, visit https://jobs.ncsu.edu/postings/127846
PRIMARY FUNCTION OF ORGANIZATIONAL UNIT
The IR-4 Project is a national Federal/State partnership research program to assist farmers of fruits, vegetables, nuts, herbs, ornamentals, and other specialty crops by facilitating registration of safe and effective chemical and bio-based pest management products. The IR-4 Project is needed because the crop protection industry focuses their research efforts on major crops such as corn,...
- 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...