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...
- Author: Brad Hanson
A quick post to share a link to the most recent version of the CWSS Research Update and News from the California Weed Science Society.
Lots of good information about the upcoming conference, weed science student scholarships, and weed management reports compiled by CWSS Board Member and Editor, Whitney Brim-DeForest. Including:
- Student Scholarships
- Alex Ceseski (UC Davis)
- Patrick Dotsy (Cal Poly San Luis Obispo)
- Liberty Galvin (UC Davis)
- Steven Haring (UC Davis)
- Mikayla Harmer (CSU Chico)
- Haejun Kim (Mt. San Antonio...
This article was originally prepared for the CWSS Research Update and News (December 2019 edition). You can see it and several other articles at the CWSS website. You can also get information on the annual California Weed Science Society Conference which will be held in Monterey during January 22-24, 2020.
Performance of Pendimethalin...