UC Weed Science (weed control, management, ecology, and minutia)

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Photo 2: Brad Hanson, a professor of Cooperative Extension in the UC Davis Department of Plant Sciences, examines a stock of Orobanche ramosa pulled from off a tomato plant in nearby Woodland, where scientists are studying the parasitic weed. (Emily C. Dooley/UC Davis)
UC Weed Science (weed control, management, ecology, and minutia): Article

Parasitic weeds threaten tomato plants on California farms

October 9, 2023
At first glance, Orobanche ramosa looks like an interesting blossoming plant, one that could add a unique flair to flower arrangements. But it's a parasitic weed that attaches to roots, sucks out nutrients and is threatening California's $1.5 billion processing tomato industry.
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Figure 1: Italian ryegrass in wheat trials 36 days after application (Bird's Landing). Wheat rows are visible in a linear pattern in each picture. Italian ryegrass escapes can be seen in between the rows. Note that Osprey stunted many of the IR seedlings, but weeds were able to recover. Click on the image to expand.
UC Weed Science (weed control, management, ecology, and minutia): Article

Regional Italian ryegrass herbicide trials underscore the importance of IPM in weed management

October 1, 2023
Summary Review Results from this year's Italian ryegrass (IR) herbicide trials helped quantify differences in herbicide resistance among IR populations within the southern Sacramento Valley. The trial took place in Bird's Landing, CA (near Rio Vista), and was replicated farther north in Esparto, CA.
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Figure 1: Broomrape species
a: Egyptian broomrape (left) grown in bio-control greenhouse with branched broomrape (right), b: branched broomrape, c: two color morphs of small broomrape, d: ivy broomrape e: dessert broomrape
UC Weed Science (weed control, management, ecology, and minutia): Article

Broomrape Species: ecological insights and economic significance

September 28, 2023
By Brad Hanson
The Orobanchaceae family comprises 270 holoparasitic species that cannot photosynthesize. Instead, they rely entirely on the host plant roots for nutrition, and can produce great numbers of minute, dust-like seeds that last for years in the soil.
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Non-native grasses are invading vast swaths of southern California. Those grasses feed wildfire, including the recent York Fire in the Mojave Desert. Recent fires have torched more than a million of the iconic Joshua trees native to the region. (Ziarnek-Krzysztof/Wikimedia Commons)
UC Weed Science (weed control, management, ecology, and minutia): Article

Wildfires linked to invasive grasses, Valliere says

September 24, 2023
Auto emissions 'fertilize' fuel Joshua trees burning in the Mojave Desert are the victims of changing patterns of wildfire, fueled by the spread of grasses that are not native to the region, restoration ecologist Justin Valliere told media in recent interviews.
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UC Weed Science (weed control, management, ecology, and minutia): Article

EVENT :: AAIE Conference

September 22, 2023
Anil Shrestha (Weed Science Professor, with the Department of Plant Science at CA State University, Fresno) will be speaking at the Association of Applied IPM Ecologist (AAIE) Annual Conference in Visalia, CA. His talk on "Managing weeds in an IPM program. Ecology plays a big part.
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