Matthew Fidelibus
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viticulture.bsky.social
Matthew Fidelibus
@viticulture.bsky.social
I am an Extension Specialist in the Department of Viticulture and Enology at UC Davis. I conduct applied viticulture research and extend the findings to industry. Also interested in plant science, horticulture, nature, and the environment.
Reposted by Matthew Fidelibus
Last week, the UC Davis College of Engineering band, The Technically Hip, brought some rhythm to Chancellor Gary May's faculty happy hour. They added an honorary member, May himself, because engineers know how to rock. 🎸

Meet the band: https://ow.ly/Kv1I50XylPe
November 26, 2025 at 7:25 PM
Reposted by Matthew Fidelibus
🚜 From Journal of Agricultural Safety Health: As robotics reshape farm work, researchers call for urgent study of human–machine safety, event tracking, and collaboration to protect agricultural workers. (Farzaneh Khorsandi)
▶️ pubmed.ncbi.nlm.nih.gov/40794928/
#AgEngineering #Agriculture
November 6, 2025 at 5:15 PM
Hybrid wine grape varieties bred by UC Davis to be resistant to Pierce's disease are off to a good start www.latimes.com/food/story/2...
Goodbye, Pinot Noir — hello, Paseante Noir?
Where Ojai Vineyard winemaker Adam Tolmach once grew grapes with household names, he planted hybrid varieties no consumer had ever heard of. Now he's making pioneering new wines.
www.latimes.com
November 2, 2025 at 1:15 PM
Reposted by Matthew Fidelibus
🌱 From Agricultural and Forest Meteorology: Compound and cascading climate extremes are intensifying in California’s farm valleys, shifting northward and amplifying risks to crops like almonds and grapes. (Andre Daccache)
▶️ www.sciencedirect.com/science/arti...
#PlantScience
October 23, 2025 at 7:47 PM
Reposted by Matthew Fidelibus
WOW! Our survey of scientists who stopped using Twitter and started using Bluesky is now the #1 most-shared on social media article in the history of the journal Integrative and Comparative Biology! Thanks for reading it, everyone! @sicbjournals.bsky.social

doi.org/10.1093/icb/... 🧪
Scientists no Longer Find Twitter Professionally Useful, and have Switched to Bluesky
Synopsis. Social media has become widely used by the scientific community for a variety of professional uses, including networking and public outreach. For
doi.org
October 15, 2025 at 7:29 PM
Reposted by Matthew Fidelibus
The reduced canopy area in esca-symptomatic grapevine plants leads to lower canopy transpiration and mitigates water stress (Ninon Dell’Acqua, Gregory A Gambetta, Megan K Bartlett, et al) doi.org/10.1093/plph... #PlantScience
October 9, 2025 at 1:08 PM
Reposted by Matthew Fidelibus
The cover art on our new issue features this #OpenAccess #PlantScience paper on #grape #domestication! onlinelibrary.wiley.com/doi/10.1111/...
October 8, 2025 at 3:59 PM
Our 2-acre Sunpreme vineyard ended up filling 21.5 boxes with raisins. At most, a full box of raisins might weigh 1,000 pounds, so the vineyard probably made about 5 tons of raisins/acre, which is about 2.5 times more than a typical Thompson Seedless raisin vineyard.
October 2, 2025 at 11:57 PM
Last week our raisins were dry enough to pick but we didn't have the labor in place. Then we got nearly an inch of rain and now the raisins are wetter than they should be but with the possibility of more rain and cooler weather we decided to put what we had and finish drying
September 22, 2025 at 6:05 PM
Reposted by Matthew Fidelibus
A very unusual stretch of September weather will continue across California into next week. On Sunday, a weak stream of tropical moisture may drop some showers in far SoCal (near San Diego). But a more impressive/widespread thunderstorm outbreak will be possible Tuesday... #CAwx
September 20, 2025 at 4:25 PM
A new lab pub is now available for free download: oeno-one.eu/article/view... We found that preharvest application of plant hormones that loosen the attachment of grapes to clusters reduced destemming wounds and improved quality of destemmed red grapes but caused white grapes to brown in storage.
Effects of preharvest abscission agent application on postharvest quality of destemmed Autumn King and Sheegene-12 table grape berries | OENO One
Table grapes have high production costs partly due to laborious picking and packing practices. Mechanized harvest is not yet feasible for whole table grape clusters, but it might be suitable for “fresh cut” (destemmed) table grapes if mechanical damage could be minimized. Preharvest application of methyl jasmonate (MeJA) and 1-aminocyclopropane-1-caboxylic acid (ACC) activate the abscission zone of some grape varieties, improving harvestability and reducing harvest wounds, but effects on postharvest quality of destemmed berries are unknown. Sheegene-12 and Autumn King table grapes treated with 3 mM MeJA and 500 to 750 ppm ACC were destemmed and berry condition evaluated at harvest, and after two and four weeks of postharvest storage. Treatments improved harvestability and reduced destemming wounds of both varieties and generally improved the quality of Sheegene-12 berries at harvest, and after postharvest storage. However, treated Autumn King berries became darker, and more yellow-colored in storage, which is undesirable.
oeno-one.eu
September 19, 2025 at 7:49 PM
We only just started picking a dry-on-vine DOV raisin research trial before it started raining. DOV raisins are somewhat more resistant to rain than tray dry, but 1" of rain is predicted which is an awful lot. I wish everyone in the San Joaquin Valley with unpicked or unprotected crops the best 🤞
September 18, 2025 at 10:24 PM
Reposted by Matthew Fidelibus
New Weather West post out on potentially widespread and significant thunderstorm outbreak later this week across much of California thanks to then-former Tropical Storm Mario's remnants. I discuss caveats re: dry lightning and more within... weatherwest.com/arch... #CAwx #CAfire
Wild weather week possible in California as humid heat transitions to potential dry-to-wet thunderstorm outbreak thanks to tropical storm remnants - Weather West
Early September lightning outbreak brings many wildfires, with some damage, but lack of NorCal drought prevents worse outcome The month of September started with a bang--or, rather, the near-constant rumble of thunder from thousands of lightning strikes amid an intense thunderstorm outbreak that affected a broad portions of interior central and much of northern California.
weatherwest.com
September 16, 2025 at 2:15 AM
Reposted by Matthew Fidelibus
Carbon dioxide (CO₂) averaged about 425 ppm in August 2025

10 years ago August averaged about 399 ppm

Data available at gml.noaa.gov/ccgg/trends/
September 6, 2025 at 10:58 PM
Reposted by Matthew Fidelibus
In this grower participative study on Pinot Noir, the “high yield = low quality” paradigm proved grossly oversimplified: yield reductions didn’t consistently improve ripeness or quality.🍇🍇#viticulture #wine
buff.ly/HzoTSs4
August 29, 2025 at 4:06 PM
Grape Day is one of my core extension efforts. Here's a summary of this year's meeting: www.morningagclips.com/grape-day-sh... #viticulture #grape #ucdavis
Grape Day Shows San Joaquin Valley Growers ‘What Works in Our Area, for Our Crops’
Grape Day at the Kearney Agricultural Research and Extension Center – a time-honored learning event dating to the late 1960s.
www.morningagclips.com
August 21, 2025 at 2:03 PM
Reposted by Matthew Fidelibus
The Department of Botany and Plant Pathology at Oregon State University is Hiring!

We are searching for a Director of the Oregon State University Herbarium and applications are welcomed at the ranks of assistant, associate, or full professor.
August 20, 2025 at 10:31 PM
Reposted by Matthew Fidelibus
After an unusual summer #AtmosphericRiver brings substantial rain to portions of coastal WA and OR this week, a major heatwave will likely develop across much of the West once again 7-10 days from now--with peak intensity in desert SW but likely also affecting much of California.
August 15, 2025 at 8:40 PM
Reposted by Matthew Fidelibus
🌱 From Plant Phenomics: A new neural network method generates realistic 3D leaf point clouds, improving automated trait estimation critical for crop growth and yield analysis. (Brian N. Bailey)

▶️ www.sciencedirect.com/science/arti...
#AgTech #PlantScience
August 15, 2025 at 5:25 PM
My employees found a heart-shaped Solbrio table #grape today
July 21, 2025 at 6:34 PM
Reposted by Matthew Fidelibus
JOURNAL OF WINE ECONOMICS: Climate, weather, and collective reputation: Implications for California's wine prices and quality. By Sarah Whitnall and Julian Alston.
Free access: www.cambridge.org/core/service...
July 6, 2025 at 5:53 PM
RIP Richard Smart, "Flying Vine Doctor", and author of the influential "Sunlight Into Wine". #grapes #wine wbmonline.com.au/wine-industr...
Wine industry mourns icon Dr Richard Smart
Australian wine industry icon Dr Richard Smart – ‘The Flying Vine Doctor’ – passed away in Victoria on Wednesday after a long battle with cancer. Andrew Caillard MW described him as “a remarkable man…
wbmonline.com.au
July 5, 2025 at 1:15 AM
Remembering Mark Kliewer #viticulture mailchi.mp/ucdavis/reme...
Remembering Dr. Mark Kliewer
mailchi.mp
July 2, 2025 at 7:39 PM