Author Archives: Brad Hanson

About Brad Hanson

Brad Hanson is a University of California Cooperative Extension Specialist at UC Davis. His statewide weed science research and extension program focuses on weed management, herbicide resistance, and crop safety issues.

Goosegrasses in nut orchards

Cross-post from UCWeedScience In the past couple of years, I’ve gotten a lot of questions about goosegrass in orchard production systems, particularly about suspected glyphosate-resistant biotypes. From a California orchard standpoint, we have two main goosegrasses (Eleusine spp) to deal with; these are goosegrass (Eleusine indica) and threespike goosegrass (Eleusine tristachya).  These species are fairly […]

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Performance of Alion and Matrix combinations in 2013 trials

Repost from UCWeedScience blog One of the major research and extension areas in my program is weed control efficacy in orchards and vineyards.  During the 2012-13 growing season, we conducted about 50 herbicide efficacy trials in commercial orchards or research station sites.  Today I thought I’d share some data from 2012-13 orchard weed control efficacy […]

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Rely 280 herbicide scarce for California almond market in the coming year – plan ahead

Over the past few years, herbicides with the active ingredient glufosinate (Rely, Rely 200, Rely 280) have become very important in California almonds as well as other tree nuts and grape vineyards. Glufosinate is classified as a “Group 10, or Group B” herbicide an inhibits an enzyme important in the production of the amino acids […]

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Glyphosate-Resistant Weeds in Orchards – Recent UC IPM Publications

Last winter, I particpated in a series of seven half-day workshops in California, Oregon, and Washington on herbicide-resistant weeds.  These workshops were organized by Kassim Al-Khatib from the Univeristy of California Integrated Pest Management (IPM) Program and had a special focus on glyphosate-resistant weeds in tree and vine crops. In preparation for these workshops, we wrote a series […]

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