“I hate crabgrass!” is a common lament I've heard from residents during my 35 years in UC Weed Science. However, four out of five times, the weed people are actually referring to is not crabgrass, but bermudagrass or dallisgrass. So why does knowing the name of the weed matter? It...
There are a limited number of herbicides registered for melon production in California and Arizona, two of the major production areas for cantaloupes and honeydews. Shallow cultivation and nonselective herbicides with no soil activity can be effective if used after bed formation and before planting. Both contact (paraquat [Gramoxone]) and systemic (glyphosate [Roundup]) herbicides can be used. Curbit (ethafluralin) can be effective, but should be used with caution, as crop injury will occur if it is concentrated around the germinating melon seed by water or cultivation.
While used mainly for post emergence nutsedge control, halosulfuron (Sandea) is currently registered on melons for both pre and post emergence broadleaf weed...
A recent call about the poor control of marestail (horseweed, Conyza canadensis) to glyphosate (Roundup®) wasn't surprising, but that paraquat didnt do the trick was. It turns out that there is multiple resistance to the materials. If horseweed is resistant to glyphosate it is possibly going to be resistant to paraguat which also means that hairy fleabane which has glyphosate resistance could also show resistance to paraquat. A recent study reports on the increased Conyza resistance to paraquat (Distribution of Conyza sp. in Orchards of California and Response to Glyphosate and Paraquat, Moretti et al,
- Posted by: Gale Perez
Be sure to check out the following articles in the Good Fruit Grower magazine (April 24, 2018)
Herbicide resistance pushes California grape growers to try bringing back weed control strategies such as sheep and cultivation -- UC Cooperative Extension Weed Science Advisor John Roncoroni quoted in article
- Posted by:: Gale Perez
From the California Ag Today website on March 21, 2018
Caparol Label Change Sought To Reduce Plant-Back Restrictions Following Cilantro
By Patrick Cavanaugh, Editor, California Ag Today
Cilantro production is important in California and more growers are planting it. However,.../span>