Oakleaf goosefoot a new weed concern in the Salinas Valley
Richard Smith, Farm Advisor, UCCE Monterey County
Oakleaf goosefoot (Chenopodium glaucum) is a new weed to the Salinas Valley that has become more prevalent. Its population has been on the rise for several years and it has become a significant weed in some parts of the valley. It ranges in vegetable production fields from Castroville to King City. High populations are still spotty in the valley, but in some fields it is one of the principal weeds.
Oakleaf goosefoot is closely related to lambsquarters (C. album) and nettleleaf goosefoot (C. murale). A variety of oakleaf goosefoot is native to eastern California (C. glaucum var. salina). The variety that we have here in the Salinas Valley is not the native, but rather the non-native variety C. glaucum var. glauca which is widely reported as a weed in many parts of the United States.
Oakleaf goosefoot can be distinguished from the other Chenopodium species by the shape and texture of the leaves. The undersides of the leaves are white-mealy (Photo 1), while the rest of the plant is glabrous or nearly so (Photo 2). The leaves tend to be thickened and the margins of the leaves can be coarsely serrated. The plant is more prostrate than lambsquarters or nettleleaf goosefoot and that is a good way to distinguish it in the field (Photos 3-5). The stems of oakleaf goosefoot tend to be reddish.
Oakleaf goosefoot can inhabit vegetable production fields as well as the margins of fields and ditches (Photos 6-7). At this point, it appears to be susceptible to the same herbicides as the other Chenopodium species. In one trial, it was shown to be highly susceptible to the combination of Kerb and Prefar. That is the good news. The bad news is that it is spreading and is taking full advantage of opportunities along field edges to set great quantities of seed. At this point, the populations of this weed have increased to the point that several growers and PCA's have commented about it and have expressed concern for its growing populations. It is good to recognize this weed and address it as you would the other Chenopodium species.
Photo 1. Oakleaf goosefoot: above and lower leaf surfaces shown
Photo 2. Oakleaf goosefoot seedling
Photo 3. Oakleaf goosefoot showing prostrate growth form and coarsely serrated leaves.
Photo 4. Oakleaf goosefoot in comparison with lambsquarter seedling (on right).
Photo 5. Oakleaf goosefoot just below nettleleaf goosefoot seedling
Photo 6. Flush of oakleaf goosefoot seedlings and more mature plants in a ditch
Photo 7. Flush of oakleaf goosefoot growing along the edge of a ditch
Compost for a climate resilient Salinas Valley
Compost para un Valle de Salinas resiliente al clima
- Author: Larry J Bettiga
-history of sulfur use, formulations, mode of application, and role in resistance management
-air assisted sprayer settings, air induction nozzles, and using spray cards to assess coverage
-the effect of certain weather conditions on drift
-powdery mildew fungicide resistance and the importance of FRAC codes
-efficacy of various products for management of powdery mildew in vineyards
Aug 11 grape pm webinar flyer
For more information, contact Richard Smith @ 831-759-7357, email: rifsmith@ucdavis.edu
/h6>/span>21INSV and Pythium Update Meeting
Questions? Contact Cole Smith at (408) 921-9453
Email: cbrsmith@ucanr.edu
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