- Author: Belinda J. Messenger-Sikes
The best way to avoid exposure to poison oak is knowing how to identify it. While the classic adage “leaves of three, let them be” can help differentiate poison oak from true oaks, it's not always correct. Poison oak is also deciduous so detecting it in the winter or spring when there are no leaves can be tricky.
More information on about this plant can be found in the recently updated
Weeds are usually thought of as native plants we don't want in areas such as landscapes, fields, or vegetable gardens either because they reduce economic output or they are considered aesthetically displeasing. Invasive plants are generally non-natives that infest natural ecosystems and can become problems.
There are four distinctions between a weed and an invasive plant. The first is how they are introduced to an area. Weedy plants in gardens, landscapes, or in agricultural fields are usually accidentally introduced. While that is sometimes true for invasive plants, they are more often intentionally introduced as ornamental plants, for aquarium use, or for food or fiber...
- Author: Karey Windbiel-Rojas
[Originally published in the Winter 2019 issue of the Green Bulletin]
What is UC IPM?
UC IPM is a statewide program within the University of California Division of Agriculture and Natural Resources. We are dedicated to helping all Californians manage pests around the home, in the landscape, on the farm, in schools, and even on the pet. Our philosophy focuses on long-term prevention of pests or their damage through using a combination of techniques such as building out pests, modifying maintenance practices, excluding pests, using.../h2>/span>
This summer, you may have noticed what looks like a large dandelion plant covered in blisters growing in your lawn or landscape. It's known as bristly oxtongue, and if you examine or touch it you'll see and feel why. The stems and flower bracts are bristly, and the leaves are covered with blisterlike swellings that are prickly to the touch.
Bristly oxtongue can be an annual weed or a biennial weed. It thrives during the winter and warm weather and can grow to be over 3 feet tall. This weed spreads by seed, which can be dispersed long distances by the wind.
According to the book, Pests of the Garden and Small Farm, you can control bristly...
- Author: Cheryl A. Wilen
I recently attended a Santa Ana River Orange County Weed Management Area (SAROCWMA) meeting and there was an opportunity for participants to update the group about new invasive plants as well as give an update on management of these and others. During the discussion, Ron Vanderhoff from the Orange County Native Plant Society (OC-CNPS), reported new findings of a plant I'd never heard of. In fact, when the group was talking about it, I wasn't sure if I heard the name right.
The plant is called stinknet (Oncosiphon piluliferum), which to me sounds like a game played by 10 year olds. However, the California Invasive Plant Council considers it an emerging invasive weed...