- Author: Anne E Schellman
I'm excited to announce that we've partnered with Natural Resources Conservation Service and the Xerces Society to bring a class all about pollinators!
You can sign up for our event at http://ucanr.edu/pollinators/2019 It's being held Thursday, September 5, 2019 from 6:00-7:30 p.m. in Harvest Hall Rooms D&E at the Stanislaus County Agricultural Center.
Please join us for a fun evening of learning about native pollinators, the plants and habitats they prefer, and the best way to “invite” them to your landscape! Free wildflower seed packets for participants while they last.
We are asking for a voluntary payment of $2 per person to help pay speaker mileage fees.
Resources
Beyond the honey bee: Learn more about California native bees. UC Davis Arboretum and Public Garden. Taken from https://arboretum.ucdavis.edu/blog/beyond-honey-bee-learn-more-about-california-native-bees on August 21, 2019.
- Author: Anne E Schellman
Last week, someone called our helpline about a strange phenomenon happening on her backyard plants. She described the symptoms as “big, white, masses of fluffy cotton.” I asked her to email some photos our helpline address (ucmgstanislaus@ucanr.edu).
When I opened her email, I was surprised to see images of what appeared to be giant whiteflies. This pest invaded California in the early 1990's and was until recently only found in Southern California and along the coast. The Stanislaus County Agricultural Commissioner's Office confirmed that giant whiteflies are present in our County.
If you've heard of whiteflies or dealt with them in your landscape, you may wonder how giant whiteflies are different, aside from being larger. Both pests suck plant juices and weaken plants. The main difference is that giant whiteflies tend to feed together in large groups. This large population creates waxy looking deposits that create a “bearded appearance” or what the caller described as “fluffy cotton” on plants. If you look closely at the infestation, you may see the pests living on the undersides of the leaves.
If you find giant whiteflies in your landscape, there are a few things you can do. For small infestations, pull off affected leaves, place them in a sealed bag, and discard them. For larger ones, direct a strong stream of water at the undersides of the leaves to knock giant whiteflies off and kill them.
Visit the UC IPM publication Pest Notes: Giant Whitefly for more information about this pest, or call our helpline at (209) 525-6802 to speak with a UCCE Master Gardener.
- Author: Ed Perry
Although many coast redwoods (Sequoia sempervirons) appear to grow well in some parts of the San Joaquin Valley, the UCCE Master Gardeners are often contacted for help diagnosing redwoods with dead branches that seem to be dying.
It's important to remember that coast redwoods are native to the coasts of Central and Northern California. In this environment, the trees are shaded by each other and experience significant cooling from fog. They also receive moisture from fog drip and high rainfall. In their native forests, redwoods grow with large amounts of forest litter over their roots.
While coast redwood trees are susceptible to some serious diseases, they are most often injured or killed by abiotic (non living) problems. High soil salinity caused by excess sodium (alkaline soil), and toxicity caused by high concentrations of specific ions such as boron and chlorides will stunt their growth and cause their leaves to turn yellow and “burn.” They grow poorly in heavy soils that are too wet, or in dry, compacted soils with poor drainage. Coast redwoods are also susceptible to iron deficiency, especially in high pH soils. They may be injured by freezing temperatures, especially in dry soil. Because they are adapted to a cool, moist environment, they will develop brown and scorched leaves during our hot and dry summers, especially if they're not adequately watered. Drought stressed trees may then be attacked by bark beetles.
In dry or compacted soils the trees grow slowly and their trunks develop a distinct taper. Under ideal soil and moisture conditions, such as along portions of the California Coast, the trunks will be nearly the same diameter from the base of the tree to several feet high. Some brown foliage in the interior of the tree is normal. In fact, it is normal for the oldest leaves to turn yellow, then brown, and finally drop from the tree in late summer and early fall. It is also normal for short twigs to turn brown and fall. New growth at the ends of branches indicates that the branches are alive and healthy, despite some dieback of twigs and leaves.
As mentioned, coast redwoods are susceptible to some diseases. In Stanislaus County, redwoods infected by Botryosphaeria canker (Botryosphaeria dothidea), crown rot (Phytophthora sp.) and Armellaria root rot (Armillaria mellea) have been identified. However, these diseases are relatively uncommon on redwoods here. If you're trying to diagnose a redwood problem, be sure to consider soil and water-related problems first.
Redwoods are forest trees. We have cultivated them for use in non-forest landscapes as street and park trees, and as specimen trees. These conditions are not always favorable to their growth or long term establishment. They grow best with shade, cool root systems, abundant mulch, and continual moisture that is relatively salt free. If you can create some of these conditions in the landscape, redwood culture and disease management will be much less problematic.
Ed Perry is the emeritus Environmental Horticultural Advisor for University of California Cooperative Extension (UCCE) in Stanislaus County where he worked for over 30 years.
- Author: Anne E Schellman
Want to save water* in your home landscape but aren't sure how to get started? The Stanislaus UCCE Master Gardeners have a free class that can help! We will cover:
- Small irrigation changes you can make now to start saving water
- How to design a low water use landscape
- Irrigation tips
- Plants that thrive in low water landscapes
We will also answer these questions:
- Should I "break up with" (tear out) my lawn?
- What kind of water rebates are available if I do?
- How can I save water and keep my lawn?
- Are cacti and succulents the only plants I can grow to save water?
Class Details
Thursday, June 27, 2019 6:00-7:30 p.m.
Stanislaus County Agricultural Center, Harvest Hall Rooms D&E
Sign up at http://ucanr.edu/lowwater2019 or call Anne Schellman at (209) 525-6862 to reserve your space.
*Over half the water used in urban homes goes towards outdoor landscapes.
Source: Public Policy Institute of California https://www.ppic.org/publication/water-use-in-california
- Author: Anne E Schellman
The University of California Cooperative Extension (UCCE) Master Gardener Program is planning exciting courses for the public for spring, summer, and fall of 2019! Two classes are happening next month:
- April 11, Growing Herbs for Beginners
- April 29, Planting the Right Tree or Shrub for your Landscape Workshop
Summer & Fall Classes
- Pest Management in and Around the Landscape Class
- Fall Vegetable Gardening Class
- Gardening for Pollinators
- Low-Water Use Landscaping
- Vegetable Gardening for Absolute Beginners
- How to Save Vegetable Seeds
Signing up for Classes and Workshops
You can register for the Growing Herbs for Beginners Class now at http://ucanr.edu/herbs2019 or call Anne Schellman at (209) 525-6800 to reserve your space. Registration for Planting the Right Tree or Shrub for Your Landscape Workshop will cost $10 and is limited to 25 people. This post will be updated as classes are available for registration online.
Follow us on Facebook or twitter for announcements about class @ucmgstanislaus. You can also visit our Classes and Workshops page for updates. https://ucanr.edu/sites/stancountymg/Classes/
Links to Helpful Pages
Who are the UCCE Master Gardeners? https://ucanr.edu/sites/stancountymg/
How do I apply for the Program? https://ucanr.edu/sites/stancountymg/Become_a_UCCE_MG/