Monday, March 7, 2016

Whitney Cranshaw Comes to Yuma

For our Tri-State Horticulture Symposium,  on April 5, Whitney Cranshaw our Colorado State University Extension Entomology Specialist is talking on Bugs, Bugs and More Bugs.  He is also planning on doing a one hour focus on other pollinators in our gardens which keep our gardens ecosystems balanced. 

Whitney will answer any questions on insects.  But for hot topics, he plans to talk about grubs, spider mites and aphids.  Three relentless pests that plague our gardens. 

April 4th, don't miss Invasive Weeds, by Brian Talamantes, CSU Weed Science and Agronomy Agent.  He is talking on the plants which escaped from our gardens and into the wild. 

Then to enhance Whitney's hour on other garden pollinators, Dori Seamans, NRCS and Beekeeper, and Shannon Bowling, Farm Bill Wildlife Biologist will focus on Habitats for Pollinators including habitats for bees.

Meet the Vendors over lunch.  Local vendors have been invited to display their plant materials and show off their business. 

Lastly, Best Practices for Caring for our Trees, by Boyd Lebeda, CSU Forest Service will talk on the does and don'ts to caring for our trees.  Our prized resources.

Don't miss the deadline March 28, 2016.  Get registered now to be able to be guaranteed a lunch included in the cost which is $30 for one day/individual or $45/person covers both days.  Late fee is $50 at the door. 

European Elm Scale

The small oval white "dots" on the bark are scale.  In fact they are white cocoons from which the males will emerge and begin to mate with the females.  The time is near for mating in late April and May.  They are fuzzy or hairy.  These are called European Elm Scale.  They are found on elm trees throughout the United States. 
Trees exhibit symptoms of premature leaf yellowing and leaf drop.  Heavy infestations weaken branches.  Other problems are honeydew production.  The female populations can be heaviest in late June and early July.  The eggs hatch within the female's body, and the crawlers emerge over several weeks.  The nymphs will crawl onto the underside of leaves and position themselves by main veins.
Be sure to watch for the premature leaf yellowing and leaf drop in July and early August.  This could be among the possibilities.

Freeze and Borer Damage on Hackberry Trees

Photo Credit: Donna Davis, CSU Forest Service
This is damage done by woodborers and quite possibly freeze damage. Most of the time we think that the damage was done by a squirrel who ripped the bark away. In this case with the trunk riddled with holes, Red-headed Ash borers and/or Flatheaded Appletree borers are responsible along with freeze damage.  These are two common borers for our area that would be attracted to Hackberry trees. There are visible cracks in the trunk and no active tissue for the bark to stay connected to the tree.  These cracks are a sign of the freeze damage not always visible on the outer surface of the bark.

Photo Credit: Donna Davis, CSU Forest Service