- Author: Belinda Messenger-Sikes
Have you been seeing a lot of defoliated sycamore trees recently? Sparse foliage and early leaf drop on sycamore trees might be due to anthracnose. The cool, wet spring in many parts of California provided the perfect conditions for this disease. Anthracnose is a common fungal disease sometimes called leaf, shoot, or twig blight. It can cause twisted, distorted branches in American sycamore, some varieties of London plane trees, and California sycamore trees. Sycamore anthracnose is primarily an aesthetic concern since it usually doesn't kill established trees.
Symptoms
Take a close look at the fallen leaves for the characteristic irregular blotches caused by this disease. Anthracnose can...
/h2>Subject: Control of Anthracnose on Sycamore Trees
Advice for the Home Gardener from the Help Desk of the
UC Master Gardener Program of Contra Costa County
MGCC Help Desk Response to Sprays for Control of Anthracnose on Sycamores: Thank you for contacting the UC Master Gardener Program Help Desk with your question about treating anthracnose on Sycamore trees. You have done a lot of research on this problem, so I am not sure we can tell you anything you do not already know. Sycamore, full-grown in...
- Author: Ben Faber
Come Learn About Field Identification of Invasive Shot Hole Borers
We're holding two early December trainings on invasive polyphagous and Kuroshio shot hole borer biology, identification, surveillance, and management of infested trees and downed wood. We'll cover these topics in the classroom, then head outside to see infested trees and learn how to identify signs of shot hole borer damage, set up a monitoring program, and sample...
- Author: Ben Faber
Los Angeles County Spring 2018 ISHB/GSOB Field Trainings
Registration now open
Learn how to recognize the signs of invasive shot hole borer and gold spotted oak borer infestations in native and landscape trees. Each training will cover how to recognize signs, symptoms, active and inactive populations, take field samples, treatment options, proper handling and disposal of green waste.
- Huntington Gardens, Tuesday May 8, 10:30 - 12:30
training entrance: 1800 Orlando Avenue, San Marino CA 91108
2) O'Melveny Park, Thursday May 17, 10:00 - 12:00
17300 Sesnon Blvd, Granada Hills CA 91344
The events are free, but registration is limited. To...
- Author: Ben Faber
Ambrosia beetles comprise a group of over 6,000 species in the Scolytinae subfamily. Most of these beetles typically attack decomposing and dead trees. The Polyphagous/Kuroshio Shot Borers have been reports on over 300 landscape and wildland living tree species, including avocado. Decline and death of trees has been noted in California since 2012, and the full economic extent is still unclear. The beetles feeds on a fungal symbiont that is introduced into the tree, and it is the fungus that spreads throughout the tree and causes the tree decline and death.
What was once thought to be another species of beetle (Tea Shot Hole Borer) and then identified as a new species - Polyphagous Shot Hole Borer- and now expanded to include...