- 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.
Take a close look at the fallen leaves for the characteristic irregular blotches caused by this disease. Anthracnose can.../h2>
- Author: Lauren Fordyce
The UC IPM Urban & Community Program hosts monthly webinars that are free and open to the public. Join us every third Thursday from 12pm-1pm for helpful pest related information. All webinars are recorded and posted on the UC IPM YouTube channel soon after.
10/20/22: Trees for a Changing Climate
With fall finally here, now is a great time to plant trees and shrubs. However, before you head to the nursery, consider attending this webinar on Trees for a Changing Climate. On October 20, 2022, UC ANR Environmental Horticulture Advisor Janet Hartin will discuss some underutilized trees that are heat, drought, and pest resistant. Sign up...
- Author: Belinda J. Messenger-Sikes
All mistletoes infest and grow as parasites on trees and large shrubs. In some cases, the host plant can be severely damaged. But recent studies have shown that broadleaf mistletoes can shelter and feed wildlife, including birds and small mammals. So, mistletoes are both parasitic plants and bird food!
Because mistletoes can damage trees, you may decide to do something about mistletoes infesting your trees. The first step is to find out whether you're dealing with broadleaf or dwarf mistletoe. Mistletoes differ in their life cycles, the damage they cause and management methods. UC Cooperative Extension Advisors Igor Lacan (San Mateo and San Francisco Counties), Steven Swain (Marin County) and Ed Perry (Stanislaus County,...
- Author: Elaine Lander
If you're planning to get a holiday tree for your home, you may find unexpected guests have already made their home in your evergreen selection. Common holiday trees such as firs, pines, and spruces can host pests such as aphids, scales, mites, bark beetles, or even praying mantis egg cases. These pests may be present regardless of whether you select your tree from a local tree lot or go to cut your holiday tree at a nearby tree farm or forest. But...