What is Armillaria Root Rot?
Armillaria root rot is a severe fungal disease that affects trees, woody plants, and some herbaceous plants including palms and succulents.
Also known as oak root fungus, Armillaria root rot can rapidly kill trees and presents a challenge to management since infected woody roots can persist for years underground. No plants are completely immune to Armillaria root rot, so prevention is key. Deeply planted trees are often more susceptible to this disease.
The distinctive “honey mushrooms” growing from the base of a tree signals an infection, but they may not always be present. Other visible symptoms include flat cankers on the trunk, wilting, and canopy...
/h2>- Author: Elaine Lander
Mistletoe is a familiar sight of the season, often found wrapped in ribbon and hung for certain festivities this time of year. But did you know it is actually a parasitic plant that grows on a number of landscape trees in California?
There are two types of mistletoe in California. Broadleaf mistletoes attack certain broadleaf trees and some conifers while dwarf mistletoes attacks only conifers. Broadleaf mistletoes have green stems with thick, oval leaves. Dwarf mistletoes are smaller, with short stems and yellow scaly leaves.
Both types of mistletoe grow through tree bark and into the tree's tissue, living off the host tree. Healthy trees can typically tolerate a few mistletoe infections although individual branches may...
Days are getting shorter and evenings cooler as winter approaches. Sweater weather also means a change in the to-do list around the yard.
Here are a few things to consider when preparing your landscapes and gardens for winter.
Frost
- Protect sensitive plants from cold injury when freezing or frost is predicted. Cover plants with cloth or a similar material at night, leaving the covers open at the bottom so heat from soil can help warm plants.
- When frost or freezing is expected, irrigate dry topsoil at least 3 days before the cold weather to increase the soil's ability to retain...
The sight of deer in the wild can be delightful but when these animals invade your garden, devouring everything in sight, people's ideas might change. The internet is full of advice for ridding your garden of deer, but beware, much of it is ineffective.
In the newly revised Pest Notes: Deer, author and retired Wildlife Specialist Robert Timm, shares detailed deer management methods proven by UC research to be effective. Pest management works best when you understand the pest's biology and behavior, so new information about the range of the different deer...
Weeds in the landscape can be tough to manage. But there are many options for weed management using an integrated approach that combines nonchemical and chemical methods.
Identification:
- Start by identifying the weeds you want to manage. UC IPM has a weed photo gallery that includes most weeds found in California landscapes. Knowing how a weed grows and spreads is an important step in successful control.
- Once you know what weed or weeds you're dealing with, consult the Pest Notes series on weeds to find specific management options.
- Management...