Current Issue - Spring/Summer 2013
Show Back Issues
Phytophthora Root Rot
What do the Irish potato famine, sudden oak death and your dying rhododendron have in common?Orford Cedar hedge dying from Phytophthora
A sign of disease: reddish-brown discoloration with a sharp line separating healthy white tissue
These serious plant problems are caused by a root rot disease called Phytophthora. Our naturally wet rainy climate and heavy clay soils create ideal conditions for root rots to flourish and damage susceptible plants. While disease management is possible through a combination of cultural, organic and fungicidal treatments it is often better to replace the dead plant with a swamp plant that can tolerate the conditions or turn the area into a pond. There are many hundreds of plant species that are attacked by Phytophthora root rot — here are the facts:
Ornamental trees: cherry, dogwood, holly, madrone and oak.
Diseased plants are commonly found in heavy clay soils and poorly drained areas of the landscape. Affected plants will have reduced vigor and growth, yellowing of the leaves, then wilting, rapidly turning brown, resulting in death of the plant. Infected trees may decline slowly over a several year period or they may suddenly wilt and die rapidly after the first warm weather period. Some species of Phytophthora will attack above ground portions of plants such as branches of rhododendrons or tree trunks as in sudden oak death.
A preventative application of beneficial mycorrhizae has been demonstrated to help protect roots from Phytophthora infections.
Use of approved fungicides can help manage Phytophthora but are seldom effective in reviving plants that have advanced symptoms and are wilting. Fungicides are most effective when combined with the cultural practices described above.
This tree has outgrown it’s location — blocking the window and doorway
This tree was Crown Thinned and Crown Reduced
Two Remedies for "My Tree’s Too Big"
We often get told by clients that they have a tree that is too big and “something” such as "topping" needs to happen to solve the problem. Since topping is not an acceptable way to reduce tree size, we need to understand what the goals and objectives are behind the client’s request to reduce tree size. Topping creates ugly, hazardous and unhealthy trees. If topping does not kill a tree then it will stimulate a rapid and unwanted sucker re-growth as well as allowing decay to rot the insides of a tree. Many people want trees topped or removed because they are too big. Trees occasionally drop large branches or fall (usually because of storm conditions or poor health), but not because they are too big. If you feel your tree is unsafe, have one of our arborists do a hazard tree evaluation. If your tree has truly become too big because it is growing into your house, raising the sidewalk, blocking your view of Mt. Hood, or numerous other reasons then consider the following options:
Remove and Replace
If a tree is truly in the wrong place consider removal. We remove weeds because they are in the wrong place or tear down old buildings when they no longer contribute to property values. It is often better to remove a tree than to keep it unnaturally small by improper and repeat pruning. Plant the right tree in the right place. Replace it with trees that are genetically programmed to grow and stay smaller. Trees such as Styrax, Stewartia, dogwoods and Japanese maples are but a few examples of beautiful small trees.
Prune the Tree
Our skilled arborists can prune your trees to make many of your tree problems (and fears) magically go away. Selective pruning can reduce the bulk of your tree, allowing more sunlight to penetrate and wind to blow through a tree — making it safer. Our arborists know specific pruning cuts that will make your trees safer, less massive and they know when to quit, so as not to over prune.
We prune trees in accordance to the American National Standards Institute (ANSI) A-300 Pruning Standards. Each tree pruning estimate includes an explanation of the terminology and the different types of pruning in the standard.
The following are types of pruning that can be done to keep your trees smaller and safer:
Just because a tree is “big” does not mean it is unsafe. Trees are big by their very nature; after all they are the tallest, most massive and longest lived organisms on the planet. True tree lovers will appreciate a tree’s greatness by its size, age and species. To find out how to manage your tree, give us a call. You may find that it is just a youngster with more growing ahead. Or, it may be the biggest and best in your neighborhood — you might just want to maintain it that way.
The Plant Health Care Team: Tom Townsend, B.S., Certified Arborist; Kellee Boyer, B.S.; George Clymer; Bob May, Certified Arborist; Chris Miller, A.S. Certified Arborist; and Bruce Colman, B.S.
Meet Collier Arbor Care's
The Arbor Advisor |
Garden Calendar |
About Us |
Fact Sheets |
Contact Us |
Collier Arbor Care Portland 503-722-7267 Vancouver (360) 693-6056
Site contents and design ©2013 Collier Arbor Care