Tree, Shrub & Lawn Care
If you have trees or shrubs you are concerned about, you can call our office to have a free on-site evaluation. Our technicians are experienced in insect and disease diagnosis, pruning advice, and treatment methods. Please call us for a free, no-obligation site evaluation of your property.
Powdery Mildew Control
I Have A White, Powder-like Substance On The Leaves Of My Plants; What Is This?
It sounds like powdery mildew, a fungus that is a frequent problem for plants in the Pacific Northwest. There are numerous strains of powdery mildew and they can be on fruit trees as well as a variety of ornamentals. If the disease is severe, foliage becomes stunted, curled, distorted and will fall off.
What Can I Do To Avoid Powdery Mildew?
To help prevent or lessen this disease you should prune and thin your plants for better air and light circulation. Remove diseased leaves and clean up fallen leaves and destroy them; do not compost them. Also avoid watering plants from above.
Many plants require regular treatments to prevent powdery mildew. If you would like more information on how we can help, please give us a call.
When I Cut Open My Apples I Find Brown Lines Throughout The Apple. What Cause This?
These symptoms are typical of apple maggot which is becoming a serious pest of “backyard” apples here in the Pacific Northwest. Apple maggot was first detected in Portland, Oregon in 1979. It is an insect native to eastern North America where it used to feed on hawthorn fruit until European colonists Introduced the domestic apple tree to North America. It has since spread to many varieties of apples.
When And How Does The Maggot Infest The Apple?
Adult flies start emerging from the soil in June and begin infesting fruit soon after. Newly emerged adults go into the canopy of the tree to feed on honeydew and other sweet substances. Seven to ten days after emerging the flies mate and the adult female fly makes a small puncture wound in the fruit and inserts an egg just below the skin. This damage is often overlooked, but leads to the fruit dimpling around the wound. The eggs hatch in 2 to 10 days and the larvae tunnel through the apple meat leaving brown streaks. This is only visible when the apple is cut open and can ruin the taste and appearance of the fruit.If tunnels are extensive the fruit may be too damaged to use at all. Once the larva matures, usually in 20-30 days, it then leaves the fruit, drops to the ground where it pupates and over-winters in the soil.
What Can Be Done To Prevent Apple Maggots?
Control of this pest is difficult. One possible treatment is a clay based protectant called “Surround at Home” that can be effective. It is not an insecticide; it works as a barrier film that irritates flies and disguises the host, discouraging egg laying. It should be applied in late June and reapplied every 7 to 14 days, or more if it rains. Be sure to read the label and follow directions.
Can Whitworth Treat Our Trees?
Yes, we can tailor a treatment program for you that will help reduce infestation.
I Have Brown Spots On My Apples And Leaves. What Is This?
It sounds like scab, which is a fungus including many species that can attack apple, crabapple, and pear trees. This disease infects developing leaves and if severe it can transfer to the fruit. Fruit that develops scab is unsightly, but the scab is usually only on the skin. Once cut away, the fruit is still edible.
How Do I Control Scab?
Control of scab requires regular preventative treatments with fungicides as the leaves are developing in the early spring and spring. Pruning to permit good air flow and avoiding overhead watering also helps to prevent scab.
If you would more information on would like to know how we can help you control scab, give us a call.
What Are Root Weevils And What Do They Do?
Root weevils are one of the most common insect pests in most landscapes. They attack rhododendrons, azaleas, viburnum, laurel, photinia, and virtually any other plant. The adults typically notch the margin of leaves while the larvae eat the roots. The adult damage is unsightly, but the larval destruction of the roots may be lethal to the plant. Once leaves on plants like rhododendrons are notched, they are unsightly until the plant sheds them.
Why Are Root Weevils So Difficult To Control?
Most pesticides will not kill root weevils. Root weevils are widespread in “wild” or greenbelt areas where they feed on salal or Oregon grape. They readily migrate from these areas to your planted landscape.They do most of their damage from early April through October, and primarily damage newly emerged, young, tender leaves. The WSU extension service recommends monthly treatments during this period, if the problem is serious.
What Can I Do To Control Root Weevils?
Plant rhododendrons that are resistant to root weevils. The WSU extension service has a bulletin that lists resistant varieties. Keep the ground under susceptible plants free of leaves and debris to reduce adult hiding places. You can also discourage root weevils from attacking your plants by removing branches which touch the ground.If your trees and shrubs are regularly treated by us, we treat for root weevils on a regular basis during warmer months. If you have plants with serious problems, you may want to do additional treatments between our visits.
If your trees and shrubs aren’t regularly treated by us, call us for an evaluation and estimate to treat your landscape.