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ArborCare/ArborScape, Inc. has been serving the Wasatch Front since 1985.
Our services are tailored to the specific needs of each customer for enhancing their landscape.
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ArborCare-ArborScape Information (Utah Pest Control)
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Utah Pest Control Guide
Aphids - (This pest harms the tree or shrub)
Common Aphid
Best control is achieved through the use of soil systemic insecticides at least one month prior to infestations. Merit 75WSP is recommended as a Soil Systemic. Also sprays using chemicals such as Talstar, Astro, M-Pede, and Horticultural oils are effective.
Black Cherry Aphids
Attacks the leaves of cherry trees. Spray in early summer when fruit is small and no riper than straw colored. Spray with Dimetholate or Imidan to control this aphid.
Black, Fir Aphids
Found on Fir trees in spring on the trunk up to the tip of the tree. Commonly found on White Fir, and Sub-Alpine Fir trees. Use a soil systemic insecticide such as Merit 75WSP at least one month prior to infestation, or spray with chemicals such as Astro and Talstar when the aphids are first detected.
Giant Willow Aphids
Attacks trunk, stems, and leaves of willow trees. This aphid emerges and becomes a problem in early fall. Spray in early August with Astro. (2 Sprays, 2 weeks apart)
Wooley Aphids and Adelgids
Infestations occur throughout the season and are often found on the underside of Beech Tree leaves and on fresh cuts of Apple Trees after spring Pruning. The use of a soil systemic insecticide (Spring) Such as merit 75WSP is effective on trees that don’t produce fruit for future Harvest. Sprays that are effective include Horticultural-Oil, Astro, Talstar, and M-Pede. (Spray must cover the underside of leaves where infestations are present.)
Bark Beetles - (This pest harms the tree resulting in death)
Spruce/Pine (IPS)Bark Beetles
This pest is especially difficult to control once the insect has invaded the tree. Preventative treatments are strongly advised if and neighboring trees are under attack or if the tree in question is under Physiological stress. Bark Beetles will not normally attack healthy trees.
Preventative treatments include a late spring trunk spray with carbaryl insecticide or Permethrin(a pyrethrum). A summer spray will also help if no spray was done in the spring. Complete coverage of the trunk and inner large limbs up to the tip of the tree as well as spraying the leaf litter under the tree will help prevent infestation. The following mixing instructions for trunk sprays are suggested:
Apply 1 spray mid-April to May (while beetles are in flight).
Astro - Mix 2 Qts. Of Astro with 100 gallons of water.
Carbaryl 4L - Mix 4 gallons of Carbaryl 4L with 100 gallons of water.
(Note: This high concentration of chemical should be used with extreme caution.)
Infested trees may survive if caught early before excessive damage is done. Excessive damage may be done before tree shows major signs.
Elm Bark Beetles
Best control is achieved through the use of a soil systemic insecticide such as merit 75WSP. Pruning out deadwood and infested limbs is very critical in order to prevent the spread of disease, including Dutch Elm Disease.
Cherry Bark Beetles (Shot hole Borers)
Control Achieved through sprays. Apply 2 sprays, 1st in Late April, after blooming is finished, and once in late june after harvest. Use Sprays such as Astro or Carbaryl 4L.
Borers *Note: Borer infested trees May still die from disease introduced by the Borers. Preventative treatments are more effective than treating infested trees.
Ash/ Lilac borers
Control through the use of a soil systemic insecticide (spring) such as Merit 75WSP. This process controls new larva feeding on the cambium tissue. Sprays are also effective if timing is correct. Spray trunk and all main limbs. Use such chemicals as Astro. (2 sprays, 2 weeks apart beginning in late-May to mid-June)
Aspen/ Poplar Borers
Control through the use of a soil systemic insecticide (spring) such as Merit 75WSP. This process controls new larva feeding on the cambium tissue. (also stops aphid infestations)
Bronze Birch Borers
Control through the use of a soil systemic insecticide (spring) such as Merit 75WSP. This process controls the Borer feeding on the cambium tissue. Sprays are also effective if timing is correct. Spray trunk and all main limbs. Use such chemicals as Astro. (2 sprays, 2 weeks apart beginning in late-May to mid-June)
Locust Borers
Control through the use of a soil systemic insecticide (early fall) such as Merit 75WSP. This process controls new larva feeding on the cambium tissue. Sprays are also effective if timing is correct. Spray trunk and all main limbs. Use such chemicals as Astro. (2 sprays, 2 weeks apart beginning in early to late-august)
Peach Tree Borers
Spray trunk and all main lower limbs. Use such chemicals as Astro. (2 sprays, 2 weeks apart beginning the end of June or before July 4th) More Info
Pine Shoot Borers
Control through the use of a soil systemic insecticide (spring) such as Merit 75WSP. This controls borers feeding on the new shoot tissue.
Birch Stink Bugs - (This pest does not harm the tree)
Birch Stink Bugs feed on the seed pods of the tree and become a nuisance when populations are large. Control is achieved through sprays. (2 sprays, 6 weeks apart beginning in mid-June) Use such chemicals as Astro.
Boxelder Bugs - (This pest does not harm the tree)
Boxelder Bugs feed on the seed pods of the tree and become a nuisance when populations are large. Control is achieved through sprays. (4 sprays, 6 weeks apart beginning in mid-May) Use such chemicals as Astro, Tempo, Merit, and Orthene.
Adult Boxelder Bugs appear in early spring and late fall but are not feeding. If a spray is desired use a contact insecticide such as Astro or Tempo.
Cherry Fruit Flies - (This pest harms the fruit)
Requires one spray with Dimetholate the last week of may, or 2 sprays using Imidan 2 weeks apart beginning the last week of may. (If sprays for Apple Codling Moth are being done at the same integrate the Cherry Fruit Fly sprays with the first two Codling Moth sprays. Dimetholate does not control Codling Moths.)
Codling Moths - (This pest harms the fruit)
To achieve control follow the specific spray schedule requiring 4 sprays. The schedule is based on Codling Moth presence by Pheromone trap throughout the growing season in Kaysville, Utah.
1st Spray: Spray between May 20th – 25th (mix 1lb. Imidan with 100 gallons water and 2% Horticultural-Oil.)
2nd Spray: Spray between June 10th – 15th (mix 1lb. Imidan with 100 gallons water and 2% Horticultural-Oil.)
3rd Spray: Spray between July 5th – 10th (mix 1lb. Imidan with 100 gallons water, include spreader sticker)
4th Spray: Spray between Aug. 1st – 5th (mix 1lb. Imidan with 100 gallons water, include spreader sticker) More Info
Cooley Spruce Gall
Control is achieved while insect is in the egg stage. Use a Dormant Oil spray in late fall or spring before Bud break. Unless populations are high, this insect does not pose any threat to the tree.
Elm Leaf Beetles - (This pest harms the tree)
Control through the use of a soil systemic insecticide (spring) such as Merit 75WSP. This treatment provides season long control. Also trunk injections with Greyhound insecticide are effective for quick control during the summer. (Note: same treatment controls Scale insects)
Leaf Miners - (This pest harms the tree or shrub)
Birch Leaf Miners
Leaf Miners feed on the inner tissue of leaves. Control through the use of a soil systemic insecticide such as Merit 75WSP. (must be done in spring no later than the beginning of April) Control is also achieved through sprays with Orthene. (2 sprays, 2 weeks apart beginning the first week of May) More Info
Oakworms - (This pest defoilates the tree)
One Spray in mid-May with chemicals such as Orthene, Tempo, Mavrik, and Astro, should provide control of Oakworms. (also called cankerworms, inchworms) A Dipel, a biological insecticide is also provided for safer control. (2½ lbs. Per 100 gallons water, approximately 1½ Qts.)
Plant bugs - (This pest harms the tree)
These insects commonly a problem in sycamore and honey locust trees damage the leaves in the spring and early summer as they are developing causing a lacing appearance or curling and stunting of growth. Insect can be controlled by 1-2 sprays in the spring, or through systemic insecticide treatments. The systemic treatments also work well as a preventative.
Sawfly Larvae - (This pest harms the tree or shrub)
Sawfly larvae feed mainly on Scotch Pines and Mugo Pines. They Defoliate the tree/shrub. Control with one spray the first week of may or when Sawfly larvae are spotted. Use chemicals such as Orthene, Tempo, Mavrik, and Astro.
Scale Insects - (This pest harms the tree or shrub)
Control may be achieved through the use of a spring dormant oil spray or through the use of a spring soil systemic insecticide such as merit 75WSP. If either of the above preventative treatments are not applied 2 sprays with Orthene will also provide control. (2 sprays, 6 weeks apart beginning in mid-May. (*Dead scale insects may take 2 full years to loosen from the tree leaves or needles.)
Spider Mites - (This pest harms the tree or shrub)
Test for Spider Mites using a white paper test. If populations are moderate to high, use instructions for High Populations, otherwise use preventative measures.
Preventative measures: spray using a dormant oil in the spring to control mites at the egg stage. 3 light sprays during the summer will keep populations under control. Spray miticides (mavrik, Talstar, Floramite) using a different chemical for every spray. Do not spray insecticides, they kill predatory insects causing mite breakouts.
For High Populations: control with 3 sprays. (2 sprays, 7 days apart(use different chemical for both sprays), 1 more follow up spray 3 weeks later) Spray with Flowable Sulfer, or Horticultural-Oil 2% mixed with Talstar. Mavrik may also be used. (use horticultural oil or Sulfer only if temperature is under 90 degrees F..) Spray the underside of the leaves with a high pressure mist. Complete coverage of all leaves must be obtained to provide acceptable control when populations are high. More Info
Weevils - (This pest harms the tree or shrub)
Strawberry Root Weevils
Control Larvae and Adults by spraying the shrub and soil to the drip line. Use chemicals such as Talstar at a rate of 24 oz. (3cups) Per 100 gallons of water. (2 Sprays, 4 weeks apart beginning in June) A fall spray can also be included to provide control against the late root weevil hatch.
White Pine Weevils
commonly Known as Tip Weevils (also called conifer twig weevils), destroy the tip or main terminal of Pine and Spruce trees. This is a big problem in Park City. Spray applications must be made to the top terminal leads and upper trunk before the weevil can insert her eggs into the tip tissue of the tree. One spray the last week of April, should be made with Dimilin at a 4oz./100gal mixed with 2% Hort- Oil. A late fall soil systemic insecticide such as Merit 75WSP is another method of control. Infested tips should be pruned out of the tree. More Info
Safe Product Guide - Product / Pest Controlled
1. B.T. (bacillus thuringiensis) - canker worms, oakworms
2. Beneficial Nematodes - strawberry root weevils(price like merit)late spring
3. Green Lacewing Larvae - aphids, mites (price a little higher than merit) may-aug.
4. Horticultural Oil - aphids, spidermites, spruce gall, scale
5. Insecticidal Soap - aphids, spidermites
6. Preditory Mites - spidermites (price a little higher than merit)june-july
7. Sluggo - snails, slugs
Salt Lake City Pest Control
As of 2002
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If you have any questions or would like to speak with an ArborCare representative regarding your tree care needs, please e-mail us at or call us at (801) 972-8733.
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Certified Arborists
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