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Utah Pests & Pathogens

 

Aphids

Aphids are one of the most common insect found on trees. With over 400 different species that feed on a variety of trees. While aphids look more unsightly than cause damage to established trees they do secrete honeydew which can cause the tree to be sticky or anything it drips onto.

Symptoms:

Curled and discolored leaves

Plant sap secreted as honeydew

Spots of sap on cars, sidewalks, houses

Trees Effected:

They can be found on virtually any tree.

Treatments:

Systemic Injection Pesticide

Organic basil drench

 

Poplar Borer

The poplar bore is the most common borer found in aspens, other species of poplar trees and have also been found in willows. Large trees are rarely killed by the insect. It may cause decline of the tree, weak branches and allow introduction of other diseases or pests into the host.

Signs and Symptoms:

Woodpecker activity

Wet spots of sap and wood shavings

Black spots found below the borer holes

Trees Effected:

Aspens, poplars, and willows

Treatments:

Systemic Injection Pesticide

Organic basil drench

 

Ips Beetle

Ips beetles are the most common bark beetles in conifers. Bark beetles as a whole are one of the most destructive pests in forests in the world. As individuals they are ineffective at killing a tree. They send out pioneer beetles to find a host and once getting into the tree give off a scent for others to follow.

Signs & Symptoms:

Small holes in bark

Off colored branches

Sap looking stuff called pitch coming out of tree.

Trees Effected:

Conifers such as Lodgepole, Limber, Ponderosa, Pinyon and other pines.

Treatments:

Systemic Injection Pesticide.

Organic basil drench.

 

Mountain Pine Beetle (MPB)

MPB is the most common Bark beetle in the west and is responsible for devastating the Forests in the Mountain West.  

Signs & Symptoms:

Large entry points along trunk of Tree

Off colored branches, and discolored needles.

Large pockets of sap, called pitch tubes from the trunk of the tree

Trees Effected:

Conifers such as Lodgepole, Ponderosa, Pinyon and other pines.

Treatments:

Systemic Injection Pesticide

Organic basil drench

 

Pine Needle Scale

Pine needle scale is a small armored scale that attaches itself to the needles of pines, spruces and fir trees. Once the insect is attached they produce a hard waxy shell that is visible to the naked eye. They feed on the sugars that are contained in the needle.

Signs & Symptoms:

Thin canopies due to infected needles dropping.

Silver appearance from a distance in heavily infested trees.

Numerous, circular shaped white insects on needles.

Trees Effected:

Pines (Scots and Mugos especially), firs and spruces.

Treatments:

Systemic Injection Pesticide

Organic basil drench

 

Poplar Bud Gall Mite

The poplar bud gall mite is a microscopic mite that is not visible with the naked eye. Species of trees effected by the mite are Aspens, Cottonwoods and Poplars. Mites are flightless but due to their small nature are able to hitch rides on wind currents, birds and other insects.

Signs & Symptoms:

Woody cauliflower like galls that develop on leaf buds.

Trees Effected:

Aspens, Cottonwoods and Poplars.

Treatments:

Systemic Injection Pesticide

Organic basil drench

 

Apple Scab

Apple scab is a fungal disease of crabapple and Apple trees. It will not kill the host but causes leaves to fall early. The fungus survives the winter in the fallen leaves.

Signs & Symptoms:

Brown and olive colored leaves that eventually turn black

Badly infected leaves turn yellow then fall off the branches

Fruit may mature unevenly and crack

Trees Effected:

Apple and Crabapple

Treatments:

Systemic Injection Pesticide

Organic basil drench

 

Iron Chlorosis

Iron Chlorosis is the most common nutrient problem of ornamentals, trees, shrubs and vines. The plants are unable to uptake iron from the soil. The leaves of the affected host are light green, yellow or white with bright green veins. Severely affected leaves will scorch and die during the summer. It may vary year to year or during the seasons. Most times only part of the plant will show signs while the rest of it is healthy.

Signs & Symptoms:

Light green, yellow, or white leaves

Burnt looking leaves

Trees Effected:

All ornamentals, trees and shrubs.

Treatments:

Systemic Injection Pesticide

Organic basil drench

 

Lilac Ash Borer

Adult lilac ash borers resemble wasps in all aspects but in fact it is actually a type of moth. The female emits a pheromone to attract males 2 weeks after coming out of the tree. Within a hour they lay upwards of 400 eggs. They do not usually kill their host but cause weak wood which in turn can be a hazard.

Signs & Symptoms:

Limbs dying

Round exit holes

Empty pupal cases

Loose bark and wounds

Weakened limbs that can break easily

Trees Effected:

Lilacs, Ash, Privet

Treatments:

Systemic Injection Pesticide

Organic basil drench

 

Locust Borer

The locust borer has been a pest of the Black Locust since 1702. They only have one host that being the black locust and not any other species of locust. Damaged, drought deficient, nutritional stressed and immature trees are most often attacked.

Signs & Symptoms:

Wood stained yellow that turns brown

Sap out of holes

Sawdust like substance out of holes

Trees Effected:

Black Locust

Treatments:

Systemic Injection Pesticide

Organic basil drench

 

Aspen leaf spot

Aspen leaf spot is caused by a fungi that causes leaves to have dead (black) spots on them with yellowing around them. It can be mistaken for iron deficiency (Chlorosis).

Signs & Symptoms:

Dead spots on leaves

Yellowing around those dead spots

Trees Effected:

Aspens

Treatments:

Systemic Injection Pesticide

Organic basil drench

 

Leaf Scorch

Leaf scorch is a disease of plants which happens when the tree is unable to get enough water to the top of the plant. Occurs most frequently when temperatures are high, during droughts and windy. Possible causes are shallow watering, girdling roots, lack of water after getting a new tree, and trunk injuries from lawn equipment.

Signs & Symptoms:

Burnt looking leaves

New leaves are more susceptible

Trees Effected:

All plants, most likely found on Ash, Chestnut, Elm, Maple and Poplar.

Treatments:

Systemic Injection Pesticide

Organic basil drench