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Horticulture Services

Many landowners and homeowners are recognizing the importance and value of trees in their yards. Trees are a defining characteristic of rural farm yards and homes on the prairies, and many have been on the property for generations. They help to beautify and provide shelter to a yard. They also provide habitat for birds and other animals.

A tall, mature tree can take decades to become well established, and if not properly cared for, can become quite expensive to maintain and even more so to replace. However, if care and attention are given to trees, they can be very beneficial to the landowner and the yard, and will continue to live for many more decades. For example, poplar trees can live 50 years and a spruce tree can live for 200 years or more!

Local Pests
In this region, there are several pests and diseases that can negatively affect the health and appearance of trees. These pests can be found in both deciduous (leaf bearing) and coniferous (needle and cone bearing) trees. A pest is any living organism that can cause damage or injury to people or property, reduce economic yield, or interfere with regular human activities.

Through various methods and means, pests of trees can be maintained and controlled. The first step towards maintenance and control is identifying the type of pest that is present. Listed below are some common pests of this region, how to identify them, and potential control measures.  

Spraying Services
The Agricultural Service Board of the Municipal District of Taber provides a tree spraying service to residents. Trained individuals can come to your yard and assist you in identifying any pests that are affecting your trees. After identifying the pest, they will discuss potential treatment options with you. If an insecticide application is the best option to control the pest, several different products can be used to provide the best and most effective pest management and control. If you have any questions about this tree spraying service or about any potential pests in your trees, please feel free to contact the Agricultural Service Board and Request tree spraying here

Aphids

Characteristics
Aphids are small insects that vary in color from white to yellow to green and may have wings.

Damage
  • Attack deciduous trees
  • Can cause wilting or yellowing of leaves
  • In small numbers the damage is mostly aesthetic and generally will not pose a threat to the health of trees or plants
Control
Aphids have many natural predators, including ladybugs and their larvae so an insecticide application is not recommended unless the infestation is very severe.


Forest Tent Caterpillars

Characteristics
The Forest Tent Caterpillar has dark brown or black larvae with blue stripes along the length of the body and white spots on their backs that resemble a boot or footprint. Usually reach about 2 inches in length.

Damage
  • Attack deciduous trees
  • Feed on leaves
  • Can cause excessive damage and have the potential to defoliate a tree if the infestation is severe.
Control
  • Can be controlled by manual removal if the infestation is mild
  • Insecticide application in the spring and early summer


Ladybugs

Characteristics
Ladybugs are very common and easily recognized because of their black appearance with red or orange wing covers and black spots. Larvae of the ladybug are black with red, orange or yellow stripes or spots. Ladybugs can be found in almost any kind of tree or plant.

Benefit
Ladybugs and their larvae are considered very beneficial to a yard or garden as they will feed on aphids and scale insects, as well as other tree and plant pests.



Leaf Rollers

Characteristics
Green caterpillar with a brown or black head. Relatively small at about ¾ to 1 inch long. Roll themselves in leaves for protection and to pupate.

Damage
  • Attack deciduous trees
  • Feed on leaves
  • Mostly aesthetic and in small numbers generally won’t affect the health of the tree
Control
  • Easily controlled by manual removal of larvae or rolled leaves
  • Dormant oil in the early spring will help to control numbers
  • If infestation is heavy enough, an insecticide application may be necessary

Needle Cast

Characteristics
Need cast is a fungal disease of conifers and causes a brownish purple discoloration of the needles, which eventually die and fall off.

Damage
  • Attacks conifers
  • If left untreated, can cause a tree to lose all its needles and die
Control
A fungicide applied twice a year for two or three years will help to control the fungal disease and prevent it from spreading.


Needle Scale

Characteristics
Pine Needle Scale are very small insects that covers itself with a hard, scale-like shell that appears as a white spot on needles.

Damage
  • Attacks conifers
  • Can cause yellowing of needles
  • Mostly aesthetic, generally not posing a real threat to the health of the tree in smaller numbers
Control
  • Application of dormant oil in the early spring is the best option
  • Insecticide application will offer some control
  • Manual removal is an option, but in most cases is too labor intensive and time consuming


Spider Mites

Characteristics
Spider Mites are very tiny and hard to see, therefore difficult to identify. They are typically less than 1 millimeters in length and red or brown in color and produce a webbing at the base of the needles.

Damage
  • Attack conifers
  • May cause yellowing of needles
  • Usually do not pose a major threat to the health of the tree in smaller numbers
Control
  • Can be controlled by washing the tree down with high pressure water
  • A miticide application may be needed if infestation becomes severe
  • Dormant oil application in the early spring will help to control numbers


Spruce Budworm

More information can be found here


Yellow Headed Spruce Sawfly

Characteristics
The Yellow Headed Spruce Sawfly produces a green larva with a prominent yellow or amber coloured head and thin grey strips running the length of the body and is fairly small at about 1 inch in length.

Damage
  • Attack conifers
  • Feed on needles
  • Can cause extensive damage to spruce trees if the infestation becomes severe
Control
  • Manual removal is an option for mild infestation
  • Insecticide application is generally the most effective method to controlRequest tree spraying here