Calgary Arborist – News & Resources

A hole in your hedge?

We have been seeing a number of hedges around Calgary the last few years that are severely infested with Oystershell Scale. The damage appears as large sections of the hedge that “dieback” or fail to leaf out due to the infestation. This results in a very patchy, ragged look.

Oyster shell scale on Cotoneaster

As you can see in the picture, the insects are shaped like small Oyster Shells. They are part of a group of insects called “Armored Scale”. They are given this name as the outer shell of the Adult insect is “armored” which makes it impenetrable to traditional pesticide sprays. This makes timing imperative when deciding to have your hedge treated. The insect is susceptible at an early stage in June before it had developed its armored coating.

The best defense against Oystershell Scale is prevention, keep your hedge healthy by thinning the thick ends of branches and stems to allow more light and air penetration to the inner canopy. When shaping, attempt to leave the bottom of the hedge a few inches wider than the top, this allows for more light to be absorbed by the lower branches helping to keep them healthy and pest free.

We have lots of information on this insect available on our pest and disease page >>Oystershell Scale

If you are concerned about your hedge, think it may be infested or just want to keep it healthy, don’t hesitate to contact us to come out for a free assessment – you can request a free quote here.
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7 comments… add one
  • Denise

    February 15, 2016, 11:48 am

    We have 4 30 year old evergreens that are stressed. Huge needle drop this winter.

    And a 30 year old hedge with oyster shell scale

    Reply
    • Matt Davis

      April 11, 2016, 11:50 am

      Hello Denise,

      We are terribly sorry for the late reply. If you still require a quote for this service, please use our Quote Request Form to send us your info and we can get you a quote this week.
      Thanks,

      Matt Davis
      Adair Tree Care Ltd.

      Reply
  • Dorothy

    April 5, 2016, 2:26 pm

    Hi there!

    Our shrub is infested by this Oystershell Scale. I would like to ask for a quote on the treatment.

    Hope to hear from you. Thank you!

    Reply
    • Matt Davis

      April 11, 2016, 11:42 am

      Hello Dorothy,
      Please send us your info using our Quote Request Form and we can come out and have a look this week and get you an estimate.
      Thanks!
      Matt Davis
      Adair Tree Care Ltd.

      Reply
  • Dorothy

    April 8, 2016, 7:22 pm

    Hi there!

    Our hedge by our house is affected by this Oystershell Scale. I want to know how much it will treat this infestation?

    Reply
    • Matt Davis

      April 11, 2016, 11:44 am

      Hello Dorothy,
      Please send us your info using our Quote Request Form and we can come out and have a look this week and get you an estimate.
      Thanks!
      Matt Davis
      Adair Tree Care Ltd.

      Reply
  • Janine

    May 1, 2017, 11:02 pm

    I’ve noticed what appears to be Coral Fungus on my cotoneaster hedge. Now I will be taking a look for this awful oystershell scale.

    Reply

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