Cedar tree pest

Discussion in 'Gymnosperms (incl. Conifers)' started by Chris Klapwijk, Nov 7, 2003.

  1. Chris Klapwijk

    Chris Klapwijk Active Member 10 Years

    Likes Received:
    Black Ceek, B.C., Canada
    An acquaintance of mine in Oregon sent me the attached photo of a pest that is chewing up his cedar trees.
    I believe it to be Semanotus ligneus, or cedar tree borer.
    Can anyone confirm or deny this and make any suggestions regarding control?

    Thank you.

    Attached Files:

  2. douglas

    douglas Active Member 10 Years

    Likes Received:
    princegeorge b.c
    Looks like a male japanese cedar borer. you check out www.aphis.usda.gov/oa/pubs/pajclb.pdf for more info

    hope this helps
  3. Chris Klapwijk

    Chris Klapwijk Active Member 10 Years

    Likes Received:
    Black Ceek, B.C., Canada
    Thanks Douglas, but according to the web page you referred to, an adult Callidiellum rufipenne is between 8 and 15 mm long.
    This pest measures about 30 mm.

    Would anyone else like to venture a guess?
  4. mr.shep

    mr.shep Well-Known Member 10 Years

    Likes Received:
    San Joaquin Valley, California
    Hi Chris:

    Are you still interested in this one? I can rule
    out Semanotus ligneus. I just went through the
    Oregon's Department of Forestry's web site and
    came up empty. The irritating thing for me is
    that I know this insect. I've seen it before at my
    cabin near Yosemite and thought then and still
    think it is not a borer. Engraver Beetle perhaps
    but not a true borer.

    What kind of Cedar (Port Orford, Incense,
    Western Red Cedar) was this insect hitting
    and what was the visible damage to the trees?

    Usually when I see a metallic body I think of
    Flathead Borers but rarely do they ever get as
    big as this insect is. Only in the mountains and
    generally attacking Sugar, every now and then
    a Western White and Ponderosa Pines (their
    favorite Pine from what I've seen) do we see
    them with any real size to the adults. In Fruit
    Trees and in some ornamental trees the adults
    are quite small, about the size of a Whitefly.

    I'll work on it if you still have interest in this
    one. I will say that the Sevin recommendation
    from the Oregon St. University Extension for
    Cedar Tree Borers leaves me shaking my head
    in disbelief. Obviously they have not updated
    their controls from what they knew several years
    ago. For a bona fide borer Lindane sprayed
    under the bark or any strong organo-phosphate
    also sprayed under the bark can be used but
    generally only when a serious, unmanageable
    outbreak is what we are looking at. Sorry but
    topographical sprays are almost useless as it is
    not the adults that cause us the most damage,
    it is the larvae of the Cedar Tree Borers instead.
    A good preventative oddly enough is Creosote
    applied in a circle around the base of the tree.
    Adult borers generally will not go near it.

    Borers and Conifers go hand and hand. If the
    tree has not become stressed usually due to a
    prolonged drought then the borers and bark
    beetles are not enough to kill the trees.
    Western Bark Beetles hit a weakened tree
    with such voracity in numbers that the tree
    simply does not have a chance to withstand
    the attack. They are real small critters, about
    .5cm in length and are a metallic brown in

  5. mr.shep

    mr.shep Well-Known Member 10 Years

    Likes Received:
    San Joaquin Valley, California
  6. further details on this insect

    THis bug was in a Port Orford (Lawson's) cedar of about 15 years age, 12 inch diameter at the base. I dug two of them out of tunnels in the wood, the photograph was of the live one (the other came out in pieces). The stem was totally girdled under the bark for a vertical distance of about 2 feet, with more tunnels going up to some 8 ft above the ground. Ite adult form was in a tunnel that went into the sapwood rather than just staying under the bark.

    I've lost a couple other Port Orfords with the same insect damage inside. ANd I see a LOT of cedar trees around the city (Vancouver, WA) that all turn yellow and dead in one season. Can't believe that all fo them are suddenly being weakened by phytophera-like fungi and suddendly becoming insect-prone.
  7. mr.shep

    mr.shep Well-Known Member 10 Years

    Likes Received:
    San Joaquin Valley, California
    Hi Luurt:

    I believe you as I know what I've seen when we
    cut into the bark of a fallen 150+ year old Incense

    We found larvae that made their own fissures deep
    into the cambium. We saw no adults but it was the
    size of the larvae that shocked us. They were no
    less than 5" in length and just the head on them
    was almost ¾" wide. They were by far and away
    the largest borer type larvae I've ever seen to date.
    We collected some of them and later I asked around
    as to what the insect was and asked what size the
    adults would be. I was given a name but it was not
    correct at that time but I was told by more than one
    person with a straight face that the adults would get
    no more than 1" in size. I did not believe them then
    and still do not.

    As far as this beetle goes I may have some egg on
    my face with the first post but I honestly did not
    feel this was a true borer. A root borer is what
    this insect is referred to but that does not mean
    that it cannot traverse up the tree instead of down.
    There are some adult borers that are much more
    of a problem than their larvae are but I am too
    accustomed to seeing larvae doing the damage
    much more often than the adults.

    Still, these beetles are gigantic in size and if a
    few of them get in a relatively young tree I
    do not know what the tree can do to fight
    them off especially once the beetle gets into
    into the cambium or into soft wood.

    I will not get into the phytophthora issue at
    this time.

    I know what happened to pretty much healthy
    50-150 year old Ponderosa Pines that got hit
    by the Western Bark Beetle. In less than one
    season, actually in 3 months, the trees went
    from looking real good to having their tops
    starting to die back about 10-30 feet with
    outward sap deposits allover the tree. When
    I had a professional crew come in and fell
    the trees long before they were dead, we
    could not believe our eyes when literally
    thousands of the beetles were emitted into
    the air as soon as the tree hit the ground.
    After losing 35 old Ponderosas, not including
    some young Sugar Pines, I sprayed a 77%
    Chlordane solution mixed with Creosote
    around the perimeter of the property. I've
    not lost a single tree due to a bark beetle
    in 13 years since.

    I do not like direct injections unless we
    can place the chemical exactly where we
    want it to go. I'll cut away a portion of
    the bark and use a fine mist to move the
    spray up, down and around just under the
    bark and the cover up the cut portion, even
    with tree sealer if need be. I want my spray
    to act as a fumigant inside the tree. If little
    or none of the chemical can dissipate out
    then I will get a systemic like action inside
    the tree as well as a fumigant outside the
    cambium. If there are any larvae inside the
    bark they generally will be goners. You
    may have to do something similar, unless
    an Arborist can guarantee you somewhere
    between 75-100% effectiveness with the
    chemical injections or you pay nothing for
    their services. Try that on them and then
    see how they want to play things.

  8. i live in west chester Pa about 30 miles west of Philly I have a beautiful Cedar tree in my yard but it has several rings of what I believe to be borers holes. Is there any type of chemical I can use to kill these pests.
    Thank you
    Ed Clare
  9. Eliza

    Eliza Member

    Likes Received:
    Philadelphia, Pennsylvania
    I have also seed the ring of holes in a Deodar cedar that appear to be some type of borer. This tree is more common to more southern US, but I have a very nice specimen here near Philadelphia Pennsylvania.

    Any comments or suggestions would be appreciated.


Share This Page