honey suckle

honey suckle

14.7.14

A PEST OF ROSES

Anoplophora malasiaca is the most dreadful pest of roses in Japan.  Most of gardeners have a experience of its damage to large rose stems.
A larva of it is called 'Teppo-Mushi' in Japan, which means 'rifle worm' in Japanese.  Eggs of Anoplophora malasiaca are laid into stems of various trees including roses.  A larva eats pith of stem and make a tunnel within it, just like the way stem borers do.  It looks like a bullet in a barrel of a rifle.

They come to gardens in June and July to lay eggs.  They usually fly to the top of roses with a height of more than 1.7 meter, and move down to a large part of branch or stem, most often to the point several inches from the ground.

Roses, especially climbing ones, often wither due to this pest.  We had lost a Rosa 'Pierre de Ronsard' several years ago.  Fortunately  Rosa 'Paul's Himalayan Musk' and Rosa 'François Juranville' had withstood attacks to their large branches.

Yesterday my wife found and caught it (below).
Anoplophora malasiac

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Four pictures below are situations of damage and precautionary measures in our garden.

Fine wood particles are attached on the surface of a rose stem.  This is a sign of a larva of Anoplophora malasiac. (Rosa 'Summer Snow, September 2012)

After removing the wood particles, holes of the back side of stems were found using a mirror.  By using a wire, larvae had been squashed.  (Rosa 'François Juranville', July 2012)

In order to prevent the damage, we used a fine net.  (Rosa 'Paul's Himalayan Musk') 

Another method is to coat the surface of large stems with special emulsion of resin.  (Rosa 'Summer Snow', April 2013)

Every two weeks from spring to autumn, we must check the signs of Anoplophora malasiaca about all of the roses in our garden.  (But we often forget it!)

3 comments:

  1. Dear Poirot
    This looks like a horrible pest. I hope you managed to protect your beautiful roses from it.
    Best wishes
    Ellie

    ReplyDelete
  2. ポアロさん、こんにちは♪
    なつかしいゴマダラカミキリ!
    「なつかしい」なんて言うと叱られそうですが、日本にいた時は果樹やバラなどにたくさん付いて被害を受けました。
    イギリスにもカミキリムシはいるのですが、日本ほど種類は多くなく、
    私が見たことがあるのはMusk beetleというメタリックグリーン(またはブルー)の1種だけですが、
    これはバラには付かず、柳に付くようです。

    ReplyDelete
    Replies
    1. lapisさん、コメントありがとうございます。
      確かにイチジクやカリンの木も被害をうけています。
      こどもの頃は昆虫採集の対象でしたが、今は指名手配のギャング扱いです(笑)

      Delete

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