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  1. #1
    HI

    I have had ivy leaf geraniums in my garden for many many years and never had any problems, but suddenly they are all dying off. The leaves are being eaten and the stems have holes in them, but I cannot see any insects.

    Does anyone have any idea what is causing this ?

    Many thanks


  2. #2
    Join Date
    Sep 2003
    Location
    Maryland zone 7
    Posts
    3,042
    Hi Malvizz,

    I'm wondering if you are in Europe, maybe France or Spain?* Maybe the UK or Africa?* There is a pest calledCacyreus marshalli aka Pelargonium butterfly that is found there that shows the same symptoms as your picture.* I can't find any reference to it in the US.
    http://www.eppo.org/QUARANTINE/insec.../CACYMA_ds.pdf

    I can't read this but the pictures tell me alot.
    http://www.botanical-online.com/flor...osageranio.htm

    Newt

  3. #3
    Hi Newt

    Many thanks for you reply. You are absolutely right, it is the Geranium Butterfly as the effects are exactly the same. This pest must have now reached Malta .
    I cannot read Spanish but as I can read Italian and as the two languages are similar I have (with a little bit of patience) been able to understand it.

    In the last piece titled "How to solve the problem", it says "Use a specific insecticide",
    but it does not mention any particular one. I shall have to search the internet to find one, but seeing that this is a new problem to our island, I doubt whether it will be available here.

    Once again thank you very much for your help and best regards.

  4. #4
    Join Date
    Sep 2003
    Location
    Maryland zone 7
    Posts
    3,042
    You are so very welcome!* Since you can read Italian, here's a site that might be helpful.
    http://it.wikipedia.org/wiki/Cacyreus_marshalli*

    Try a google search for more info with the name Cacyreus marshalli.*

    I'd love to know what you try and how it works.

    Good luck,
    Newt

  5. #5
    Many thanks Newt, this is the most helpful site yet as it gives all the insecticides that can be used against this pest in all its stages of developement. As all my plants were heavily infected, I decided to get rid of them all and start afresh. I noticed large numbers of this butterfly in summer and realised that I had never seen this species before, little thinking that it was the cause of this problem. Now that it is getting colder there are very few of them around. As I presume that they shall lay eggs I shall be spraying against the butterfly and larva at regular intervals.
    Will let you know the result in a few months time if you are interested.

    Thank you once again and best regards.

    Malvizz

  6. #6
    Join Date
    Sep 2003
    Location
    Maryland zone 7
    Posts
    3,042
    Malvizz, I would be very interested to know how things turn out and what you use.* I'm wondering if you should report this pest to whatever environmental agency you have locally.

    Good luck and let us know what happens.
    Newt

  7. #7
    Yes Newt, I will let you know of the result later on. I intend to use a contact insecticide (malathion) against the newly hatched grubs, and a systemic insecticide (haven't decide which yet) against the larva which have alreay drilled into the stalks.

    I did inform the agricultural department and they said that they knew about it. Whether or not they had informed the public I don't know as I spent all of October in the US on vacation, but a few days after my return I read in the local paper a statement by this department informing the public that a new pest which attacked palm trees had been noted and what action one should takeRegards

    Malvizz

  8. #8
    Join Date
    Sep 2003
    Location
    Maryland zone 7
    Posts
    3,042

    [align=left]*I intend to use a contact insecticide (malathion) against the newly hatched grubs[/align]

    [align=left]
    *[/align]
    [align=left]Malathion is a very strong insecticide even though it's been commonly used.* Please look over these sites.[/align]
    [align=left]http://en.wikipedia.org/wiki/Malathion[/align]
    [align=left]http://www.chem-tox.com/malathion/research/[/align]
    [align=left]http://extoxnet.orst.edu/pips/malathio.htm[/align]
    [align=left]Maybe you can do some research and find something like Bt for the grubs.* Are there any other ways or chemicals listed for this pest?[/align]
    [align=left]Do you remember what the agricultural department recommended for the palm tree pests?[/align]
    [align=left]Newt[/align]

  9. #9
    The Italian site gives various solutions. Please note that some are technical words which I do not understand, and I have put these in inverted comas. Of all the chemicals mentioned the only one I recognise is malathion. Furthermore I presume that these trade names are used in Italy but might go under a different name elsewhere.

    a)Treatment with "Bacillus thuringiensis var. kurstaki" or with "spinosad" or with synthetic products such as thiaclorid, thiamethoxam or fenitrothion, applied weekly for 3 consecutive weeks at the end of summer

    b)Treatment against eggs and newly hatched larva with "clorpirifos metil" and against larva at the "endofitica" stage with "citotropic" insecticides such as dimetoato, acefate and malathion

    c)Treatment with "Piretroids" (alfametrina, lambdacialotrina) and to regulate growth (diflubenzuro, esaflumuron)

  10. #10
    Sorry Newt, I missed your last part about palm trees.

    Please visit*** http://www.maltatoday.com.mt/2007/10/28/n1.html

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