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Dendrobium Beetles - Stethopachys formosa Time to revisit

Dendrobium Beetle Stethopachys formosa      The Destroyer!!!
As The Australian Orchid Nursery is located 75 kilometres south east of Melbourne we have no epiphytic orchids or ferns within 300 kilometres of us. As a result, there are no natural orchid pests such as Dendrobium beetles down here!
 
Our cold winters don't allow them to survive. It seems they start around Lakes Entrance in far east Victoria and then go all the way to Cape York in north Queensland. I have only seen them in the wild three times. Once at Merimbula on an isolated outcrop of Dendrobium speciosums, once at Brogo NSW, and finally on the Atherton Tableland munching on Dendrobium speciosum pedunculatums.
 
    
I would try Diazonon for an instant kill of the grubs, followed by Confidor pills to stop re-infection, then a Carbaryl spray over the leaves and blooms to take out the adults eating.
For those that like using the bigs guns for commercial control there is a PDF below on the subject. Its the online Wiley one.
If you have any tips for helping get rid of Dendrobium beetles, please comment below!
Over on our Facebook, Phil has one piece of advice that I'm sure has 100% effectiveness!
Here are some great links though to make you all experts.


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  • Rosemarie on

    The rotten little suckers will even find their way into a bush house . I know . If someone has a secret deterrent then I would love to hear or see it . Has anyone tried neem oil ? I worry that these sprays will damage the plants .
    I have recently found the odd 1 sucking and nibbling on my long awaited flowering . Such a huge disappointment .

  • ROb on

    These Beetles just wait for new growth and particularly the annual flowering sprout on my Cooktown orchid.I wait all year to see these beautiful flowers only to have them eaten by this rotten Beetle. How they know ,is beyond me but by the time you spray your orchid these guy s have already done the damage. They must use scent to detect new growth. Maybe some smelly deterant is the fix.

  • Wayne Turville on

    Maybe condsider trying yellow or blue sticky traps next to plants.
    Speciosum blooms are YELLOW!

  • KRistine LIsle on

    Those b dendrobium beetles ate my cymbidium flowers this year the worst I have seen them.
    What is the best cue for killing them I did read your article above. Carbaryl is a bit toxic? Hard to purchase.
    I have about 20 plants I am only an amateur grower. I have quite a lot of dendrobiums, they eat them too.
    Not Happy Jan. Any ideas??? Love your video .

  • Jenny Davis on

    I several large tubs of Dancing Lady orchids standing out in the open garden .They all with multiple long spikes about to come into flower. Once again the new tips have a grub that appears to only hatches at night. I suspect I have the wretched Dendrobium Beetle . I’ve never seen sign of any beetles or larvae. I still have some Confidor spray. I’ve just sprayed down into the base of all my tubs. . We are Organic Gardeners so have used this as a last resort…… you’re comments and advice please. Thanks..Jenny.



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