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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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  • 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.

  • J on

    Hello
    I live in the Sutherland shire and they come every summer and infest my beautiful native orchids – King orchids, rock lilies , crucifix orchids , pencil orchid and tongue button orchids. This year Autumn is quite warm still and they have lingered and now infesting my cynbidium orchids – laying their eggs and hatchlings in the flower spikes and damaging them. I just don’t know how to prevent them from attacking my orchids – without enclosing my orchids in a bush house .

  • Marise McGlinn on

    Do bug zappers attract them in?

  • Kristine LIsle on

    Found some more yesterday eating my new buds on my Summer Flowering Laelia Orchid, I did manage to squash three , I have sprayed with Eco Oil .What makes the brown marks on these orchids is it these Dendrobium Bugs if so they sure do some damage. Has anyone used Derris Dust?????

  • KRistine LIsle on

    I just found three eating my flowers spikes on my orchid, I squashed with my foot but they have already done the damage. Not Happy. Thornleigh . NSW.



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