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cornus controversa varegata on all of the branches they are coverd by small shells beetle like which are all white & sticky when removed could please tell me what they could be
thanks steve



Sounds like scale insect - google for images, though there are different kinds of scale. Provado make a spray treatment for these, but it affects bees - if you can easily access the worst areas, better to use methylated spirits on a piece of soft material - rub the meths over the scale.

8 May, 2011


There are various scale insects which look a bit like shells, eg. Mussel Scale. They cover themselves with a wax like substance which makes them waterproof so no insecticide spray can get at them easily. They suck the sap from plants and can do a lot of damage. Fortunately they are fairly sedentary except when very young so do not spread too quickly.
Now getting rid is more of a problem. If there are only a few then a dab of Methylated spirits on the insect will remove the wax covering and it then dies of dehydration. A lot and you are into spraying with a Horticultural soft soap preparation. There is one on the market called Winter Wash. You might need to spray a few times and used a soft brush dipped in the stuff to remove the most obstinate ones.
I have seen a pressure sprayer used to good effect but that would do the flowers on your cornus no good at all.

8 May, 2011


Snap. except that I have never found the Provado stuff to be good on Oyster scale myself.

8 May, 2011


I don't use it at all on anything, Owdboggy, as a point of principle - I've already noticed a significant reduction in the number of bees buzzing around the comfrey downstairs - used to be thick with them, now it's just the odd one or two.

8 May, 2011


Me neither, except in extreme cases in the Alpine house where bees do not normally go in any case. The Hort Soap does not affect bees by the way.

8 May, 2011

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