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Today in Kongens Have, I noticed a lot of white dots on bark of trees. There are plenty of them, and they were usually on 'bottom' side of branches. Does anyone know what this could be?

I took a photo:

Kongens Have photo

I suspect some pupa of insects, but it is just a quess.

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up vote 13 down vote accepted

I'm not 100% sure, but I think they look like scale insects (Coccoidea). In particular it looks at bit like a hermaphrodite cottony cushion scale insect (Icerya purchasi)...

enter image description here

The white fluffy thing underneath the insects is the ootheca (egg case). The mature insect migrates to the main trunk of its host tree and attaches to the bark. It then secretes the cottony sack between itself and the bark. Hundreds of eggs are laid into the case, which eventually hatches and the nymphs disperse to the tips of branches where they feed on leaves. As they get older they gradually move first to twigs, then to branches and finally back to the main trunk to breed again.

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Thanks a lot Richard for help – mrok Jul 23 '12 at 19:19

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