Small (<10mm) brown circles attached to a bay tree trunk with silky stuff.
No interactions present.
Horse-Chestnut Scale, very bad infestatiions this year in parts of Leicester; Sycamore & Tilias in particular, but many other trees can be affected.
Is it an egg or type of coccoon? Also, are they harmful to the tree?
In the white fluff is the egg mass which is also protected by the exoskeleton of the dead female. Young will hatch, move over the tree the ultimately settle and become static. Once mature, eggs will be produced.
Anything which sucks sap is likely to be detrimental, reducing sugar etc, they also produce sticky Honeydew which makes plants unsightly. Trees dont appear to suffer,though smaller shrubs may from a heavy infestaion.
Ants do appear to attend them for the honeydew sugars.
Lat/Lng: 51.9, 1.3
OS grid ref: TM3034