The culprit is believed to be the caterpillar of the Ermine moth
. Eggs laid by the moth in the trees the year before hatch into the hungry caterpillars who then spin the beautiful webs to protect them from predators.
Butterfly Conservation said this is ermine moth
A council spokesman said: "We are aware of a non-hazardous infestation of bird cherry ermine moth
caterpillars at St Dogmaels Avenue in Llanishen.
Caterpillars of the bird-cherry ermine moth
colonised trees at the attraction and created the sight.
The infestation was blamed on the yponomeuta padella, the caterpillar of the orchard ermine moth
Local wildlife experts reckoned the natural phenomenon, which looked like a spooky Halloween scene, was the work of the caterpillar of the birdcherry ermine moth
Unfortunately for people trying to identify a spindle ermine moth
, they are almost identical to the apple, but can be distinguished by the fact they eat spindle, not fruit trees.
The web appears to be the work of ermine moth
The image was created by bird cherry ermine moth
caterpillars, which experts say are doing no harm to the trees.
The apple ermine moth
, Yponomeuta malinellus Zeller (Lepidoptera: Yponomeutidae), is a univoltine defoliator of Malus species in Europe and Asia.
Yponomeuta Padella, or ermine moth
caterpillars weave an intricate web over a roadside hawthorn hedge and speed sign in Catherington near Portsmouth yesterday.
THIS is probably the ermine moth
. Spraying with an insecticide such as derris usually works, but prune any badly-affected branches.