Fruit calyx and stem end infection by mussel scale

Mussel scale infection is not confined to the calyx and stem end, and is frequently all over the surface.

 Heavy infestations of mussel scale on the bark and stems of apple trees can cause loss of production. The main economic damage from scale insects is fruit infection near the calyx or stem end, accompanied by fruit discolouration. However, unlike most other scale insects, mussel scale does not cause these red marks on the fruit. Stem infestation by tiny scale insects may appear to be a change in stem texture until examined closely.

To see the insect and..... for more information...

Key start