Mussel scale
- Occurs on many other woody host plants. Fruit crop hosts include apple, pear, cherry, plum, bilberry and less frequently currant and gooseberry.
- Other hosts include blackthorn, cotoneaster, hawthorn, heath, heather and many others.
- Populations on hawthorn, heather and other wild plants are believed to be the main sources of infestation of orchards.
Other scale insects
- In the UK, oyster scale occurs on apple, apricot, birch, cherry, currant, nectarine, peach, pear and plum. Birch is considered to be the original host.
- Pear scale occurs on apple, peach, pear and poplar.
- Nut scale occurs on apple, pear and plum.