It is probable that all apple varieties may be attacked but there are considerable differences in the susceptibility of different varieties:
- Varieties with fruits that are short stalked and/or which hang in clusters and where dead leaf and flower debris accumulates round the stalks tend to suffer the most damage.
- Bramley and Egremont Russet are amongst the most susceptible.
- Cox and Worcester are moderately susceptible, Golden Delicious is less susceptible.