As a rule, apricot fruits are less injured by Black Spot than those of the other susceptible stone - fruits like the peach and plum. However, certain varieties of apricots are severely affected; the Royal, Sweet Russian, Peach and Bread varieties are prominent in this respect.
The disease is also found on the twigs, where it shows as black spots, but these, as in the case of those on nectarine twigs, disappear, and open cankers develop to some extent. On the leaves a shot - hole effect is found subsequent to a dying of small areas (Fig. 44). (See Peach, page 306.)