A few cases of Summer Spot are being seen in the Goulburn Valley at the moment. Summer Spot is a secondary infection of Black Spot (or Apple and Pear Scab).
With upcoming rain forecast Summer Spot needs to be managed now. It would also be worth having a look at the spray program and work out whether is was spray timing or another issue that caused a problem in their black spot management.
Late Spring and early Summer is a good time to intensively scout your apple and pear blocks to look for primary infections and determine the potential for secondary infection. Secondary infection through Summer and Autumn come from primary infections established in the tree that Spring.
See our videos on Black Spot (Scab) Management and our article: Do I have primary scab infection and what does this mean for my summer-autumn spray program