Apple black spot is a different fungus to pear black spot, and both are different to black spot on roses. The initial infection in the spring shows up as dark green velvety patches on the leaves and developing fruit. Later the lesions on the leaves become black and slightly raised.
Black spot is a wet weather disease.
In general, the higher the temperature and the longer it rains, the more severe the infection period will be. Apple black spot is found all over the world where-ever apples are grown. In New Zealand, black spot is an important problem in all regions. Even the smallest black spot is unacceptable on an export apple. The disease can develop in coolstore as a result of infection which has occurred in the orchard before harvest.