Publications for:

pest = Rhizosphaera kalkhoffii
crop = Spruce (Picea)

found 2 publications:

2009

Lophodermium piceae and Rhizosphaera kalkhoffii in Norway spruce: correlations with host age and climatic features
Phytopathologia Mediterranea (2009) 48 (2), 226-239
pestinfo wiki

2002

First report of Stigmina lautii in the United States
Plant Disease (2002) 86 (6), p. 699
publishers website - pestinfo wiki