Picea engelmannii 'Bush's Lace' or other cultivars3 replies
Oh yes ... definitely susceptible to both of those! These species have evolved to thrive in semi-arid steppe climate. They hate humidity and hot nights, which makes them ill-suited for the midwest's humid continental climate.
Rats! Are there any spruce that aren't susceptible to these diseases? I haven't seen diseases on 'Bush's Lace' at various gardens I have visited.
for spruce, your best bet is to seek out species native to Japan and China. I know for certain that Picea meyeri gets along well with humidity. I have 'Bush's Lace' in Washington state. Some years it's really lousy with the needlecast. These steppe plants don't like our wet springs.