It's really sad in this day and age that we can't find effective methods to
deal with blights that cause wide scale destruction.

I must have missed something. I understand 'Jacqueline Hillier' is quite
disease resistant. My 'Seiju' gets leaf gall mites, but they are easily dealt
with by Orthenex.
Iris,
Central NY, Zone 5a, Sunset Zone 40
"If we see light at the end of the tunnel, It's the light of the oncoming
train."
Robert Lowell (1917-1977)