I will run out and find some Safers Defender. I have several Zygos that arrived with the black spots. Does Lowes sell it?
I will soon be posting a pic of a Zygo which is in bud now. It is the only one to flower several times a year for me. It is LOUISENDORF ‘RHEIN CLOWN’. Another thing I like about this one is it doesn't get too tall.