Orange spots Cannas Dying
I hade a pretty nice clump of about 60 or so cannae. Last time I researched, they were from some australian variety. Yellow and Red flowers and grow up to about 6 feet tall (some even up to 8).
About 2 months ago, I saw some orange spots on the leaves. I attributed it to the insecticide I had been using to kill off leaf curlers.
Last weekend, I did a bit of pruning and noticed the following:
1) Newborn canna wer just dying out at about 2 feet high or so
2) All my cannae in this area had the orange spots, but on other areas of the garden, cannae were fine, even though I had used the same insecticide
3) Canna were pushing other plants out.
I pruned about 50 of my 60 canna in that area, leaving me with just a fe left, which I will probably be pruning today.
I don't know if this happend because of some parasite, because they were so tight together they couldn't get enough sunlight (the new ones were growing really slim), or if it had anything to do with that nast winter (we only got temps of 45 degrees for 4 days straight).
Anyone have any pointers?