The Cleary's 3336 is a systemic. Btw, I found it on Amazon for $61 for a quart, but I thought even that was too much for the small amount I would ever use. Couldn't buy it in a smaller size.
I tried a new product from Bayer called Natria last week. It's a sulphur compound combined with pyrethrins so it's fungicide and insecticide together. It's rather thick and leaves a coating on the leaves, too. Part of that is whatever they're using as a surfactant i.e. the spreader, sticker component that makes it stay on the plant. It's hard to spray, as well.
This is the big month for fungal infections, as we have terrible humidity plus longer periods of wet weather in September, it seems. So far I've had a lot less black spots showing up than usual, and of course part of that is because I moved most of my Catts under cover before I left for my last trip, so they are drying out, and only getting wet when I water them. That and better air movement from more spacing . . . it all helps.
