Help with what brand fungicide to buy?
Have many large mature (15+ year) rhodies (average of 9 feet tall) that are suffering badly.
Problem does not appear to be insects..think it is a fungal leaf spot disease? Not really sure, but reading this article published online by Clemson University and looking at the accompanying picture of Septoria leaf spot this looks like what I've got.
Recommended treatment is a fungicide...so I'm wondering what brand to use? Article mentions specific fungicide sprays like triadimefon, propiconazole, thiophanate-methyl, chlorothalonil or mancozeb but not which BRAND contains these ingredients.
I have never used a fungicide before so felt rather helpless the other day when confronted by the many many products out there! Can anyone recommend a brand that would contain one or more of these mentioned fungicides that they've used successfully? Any brands to stay away from????
Thanks in advance for your help!