My beloved white dahlias have come up and are blooming nicely. So is our old peach-colored dahlia, which we've had for years.
Now for the bad news. Nearly all the plants, including our old peach and white plants, have some sort of disease or blight, plus some insect issues as is evident by the holes in the leaves. But the brown patches on the leaves are what concern me. Whatever is plaguing the plants is spreading. So far the spots are only on some of the leaves, and the majority still look okay, but I need to identify this problem ASAP so we can properly treat the plants.
Does anyone know what this could be? I'm going to take a couple of leaves to a garden shop to see if they can identify it. If they can't, I'll turn to the agricultural extension. We've never had this problem with our dahlias until this year. We've dealt with pests such as earwigs, slugs and aphids, but not to the point of ruining the plants, and we've always been able to control them. But these awful looking brown spots are something new. If you have any information or advice, please share! Thank you.
Update: I took some leaves to my local garden shop and they thought it was sun scorch in spots where water was on the leaves. I stopped watering from above and began using the hose at the base of the plants. Problem solved.