These are dwarf dahlias and they've started getting this you see on the pictures. The first two pictures is an orange and red dahlia and the third picture is a yellow dahlia which has some other disease. What do you think this is on my dahlias and how can I cure them?? Here are the other 2 pictures: http://i149.photobucket.com/albums/s49/locoboy0712/DSC00267.jpg http://i149.photobucket.com/albums/s49/locoboy0712/DSC00268.jpg
Read here and see if this answers your question, I think this will help you solve the problem.
http://davesgarden.com/community/forums/t/518178/
Christine
looks more like thrip or mite damage
It looks like an iron deficiency to me.
Looks like a defiency here too, or a chlorosis from tap water, maybe both
