You said "radiation should not be ruled out" but DID NOT SAY IT'S THE ONLY CAUSE which is what the DUer detractors implied.
I like the analysis from National Geographic which says:
"Its possible the flower deformity could have been induced by radiation, says Jeffrey J. Doyle, a professor of plant biology at Cornell University. However, this is a pretty common mutation in daisies that Ive seen sporadically in various places not associated with radioactivity, he says.
There are many factors that can cause the oddity, Doyle says, from chemicals to diseases, a hormone imbalance, or random mutations to inherited genes. This particular malformation has been seen in numerous species of the worlds 20,000 members of the daisy family, from Holland to Idaho.
He's not ruling out a role for Fukushima: It wouldnt surprise me to find mutations of all types, including this one, in places that have higher than average levels of mutagenic agents, such as a radioactive site or toxic waste dump.
See what National Graphic has to say:
http://news.nationalgeographic.com/2015/07/150723-fukushima-mutated-daisies-flowers-radiation-science/
So if DUers are experiencing the mutated daisies in their backyard they might suspect toxic chemicals, endocrine disrupters like ROUNDUP READY HERBICIDE, or toxic fertilizers with hazardous waste. But probably most DUers haven't a clue that toxic waste is routinely put into fertilizers.
I respect friend Duff Wilson who was nomiated for a Pulitzer Prize for his courageous series of articles at the Seattle Times on highly toxic fertilizer containing recycled hazardous wastes:
http://archives.seattletimes.nwsource.com/cgi-bin/texis.cgi/web/vortex/display?slug=2547772&date=19970703&query=Fear+in+the+Fields