Chemical treatment to try to induce seedling upshifts to 4N is fairly common. I have not heard of anyone using irradiation.
While there are some commercial growers in this forum, most members are hobby growers. Your question is better addressed directly to some of the larger hybridizers.
You can try:
Fred Clarke at Sunset Valley Orchids, CA
Alan Koch at Gold Coast Orchids, CA
Martin Motes of Motes Orchids, FL
Dave Off of Waldor Orchids, NJ
Ron Midgett of New Earth Orchids, NM
__________________
Kim (Fair Orchids)
Founder of SPCOP (Society to Prevention of Cruelty to Orchid People), with the goal of barring the taxonomists from tinkering with established genera!
I am neither a 'lumper' nor a 'splitter', but I refuse to re-write millions of labels.
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