Crippling in Yellow Cattleya Hybrids

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The June issue of ORCHIDS magazine carried an article by Ron Midgett, PhD, on crippling in yellow and art-shade Cattleya breeding. He offered that the believed cause then and now is C. dowiana var. rosita. Ken Roberts offers a different opinion in the August magazine in the "Letters" section up front. Speaking with a few noted growers of cattleyas, I was offered even other explanations. It would be interesting to hear what conclusions some of our readers might have reached!