Tetraploid induction/Trifluralin

[vanamoinen1]

Since colchicine is difficult to obtain and can be dangerous to handle, I've been trying to find suitable methods for inducing the conversion of plants from diploid to tetraploid using other agents. The one which looks most promising is trifluralin although this has its own risks. I note that it is commonly used as a pre-emergent herbicide--think Preen--but it has also been found to induce tetraploidy in Hemerocallis (daylily). Any known protocols for using this compound? Safety is important as is the actual success rate using this compound. Would be most appreciative of advice for using trifluralin or other similarly-obtainable compounds.