Not unless they color code the seeds. If you don't want to use insecticides, floating row covers and hand pollination are your best options.

Agree with the above. That is the problem with using those mixed packets and why most won't buy them - no way to tell which is which. All you can do is try to use any that look any different at all from the others and then cross your fingers.

Dave

The larger problem is the varying size of the plants. While all are buh types Pic n Pic is early and compact, The scallops are larger, but pretty well behaved. Black beauty is larger but tyical for a zuke, Ronde de Nice/Tonda di Nizza is twice the size of the the others and tends to sprawl.
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Thanks Farmer Dill! Do you happen to know once the seeds sprout, can I tell from the little plants which one is Ronde de Nice? Will the Ronde de Nice plant be larger from the get go? Or will the leaves be different shades? Ronde de Nice seems to have slightly silverish leaves?

Silver veined leaves will be Black Beauty. Ronde de Nice will be slower to blossom (longest DTM of varieties in question)

I read that transplants have a better chance of withstanding SVB. I plan to start my seeds in pots this year and replant them into the garden when they are big enough. I lost my squash last year to those nasty bugs..