Bah. I forgot to explain something else, that's very important: How I successfully germinated Ipomoea pandurata! When I picked seeds in mid-winter the first time, I didn't know about the beetles. None of the seeds I planted germinated. When I picked seeds in mid-winter the next time, I knew about the beetles, and kept the seeds frozen in my freezer. Around March, I think, I unfroze some of them... filed a portion of the hard seed coat off... and then soaked them in warm water over night. The seeds swelled up, and I planted them in pots. They germinated readily! And so... I think the trick with this technique was that the beetles never had enough time to hatch and damage the seed embryo. No, I didn't successfully raise the plants to maturity but I think that was due to starting them indoors too soon... having inadequate lighting... and so on. In future, I'll direct sow them outside in April or May. If other PBSers followed a similar technique, it would likewise prevent the eggs from hatching. So..... anyway. Just more info to digest & consider. I'm eager to hear feedback.