Homesteading Disasters (Or I've Been Weeviled)

So, some of you may remember a post where I talked about dehydrating blueberries,  and despite going way longer than the dehydrator instructions, I wasn't completely convinced they were dry. I had a great suggestion to put the dried blues in the freezer, in case they weren't 100% dry. But, sadly, by the time we got home from California, they had already started to mold. This almost brought tears to my eyes. Luckily though, since this was my first time using a dehydrator, I envisioned that something like this might happen. So I only dried about a pint of the blues and either froze or ate the rest fresh. So, at least I didn't lose my whole harvest and next time I will know that they need to go longer. Much longer.
In other garden news, in August I posted about saving seeds from my pea plants. Well, yesterday I decided to check in on them and this is what I found:

Ewww, right? With a quick google search I found out that they are cowpea weevils, a type of beetle that eats pea seeds. Awesome. I guess I will be buying my pea seeds next year. They are pretty fascinating though, because you can see the holes where they ate their way out of the seed. My question is how the heck do I prevent the weevils from getting into my seeds? And was I eating them when I ate my fresh snap peas? Yikes. Anyone have any experience with these pesky guys? I am obviously going to toss these seeds, but I would like to be able to save (pest-free seeds) in the future. What am I doing wrong?