It won't be just the pillbugs, but millipedes as well. But, in my experience, only if you leave the melons laying on moist soil. Slide a piece of plywood, or whatever you have handy, under your melons that will keep them from contacting the ground. Keep them high and dry and you will get by.

The roly polys also like to eat freshly sprouted tender seedlings. That's why I have to start everything in pots so the seedlings are big enough to withstand their attacks by the time I replant them into the garden.

I use Sluggo, and they've released a new organic version:
Monterey Sluggo Plus® Approved for Organic Gardening

If you like Sluggo®, youÂre going to love Sluggo Plus®! Controls snails and slugs, earwigs, sow bugs, pillbugs, and cutworms. Can be used on ornamentals, vegetables, fruit trees, berries, turf, and non-commercial greenhouses.

Pillbugs / rolly pollys decimated my peas and tender sprouts for two years. Contrary to the naysayers, it WAS pillbugs because I caught them in the act every night and early morning. I tried diatomaceous earth (they crawled right through it), cardboard rings around sprouts (they dug under them), rolled up wet newspaper (didn’t catch enough), oil/soy sauce/beer/you-name-it traps (didn’t catch enough). I honestly considered giving up planting the tender stuff.

After two years of failure, in year 3, I have organically won the battle with the pillbugs in my garden!! I am so elated I’m posting this on every pillbug garden thread I can find! This battle takes commitment. I recommend prepping your garden beds, and a week before setting out plants, go to war. (Or plant your seeds and immediately go to war!) Wet down the soil and about every 2 feet, place pieces of citrus peel (grapefruit or orange), or you can just cut up the fruit. Wait until it’s been dark a few hours. Bring a bucket of soapy water and a headlamp or flashlight with you. CAREFULLY pick up each piece of peel and shake it over the bucket. Tap it to make sure all bugs fall off. The tiny ones really dig in and hang on! There will also be many that stayed in the dirt where the fruit was. Quickly scoop them up and dump them in the bucket too. The first night I did this, I filled my bucket to a 1/2” deep of bugs! Just left them there overnight until they were dead, and dumped everything back in the dirt away from the garden. I kept this up every night for a week, and now just check about once a week. I rarely find large ones anymore, just the teeny tiny ones. I have raised beds and the bugs hide along the edges during the day. I keep pieces of peel around the inside edges and if they are going to eat, they choose the fruit over the sprouts. You’ll need to replace the peels when they begin to dry out.

Pillbugs are communal. I noticed pencil eraser sized holes around the edges against the wood. After digging, dozens big and small came out of the spot. If you notice these holes, place peel near them and the bugs won’t wander so far to eat (and potentially happen upon your plants).

My peas and lettuces are growing beautifully and barely a nibble has been taken out of them!

Lastly, I’ve read of many people that hand pick and throw the pillbugs into the compost heap. I would NEVER do this! It’s basically giving them a buffet to breed in. When you add that compost to your garden, you’re inadvertently adding these pests back in. Happy growing!