OK, so I guess I am not the only one that didn't know what the upside down half-grapefruit trick to catch pillbugs was! I learned it from my organic-gardening neighbor. Here it is:
Step 1: Acquire a tasty Grapefruit, cut it in half, and consume it - Yum!
Step 2: Scoop out the insides so as to make an upside down dome and drink the juice -Yum, again!
Step 3: Place said scooped and dome-ized half grapefruit shell upside down on the ground in the garden near where the pillbugs attack
Pillbugs are Isopods and breathe with gills; they are therefore restricted to areas with high humidity, under rocks or logs, in leaf litter or in crevices or UNDER that half-grapefruit you just put in the garden.
Step 4: Go out in the morning and look under the grapefruit and you will find PILES of these little buggers all snuggled up underneath it. Shake them out into a bucket of water and drown them - they can't live under water for long! Just make sure you change out that bucket of water every day or two though, because dead pillbugs get STINKY quickly! (I think they smell like rotten shrimp).
So there ya go. How to control pillbugs in the garden using an upside down grapefruit. I actually put out about 6-8 of the halved grapefruits in a row to help solve my pillbug problem. It worked pretty darn well, I tell you what!