Interesting. I know they can help control flea population in your yard, too, at least those sold as "beneficial nematodes". Anything that starts it's life cycle in the ground. I learned of that, while searching for something to help my doggy, who can't be exposed to the poisons in common flea preventatives, due to a previous immune system disorder.
Wondering about crickets. Hate crickets.
what you might be able to do is take cultures of soil or nematodes from another location and with the help of agar plates and e.coli or even some cricket right off the bat you could select out and reproduce nematodes that would eat crickets. if those nematodes can be reproduced with agar and bacteria until you have high numbers to release upon crickets that might work :/
for a home enviroment with steady atmospher this might stand a better chance (roaches).
good luck! \o
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