A production rate of 32 locusts per person per 16-hour workday isn't enough to matter unless you have a small army of people rubbing grasshopper legs together all day, I'd think. Though it is a pretty funny image.
The grasshoppers self-activate as locusts under crowded conditions. Once they enter the swarming phase, the behaviour is self-perpetuating, generally until foid supplies are exhausted. With high mobility, this can take time and strip tremendous areas of land.
By stocking a sufficient population early on, in sufficient confinement,, it might be possible to create a perpetuating, expanding, swarm.
Looks like grasshoppers generally live 50ish days as an adult. That's gonna put some serious limits on your max per-grasshopper-leg-rubber total accumulated grasshoppers.
By stocking a sufficient population early on, in sufficient confinement,, it might be possible to create a perpetuating, expanding, swarm.