[lathyrus_long]

I've heard of facilities with short crop cycles (greens, herbs, etc.) running totally bug-free with zero pesticides, with air showers at the entrance and careful segregation so that one introduction doesn't ruin their whole crop, etc. I don't think that's common, though.

There's usually bugs. It's common to deliberately introduce predatory insects, which control the pests in the same way as in nature, with the additional benefit that they can't fly away if the pest population gets too low. Chemical pesticides are also widely used, both organic and non-organic.

Hydroponic crops are especially vulnerable to sucking pests (aphids, whiteflies, etc.), because of the large amounts of tender new growth. Without controls or natural predators, their population can just explode, much worse than anything you'd get outdoors.