Nematode application

Hi,

I've recently purchased a pack of nematodes, to kill off the leatherjackets destroying my lawn.

My question is, rather than go through the rigmarole of using a watering can to do small sections of my lawn at a time, is it safe to use the dosing bottle attachment of my pressure washer to do the lot, or will that kill the poor little critters?

Suffice to say, I don't own a hose-end feeder and the water pressure from the PW dosing bottle is nowhere near as high as the regular PW attachments.

Cheers