nematodes and garlic

I was looking into getting nematodes to control the massive slug population in my garden but someone told me that nematodes are disaster for garlic. As this is the thing I have planted most, I'd be worried that they'd get mangled.

Can anyone confirm that its safe to use something like nemasys and nemaslug around garlic please?

 

Why would it be a disaster for garlic???

ask the supplier, but I cant think it should be a problem