Posted: 24/02/2015 at 22:45
Nematodes work in the damp warm ground/soil.
The snails only work over the top of the soil. That is why they are not so affective with snails, but they do pick them up in their travels.
This is why I like to spray the sludge through a fine membrane, Above the soil and try to get into all the corners, especially when it is wet for a few days.