Jacqueline said:

I'm planning on applying beneficial nematodes to protect the veggie beds in
the back yard, but am not sure how much I need. Do I need enough to cover
the whole yard (1/2 acre), just the back yard (about 1/8 acre), or only the
area around my sfg beds?

Use it where the plants you are interesting in protecting are. If you are concerned
about Japanese beetle grubs, you might use them in the entire lawn and garden
(which could get expensive). If you are mostly worried about insects in the
veggie garden, use them there.
--
Pat in Plymouth MI ('someplace.net' is comcast)

Any technology distinguishable from magic is insufficiently advanced.
(attributed to Don Marti)