Following up what Hazelnut said, which So. Cal. county are you in? The UC overall coop website says they can't advise on specific pest situations, and refer people to the
county extension offices:
http://ucanr.org/County_Office...
here are some links to the overall UC Coop Extension program:
UC Cooperative Extension | Agricultural Experiment Station
http://ucanr.edu/
Most of the UC site describes pest management
by crop, not by pest. But here are some links within their environmentally sound, Integrated Pest Management area:
http://www.ipm.ucdavis.edu/ind...
UC IPM Online
Home, garden, turf, and landscape pests
http://www.ipm.ucdavis.edu/PMG...
UC IPM Online
Insects, mites, mollusks, nematodes
http://www.ipm.ucdavis.edu/PMG...
UC IPM Online
Beetles & grubs
http://www.ipm.ucdavis.edu/PMG...
UC IPM Online
Pest Management Guidelines: PDF files
Links to pest management sites:
http://www.ipm.ucdavis.edu/GEN...
Maybe email some photos to the Master Gardner organization to identify the exact variety of grub and beetle? How many 3-inch grubs can there BE?
