My herb garden was taken over by white grubs. They very neatly chewed the chives completely from the roots and then moved onto the mint, oregano and parsley. This was very disappointing because the chives and mint had been with me for 5 seasons. At this point do I discard all the soil and start over? Or do I spend invest $30 for 20 Million Beneficial Nematodes (H.bacteriophora) - Nema Globe Grub Buster for Pest on Amazon? My herb garden is very small (3' x 3") so I'm hesitant to spend $30 for this small space.

Putting in some of " these to test... "

What happen's when I put some apostrophe's in here

What would make my bush go from wine colored to light green? So upsetting! 

I have found this pure white growth only at the base of two red oak trees (out of many) on my property. It appears to be a fungus growing only and entirely around the base of the tree, and a bit on the ground surrounding the tree. Is this a harmful fungus for the tree? What is it, and should I attempt to kill it?