I just dug up a corner of my yard were I am going to put some tomatoe plants. as I was digging and using my garden weasle, I came across alot of grubs, I read that they are the larvea of some beetle? is this correct? I honestly dont think the old lady that lived in this house did much lawn care in the 60 yrs she lived here. is there anything I can add to this bed that will rid of these gross things? lime? epsom salts?