live in NYC and last week came to see the first picture in my backyard. Today I came and saw it got worse. The area is just grass with nothing underneath to attract digging. I havent seen any animal droppings either.

In another post someone said that I should use milky powder and that people in the lawn section could help more. Mily powder is expensive and only attacks one specific type of grubs. How do I know if thats what i need and not a more wide control? Plus I am trying to avoid killing everything with pesticides.

https://www.gardenweb.com/discussions/5501299/what-is-digging-up-my-backyard