My lawn is trashed. Crows come and pull up tufts of grass leaving virtually nothing behind. The lawn is not healthy in the first place...more crabgrass than anything else on sandy, stony soil. I suspect the crows are going after the Japanese Beetle grubs. Assuming I do not have more than 10 grubs per square foot, can I do something to deter the crows? If I do have more than an acceptable amount of grubs, I will treat them based on other posts here at the forum. Thanks!