My winter squash (butternut) leaves are turning brown and wilting. I had the same problem with cucumbers and summer squash. On the winter squash I noticed alot of gray beetles. Is this what is killing the squash???? I don't recall if they were on the cucumbers & summer squash but I had to pull them up and discard them. The beetles do not have any other color, spots or stripes on them. Would appreciate any help. Thank you in advance.