Question
My knockout rose leaves are turning brown and getting holes. We can not see any insects and have treated for insects.Need suggestions on what might be wrong.

Answer
Hello Lois,

The brown leaves could be the season. Roses in our area do not know if they need to grow or slow down in October.    Unless the entire bush is turning brown; then you might want to make sure moles and voles are not an issue under ground.  

If the holes are in the middle of the leaf, it could be slugs.  What did you spray the roses with?  

If the holes are on the edges, it is most likely grass hoppers.  They are everywhere this time of year and it takes alot of spray to get them under control.

Please ask back if you need more help.

Thanks,

Jay