my hostas all have holes and tunnels chewed out of the stems- then the stems...
my hostas all have holes and tunnels chewed out of the stems- then the stems collapse- looks like borers- not slug damage- some have suggested Eight and others a systemic- I have dug out and tossed hundreds of hosta plants and only kept my favorites- have cut them down to cple inches and sprayed thoroughly with Eight- do I also treat with a systemic?
Olmsted County Minnesota
This is not a common occurrence in Minnesota, however, here is a link to more information. http://ipm.ncsu.edu/AG271/corn_sorghum/stalk_borer.html
Since the borers are inside the stems the only way to get a pesticide to them is to use a systemic.