I was wondering if there is a herbicide you could recommend to use to kill any potential weeds where I plant potatoes and corn? Either before planting or after the corn and potatoes start to emerge.  I till my soil twice before planting. After planting I use a rototiller or hoe to get at the weeds. Last year I was gone for a couple trips and when I got back home the weeds had taken over and I couldn't get them under control.  Thank you Kurt