Have always had a problem with both in our food plots but this year we had it in spades. Both are starting to turn yellow and feel sure, as in the past, both will wither and die with first frost - if we ever get one. Have over-seeded with both wheat and turnips in anticipation of a die off that would allow new germination. Would like to be a little more pro-active next year and try a pre-emergent if there is one that will help. Thoughts?