I have a problem with grasshoppers. They...

Row covers and screens can help protect the turnip greens. Tall grass provides food and shelter for the grasshoppers, so leaving the garden border unmowed will delay grasshopper movement into the garden. Also, a trap crop of attractive plants, such as zinnias or some other lush flower or vegetation, can be planted around the edge of the garden. The most effective grasshopper deterrent is chickens, but they may cause injury to other plants.