Research conducted by SDSU Extension Entomology in Brookings and Clay counties on established (3- to 7-year-old) stands of alfalfa indicated reductions in percent crude protein by up to 4 percentage points on second cutting alfalfa if exposed to 1-5 potato leafhoppers per-sweep-of-an-insect-net. However, no reduction in yield (tonnage) was observed.

 

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