Abstract
The influence of nitrogen fertilization on host plant selection among grasses by the grasshopper Phoetaliotes nebrascensis Thomas was examined in the laboratory. Grasses used in the study are normally found in natural P. nebrascensis diets. Clear preferences among grass species were observed. Nitrogen fertilization resulted in decreased feeding on Andropogon hallii Hack, and possibly increased feeding on A. scoparius Michx. within grassspecies trials. No significant differences in amounts eaten between high- and low-N fertilization treatments were observed in tests with the other grass species. Preference rankings among grass species by P. nebrascensis were somewhat altered because of the influence of fertilization on Agropyron smithii Rydb. However, nonfertilized A. smithii ranks higher than fertilized plants. In general, N fertilization did not clearly affect selection among grass species, although some unique responses were observed.
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