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Yield Reductions in Reed Canarygrass Caused by Frit Fly Infestation¹

Yields of reed canarygrass were reduced 0.52 metric ton per hectare in second harvest due to frit fly infestation. Plant height and weight of individual tillers were reduced by as much as one-half by infestation. Insect control resulted in aftermath yield increases of 32% in low nitrogen plots and 17% in high nitrogen plots. Infestation interrupted normal morphological and physiological development. It is proposed that residue left by the feeding larvae may influence forage acceptability of grazing animals.

Key Words: Phalaris arundinacea L. • Oscinella frit L. • animal acceptability

² Assistant Professor of Agronomy.

Received for publication October 17, 1966.