Wednesday, 20 November 2002
D0660

This presentation is part of : Display Presentations, Section F. Crop Protection Entomology

The effects of Rhopalosiphum padi L. on winter wheat forage yields and quality

Kristopher Giles1, Emad A. Ismail1, Dennis Kastl1, Robert M. Hunger1, Clinton Krehbiel2, Tom A. Royer1, and Norman C. Elliott3. (1) Oklahoma State University, Department of Entomology and Plant Pathology, 127 NRC, Stillwater, OK, (2) Oklahoma State University, Department of Animal Science, 208 AN SCI, Stillwater, OK, (3) USDA ARS, PSWCRL, 1301 N. Western, Stillwater, OK

A replicated field experiment was conducted to evaluate the effects of Rhopalosiphum padi L. on winter wheat forage yields and quality. Increasing aphid infestations caused reductions in forage yield (up to 14-fold), crude protein content (up to 28%), and digestibility (up to 35 %). However, little to no added effect was observed in plots infested with veliferous R. padi (Carrying Barley Yellow Dwarf Virus). Results of these studies raise very serious concerns for cattle producers regarding aphid control in wheat forage.

Species 1: Homoptera Aphididae Rhopalosiphum padi (bird cherry-oat aphid)
Keywords: economic threshold, forage

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