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Physiological Changes in Barley Induced by Greenbug Feeding Stress^1,3,

Quantitative amounts of greenbug (Schizaphis graminum Rondani) feeding stress on the first foliar leaf of barley (Hordeum vulgare L.) caused a severe detrimental decline in chlorophyll content and in the rate of photosynthesis. The stress produced an increase in the rate of respiration but no change in leaf area, fresh weight, or dry weight during 7 days of controlled infestation.

Key Words: Plant stress • Photosynthesis • Respiration • Schizapis graminum Rondani • Hordeum vulgare L.

³ Mention of a trademark or proprietary product does not constitute a guarantee or warranty of the product by the U.S. Department of Agriculture and does not imply its approval to the exclusion of other products that may also be suitable.

² Plant Physiologist, Crops Research Division, and Entomologist, Entomology Research Division, Agricultural Research Service, U.S. Department of Agriculture, Brookings, S. D., respectively.

Received for publication December 22, 1969.