Response of Schizaphis graminum (Homoptera: Aphididae) to Drought-Stressed Wheat, Using Polyethylene Glycol as a Matricum1

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Abstract
A method was developed for precisely controlling moisture stress in studying aphidhost plant relations. Wheat was grown hydroponically and stressed, using polyethylene glycol as a matricum. Little difference occurred between treatments of 0 megapascals (MPa) (control) and a - 0.38- MPa treatment for greenbug fecundity, longevity, reproductive period, and progeny produced per reproductive day. A sharp decline in all responses occurred at the −0.75- and −1.13-MPa treatments; however, only slight differences occurred between these. These results suggest that a critical moisture level occurs, below which greenbug fecundity and longevity are sharply reduced. This level may be important in breeding drought-resistant wheat.

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