Abstract
The reaction of barley plants and greenbugs (Toxoptera graminum (Rondani)) to several plastic-sheet materials used as cages was investigated. The use of cellulose acetate and vinyl cages killed young barley plants in less than 10 days. These two materials had an adverse effect on greenbug development, reduced fecundity, and could not be used as cages in the greenbug resistance studies. Several other materials were not toxic. Of these, cellulose nitrate was the best suited for making cages.

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