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The effects of the aphids Schizaphis graminum (Rondani) and Rhopalosiphum padi L. infestation on freezing tolerance of barley cv. Aramir and Atlas were studied. Seven day-old plants were infested with two aphids each. After 6 d, the freezing tolerance of the leaves was determined. Non infested leaves of cv. Atlas were significantly more tolerant than leaves of cv. Aramir (LT 50 = −6.65 and...
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