| Sumario: | The effect of aviruliferous aphids M. dirhodum, R. padi and S. avenae on the chemical composition of root and aerial parts was tested on Triticum aestivum cv. "Express" sown in pots,
Wheat plants were infested with first thstar aphids in numbers of three, ten and thirty by ark, at the stages 2-3, 5-6 and 8-9 Feekes scale respectively, The aphids were killed when the plants were at stages 10.1 to 10.5 of scale.
Aphids affected significantly the total quantity of P and Na present in the root. R. padi in addition affected significantly the quantity of P in the aerial parts, but the other species did not. The total and relative quantity of N, Ca, K and Mg and the relative quantity of Na and P in both parts was not affected significantly.
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