Summary
Simple methods of selection for resistance to Sappaphis devecta (Wlk.), the rosy leaf-curling aphid, are described. Cox's Orange Pippin was shown to carry a single dominant resistance gene, for which the symbol Sd is suggested. There was clear evidence that the apple varieties James Grieve, Northern Spy and Ashmead's Kernel also provide monogenic sources of resistance, and there were similar indications for Gascoyne's Scarlet and ST 14/20.
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References
Briggs, J. B., 1959. Methods for assessing resistance to Amphorophora rubi (Kalt.) in the raspberry. Rep. E. Malling Res. Stn. for 1958: 121–126.
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Sokolov, A. M., 1965. Resistance in apples to green and rosy leaf-curling aphids. 4th All-Union Conf. on immunity of agricultural plants (vines and fruit crops). Kišinev pp. 149–155 (In Russian).
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Alston, F.H., Briggs, J.B. Resistance to Sappaphis devecta (Wlk.) in apple. Euphytica 17, 468–472 (1968). https://doi.org/10.1007/BF00056249
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DOI: https://doi.org/10.1007/BF00056249