GENETIC DETERMINISM OF RESISTANCE TO THE GREEN APHID (MYZUS-PERSICAE)IN THE PEACH - FURTHER RESULTS

The mode of heredity of resistance to Myzus persicae was established i n the peach using a resistant parent S2678:47 and a susceptible parent S1161:12. This resistance follows a simple genetic determinism: it is dominant and monogenic (Symbols Rm1, rm1). No link was found between the locus determining aphid resistance and the loci determining weepin g shape (Pl, pl), corky triangle (T, t), flower shape (Sh, sh), and fr uit flesh colour (Y, y). Aphid resistance was maintained over 4 consec utive generations and has not been overcome yet. This study is part of a breeding programme to create varieties resistant to Myzus persicae.