Inheritance of resistance to lettuce infectious yellows virus in melon

Abstract

Lettuce infectious yellows virus (LIYV), transmitted by the sweetpotato whitefly, (Bemisia tabaci Genn.), seriously affected melon (Cucumis melo L.) production in the lower desert areas of the southwest United States from 1981 through 1990. Melon plant introduction (PI) 313970 was previously found resistant to LIYV in naturally infected field tests and controlled-inoculation greenhouse tests. Data from F1 and segregating generations from crosses of P1313970 with LIYV-susceptible lines indicated that resistance in this accession is conditioned by a dominant allele at a single locus designated Lettuce infectious yellows (Liy).