Screening of melon (Cucumis melo L.) germplasm for multiple disease resistance.
Some 72 melon genotypes were screened for cucumber green mottle mosaic tobamovirus (CGMMV), powdery mildew (Sphaerotheca fuliginea) and Fusarium wilt (Fusarium oxysporum f.sp. melonis) resistance under artificial conditions and for downy mildew (Pseudoperonospora cubensis) resistance under natural epiphytotic conditions. High level resistance to all 4 diseases was not recorded in any of the genotypes tested. Nevertheless, resistance to three diseases was observed in three genotypes: the wild Cucumis species C. figarei exhibited absolute resistance to CGMMV and Fusarium wilt and high level resistance to downy mildew; Phoot or snapmelon (C. melo var. momordica), a non-dessert form of Indian origin, was highly resistant to downy mildew, resistant to CGMMV and moderately resistant to Fusarium wilt; and Iroquois was resistant to powdery mildew and moderately resistant to downy mildew and CGMMV. The following genotypes showed resistance/tolerance to 2 diseases: C. zeyheri, PMR6, VRM7-12A, VRM1-3A, VRM1-3B, VRM5-10A and VRM5-10B.