Abstract
Cucumis seedlings were screened in the laboratory to discover plant introductions and U. S. cultivars for use in breeding crops resistant to the melon aphid, Aphis gossypii Glover. Gerkin, Cucumis anguria L., (PI 147065), and cantaloupe, C. melo L., (PI 164320), were resistant in the laboratory and in subsequent field tests. C. metuliferus Naud. (PI 292190 and PI 202681) were highly resistant in the laboratory. Introductions in several other Cucumis species appeared resistant in screening. In laboratory tests, both alate and apterous melon aphids congregated on plants of susceptible C. melo varieties, but not on resistant PI 164320. Resistance was dominant in crosses of resistant PI 164320 with 2 other cantaloupe lines, PI 314654 and Honey Dew. Subsequent generations showed segregation resembling that observed in situations involving a small number of genes. However, attempts to fit the data to simple Mendelian models failed. Introductions of Cucumis anguria and its close relatives from Ethiopia and Arabia had a higher average resistance than introductions from southern Africa.
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