Abstract
Abstract Greenhouse and field tests showed casaba melon, (Cucumis melo L. cv. Deserta Naja) to be highly susceptible to the western spotted cucumber beetle (Diabrotica undecimpunctata ssp. undecimpunctata Mannerheim). F1 and F2 progenies derived from a cross between ‘Deserta Naja’ and a comparatively resistant melon aphid-resistant breeding line ‘Top-Mark’ were nearly as susceptible as ‘Deserta Naja’, indicating a dominance of susceptibility. The mean damage to the progeny was significantly different from that of ‘Deserta Naja’; however, this indicated that dominance was incomplete. Greater numbers of the beetles on ‘Deserta Naja’ than on other entries in a field trial indicated that preference is associated with its high susceptibility. Differential damage to ‘Top-Mark’ in free-choice and no-choice tests supported the theory that resistance includes non-preference.
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