The response of female boll weevils to males, Anthonomus grandis Boheman, in laboratory bioassays can be reproduced by exposure to a mixture of compounds I, II, and either III or IV, all isolated from male weevils and their fecal material. The same response was elicited by mixtures of tile synthesized coimpounds. Compound I is (+)-cis-2-isopropenyl-l-methylcyclobtutaneethanol; II, cis-3,3-dimethiyl->(1,beta)cyclohexaneethanol; III, cis-3,3-dimethlyl->(1,alpha)-cyclohexaneacetaldehyde; and IV, trans-3,3-dimethyl->(1,alpha)-cyclohexanecetaldehyde.

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Maysin [2"-O-cu-~-rhamn~yl-6-C-(6-deoxy-xylo-hexos-4-ulosyl)luteolinl, the resistance factor of Zapalote Chico corn (Zea mays L.) silks to the corn earworm (Helicouerpa zea Boddie), was determined by HPLC in the silks of over 600 inbreds, populations, plant introductions (PI), and various unassigned collections. Maysin levels ranged from 0% to 0.9% fresh weight with approximately 19% of both the inbreds and populations containing maysin levels above 0.2 % , a level considered to be necessary for resistance, as based on the laboratory bioassay determined level (for larval) of maysin toxicity. Over 25 lines yielded higher silk maysin than found in Zapalote Chico (0.347%). High levels of 2"-O-cu-~-rhamnosyl-6-C-(6-deoxy-xylo-hexos-4-ulosy1)apigenin (apimaysin) were found in inbred NC7, while Tx501 contained appreciable amounts of 2"-O-~-~-rhamnosyl-6-C-(6-deoxy-xylo-hexos-4-ulosyl)-3~-methoxyluteolin (3/-methoxymaysin). Spectral data (13C NMR and FAB-MS) are given for the characterization of maysin, apimaysin, and 3'-methoxymaysin.