Cowpea weevil

Females of the cowpea weevil, Callosobruchus maculatus, release a male attracting pheromone from the tip of their abdomen. The volatile signal contains five unsaturated, branched C8-acids 208-212 [376,377]. Individual compounds proved to be active while mixtures showed additive effects. Similarly, compounds 208 and 209 have been identified as the female produced sex pheromone of C. subinnotatus [378], while 209 had been described as the sex pheromone of C. analis [379]. However, GC-MS analyses of female produced volatiles of C. analis failed to detect any of the C. maculatus compounds, but did find an unidentified C8-acid with a retention time different from any of the C. maculatus acids [377]. 

Vigna unguiculate Seed coats Proanthocyanins Resistance to cowpea weevil Callosobruchus maculatus 364... 

PEDRA, J.H., BRANDT, A., WESTERMAN, R., LOBO, N., LI, H.M., ROMERO-SEVERSON, J., MURDOCK, L.L., PITTENDRIGH, B.R., Transcriptome analysis of the cowpea weevil bruchid identification of putative proteinases and alpha-amylases associated with food breakdown, Insect Molec. Biol, 2003,12, 405-412. 

Dose-mortality studies with constituents of lyophilized lemon oil demonstrated notable toxicity to the adult cowpea weevil, Callosobruchus maculatua. The of the oil was 16.4 pg/insect. 

Giga, P. P. and Smith, R. H. (1981) Varietal resistance and intraspecific competition in the cowpea weevils Callosobruchusmaculatusand C. chinensis. J. Appl. Ecol., 18,755-61. 

Wasserman, S. S. (1981) Host-induced oviposition preferences and oviposition markers in the cowpea weevil, Callosobruchus maculatus. Ann. ent. Soc. Am., 74, 242-5. 

Figure 5. Synthesis of the cowpea weevil pheromone blend (31, 32, 33).

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