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History of the Alfalfa Weevil, Hypera postica (Gyll.) (Coleoptera: Curculionidae), in Alberta

  • G. A. Hobbs (a1), W. O. Nummi (a1) and J. F. Virostek (a1)

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In June, 1954, the alfalfa weevil, Hypera postica (Gyll.), was found in very small numbers (one per 500 sweeps) in alfalfa fields in the valley of the Milk River and in the area between the hamlets of Onefour and Orion in southeastern Alberta. These were the first records of its occurrence in Canada. As the host-specific parasite Bathyplectes curculionis (Thoms.) (Townes and Townes, 1951) emerged from some of the weevil larvae collected then, the weevil had been in Alberta for at least one year. On July 26 an intensive search was made in the irrigated areas around Lethbridge. Only two weevils were taken in approximately 25,000 sweeps from 25 fields. The distribution of the weevil at this time indicated that it had migrated from the irrigated areas of Montana that lie along the lower reaches of the Milk River by way of the river valley.

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References

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Hamlin, J. C., Lieberman, F. V., Bunn, R. W., McDuffie, W. C., Newton, R. C., and Jones, L. J.. Field studies of the alfalfa weevil and its environment. U.S. Dept. Agr. Tech. Bull. 975. 1949.
Hamlin, J. C., McDuffie, W. C., and Lieberman, F. V.. Alfalfa weevil distribution and crop damage in the United States. U.S. Dept. Agr. Circ. 815. 1949.
Hastings, E., and Pepper, J. H.. Field tests with new insecticides for control of the alfalfa weevil, J. Econ. Ent. 42: 554555. 1949.
Hastings, E., and Pepper, J. H.. Further contributions to alfalfa weevil studies. J. Econ. Ent. 46: 785788. 1953.
Pepper, J. H.Thirty-fourth report of the State Entomologist. Montana State Coll. Agr. Expt. Sta. Bull. 484. 1953.
Pepper, J. H.Thirty-fifth report of the State Entomologist. Montana State Coll. Agr. Expt. Sta. Bull. 504. 1954.
Townes, H. K., and Townes, M.. Family Ichneumonidae. In Hymenoptera of America north of Mexico. Synoptic catalog, by Muesebeck, C. F. W., Krombein, K. V., Townes, H. K., and others, pp. 184409, U.S. Dept. Agr., Agr. Monogr. 2. 1951.

History of the Alfalfa Weevil, Hypera postica (Gyll.) (Coleoptera: Curculionidae), in Alberta

  • G. A. Hobbs (a1), W. O. Nummi (a1) and J. F. Virostek (a1)

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