Start Date

2-12-1993 12:00 AM

Description

Hypera postica Gyllenhal (Coleoptera: Curculionidae) is an introduced insect pest from Central Asia, and was first discovered in the United States (Utah) in 1904 (Dysart & Day 1976). It was first reported in the Eastern U.S. in 1951, and in Iowa in 1967 (Armbrust et al. 1970, Stockdale 1967). H. postica increased dramatically in the absence of its native natural enemies, and caused widespread economic losses throughout the Eastern U.S. (Day 1981, Wintersteen 1992). In 1957, the USDA began importing and releasing parasitoid wasps to reduce weevil populations. These natural enemies reduced populations of H. postica and saved east coast alfalfa growers $8 million dollars each year in reduced insecticide use and alfalfa damage (Day 1981, Wintersteen 1992). In an economic analysis of the alfalfa weevil biological control program, Moffit et al. (1990) concluded that the benefits of this program for the entire U. S. are equivalent to $88 million dollars per year (1987 dollars).

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Dec 2nd, 12:00 AM

Impact of Alfalfa Weevil's Natural Enemies in Iowa

Hypera postica Gyllenhal (Coleoptera: Curculionidae) is an introduced insect pest from Central Asia, and was first discovered in the United States (Utah) in 1904 (Dysart & Day 1976). It was first reported in the Eastern U.S. in 1951, and in Iowa in 1967 (Armbrust et al. 1970, Stockdale 1967). H. postica increased dramatically in the absence of its native natural enemies, and caused widespread economic losses throughout the Eastern U.S. (Day 1981, Wintersteen 1992). In 1957, the USDA began importing and releasing parasitoid wasps to reduce weevil populations. These natural enemies reduced populations of H. postica and saved east coast alfalfa growers $8 million dollars each year in reduced insecticide use and alfalfa damage (Day 1981, Wintersteen 1992). In an economic analysis of the alfalfa weevil biological control program, Moffit et al. (1990) concluded that the benefits of this program for the entire U. S. are equivalent to $88 million dollars per year (1987 dollars).