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Population Dynamics of Soybean Aphid
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Soybean aphid poses a significant risk to soybean production because of its tremendous reproductive potential! In the summer, the population in soybean is comprised of females that essentially clone themselves. Females give birth to live young nymphs at a rate of 3-5 per day. These female nymphs mature in ca. 5 - 7 days and begin producing their own young. The result: an exponential growth rate where populations can double in 2-3 days under favorable conditions.
Population Growth of Soybean Aphid
An example of soybean aphid population growth is presented for a field near Houston, MN in 2001. The colonization of this field began when the soybean was fairly young (stage V1 to V2). In the next 3 to 4 weeks, nearly 100% of the plants were colonized. Once a majority of the soybean plants were colonized, densities began to increase dramatically. It took only 5 weeks to go from ca. 1 aphid per plant to over 5000 aphids per plant. Aphids began invading the young soybean (stage V1 – V2) in this fieThe tremendous population growth that results can be seen in aphid densities on soybean in southeast Minnesota during 2001. Aphids invading fields of young soybean (V1 – V2) took ca. 3-4 weeks to reach about 1 aphid per plant. In the next five weeks, aphid densities reached nearly 5000 per plant.
Population Growth of Soybean Aphid Houston, MN in 2001
Factors Influencing Population Dynamics in Soybean
Local Dispersal and Migration
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Potential Mortality Factors on Buckthorn
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URL: http://www.soybeans.umn.edu/crop/insects/aphid/aphid_population.htm
Last Modified 3/25/11 2:27 PM
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