Aphid populations in 2005 and 2006
In 2005, Aphis glycines arrival in soybean was detected beginning in mid-June in Michigan, Minnesota, and Wisconsin. Soybean aphid was detected about one month later in the Iowa sites, beginning on 7 July
Of the 12 sites sampled, eight reached the economic threshold of 250 A. glycines per plant in the field as a whole. The date at which threshold was reached in the field at large varied from mid-July to late August (Table 1). Populations in exclusion cages exceeded threshold in 11 of 12 sites 11.6 days earlier, on average, than the open field. In 2006 soybean aphid was detected beginning in mid-June through mid-July in all sites except site 25 in Iowa, where aphids were not found until 10 August. Only two of the 14 sites reached threshold in the field at large, whereas in exclusion cages eight sites exceeded threshold
Aphid populations in 2005 and 2006In 2005, Aphis glycines arrival in soybean was detected beginning in mid-June in Michigan, Minnesota, and Wisconsin. Soybean aphid was detected about one month later in the Iowa sites, beginning on 7 JulyOf the 12 sites sampled, eight reached the economic threshold of 250 A. glycines per plant in the field as a whole. The date at which threshold was reached in the field at large varied from mid-July to late August (Table 1). Populations in exclusion cages exceeded threshold in 11 of 12 sites 11.6 days earlier, on average, than the open field. In 2006 soybean aphid was detected beginning in mid-June through mid-July in all sites except site 25 in Iowa, where aphids were not found until 10 August. Only two of the 14 sites reached threshold in the field at large, whereas in exclusion cages eight sites exceeded threshold
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