1. Soybean aphid suction trap. 2004 Illinois suction trap locations. Nine sites, one trap per location. Dr. David Voegtlin Univ. of Illinois IL Natural History Survey Can we anticipate high soybean aphid years?

2. Eggs Summer population Spring Fall Migrants SOYBEAN BUCKTHORN Chris DiFonzo, MSU Entomology Department

3. Soybean aphid eggs overwinter on Buckthorn Soybean aphid eggs on Buckthorn Photo by D. Voegtlin Sept. – Oct. Trap Catch: Winged migrants (female & male) Moving from soybean to buckthorn. Size and success of this migration can influence population the following season.

4. Free. DeK. Mon. Urbana Perry Brown. Dixon Spr. 27 July82561200 3 August149 5550500 10 August88626221010 17 August322130101 24 August2000010 31 August0100000 7 Sept.0000000 14 Sept.0000000 21 Sept.5003000 28 Sept.3140000 5 Oct.2200030 12 Oct.0000001 Illinois Suction Traps - 2001 David Voegtlin, U of Ill Natural History Survey

5. Free. DeK. Mon. Urbana Perry Brown. Dixon Spr. 19 July3030400 26 July33100000 2 August41 566000 9 August131980500 16 August228021000 23 August0400210 30 August0000100 6 Sept.0100000 13 Sept.0030000 20 Sept.00170200 27 Sept.02807128410 4 Oct.038621313310 11 Oct.0734900 Illinois Suction Traps - 2002 David Voegtlin, U of Ill Natural History Survey

6. Free. DeK. Mon. Eur. Urbana Perry Brown. D. Spr. 4 July00000000 11July211000000 18 July176131120000 25 July112940591422431 1 August787 6,755714019810 8 August1,9124,8905694,920163232180 15 August1,8102861,4031,0906021,5601,53531 22 August1,3472642,6909211,1316204,1132 29 August262920950215851,06067 5 Sept.138263251 12 Sept.00000000 19 Sept.00110000 26 Sept.00000000 3 Oct.00000000 10 Oct.00030200 17 Oct.0005n.s.154 Illinois Suction Traps - 2003 David Voegtlin, U of Ill Natural History Survey

7. Free. DeK. Jol. Mon. Eur. Urbana Perry Brown. D. Spr. 30 July1 0 1 1 4 0000 6 August1 1 1 0 3 0100 13 August1 0 0 1 1 0400 20 August1 0 0 0 2 010 0 27August0 1 1 1 1 0000 3 Sept.0 0 0 4 2 0610 10 Sept. 3 2 0 1915 3 1200 17 Sept. 39 20 0 78 105 6 357 11 0 24 Sept. 83 26 6 16 48 7 164 41 3 1 Oct. 13 20 3 25 132 32 289 76 8 Oct. 13 4 - 2 19 3 48 15 5 15 Oct. 0 4 4 0 5 4 25 2 4 22 Oct. - - 0 0 1 - - - 3 Illinois Suction Traps - 2004 David Voegtlin, U of Ill Natural History Survey

8. Illinois Suction Trap Trends Eileen Cullen – UW Extension, Entomology Fall 2001 Trap Catches Very Low 2002 Growing Season low soybean aphid year Fall 2002 Traps caught 700+ migrants 2003 Growing Season high soybean aphid year Fall 2003 Trap Catches again Very Low 2004 Growing Season very low soybean aphid year Fall 2004 Traps caught 1,765 migrants 2005 Growing Season ???? Scouting will be Critical.