Soybean Aphid 2010 Early Prediction for Ohio

December 2, 2009 at 8:30 am

The below article is reblogged from an article written by Hammond et al for the CORN newsletter.

Soybean aphids did become a problem in parts of Ohio as predicted, with the worst problems being in the northeast counties and a few locations long Lake Erie. We also saw large, near economic populations in southern Ohio, especially along the Ohio River. We would mention that similar populations were observed in parts of Kentucky, southern Indiana, and southern Illinois.

The large flights of aphids seen in an outbreak year were much later than expected, more into mid-to-late August.  These late flights resulted in extremely large populations of aphids on buckthorn, the aphid’s overwintering host.  Although we expected to see large egg numbers on buckthorn, this did not happen. It appeared that a fungal pathogen infected the aphid population causing significant mortality. It was not unusual to see large numbers of brown, dead unwinged aphids along with winged aphids that seemed to “melt” on the leaf surfaces. Subsequently, we have observed very few eggs on the buckthorn this fall as we had projected.

What does this mean for Ohio in 2010? At this time, we have to admit we do not know. Normally when we see late flights and large numbers of aphids on buckthorn, we predict that we will see significant problems the following summer. But the large mortality we observed with the corresponding lack of egg deposition questions that assumption.  We recommend that growers maintain extra vigilance next summer until we see trends in what the soybean aphid population is doing. We would remind growers that the OSU Extension C.O.R.N. newsletter will be the best source of information during the summer months of 2010.

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