Posts tagged ‘soybean aphid’

Soybean Aphid 2010 Early Prediction for Ohio

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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December 2, 2009 at 8:30 am

Soybean Aphid Update

In this week’s CORN Newsletter, OSU Entomologists Hammond, Michel and Eisley give a soybean aphid update. There is a general lack of sobyean aphids in Ohio. Further, I have yet to find any soybean aphids in Van Wert County. From the CORN Newsletter:

Last week we had the opportunity to check or get reports from numerous fields throughout Ohio on the situation with soybean aphids, and in general, the reports were about the relative lack of soybean aphids. However, late in the week, we got a report from Geauga County in northeast Ohio about fields having higher populations. A visit to that area this weekend supported those findings. We found numerous soybean fields that are nearly 100% infested. Numbers of soybean aphids per plant were not yet high, but nearly all plants had aphids, ranging from a few to 10-15 per plant. It was difficult to find a plant without aphids. Many of the soybeans in that area were later planted and are just now in growth stage R2. The Extension Educator from Geauga County, Les Ober, said that he is aware of one field that while not yet at threshold, will probably be within a week if the aphid population continues to grow. Thus, we would remind growers that we are not out of the woods yet when it comes to aphids. This is especially true for growers in north central and northeast OH, who should make an extra effort to sample their soybeans. If, and it is a big if, aphid populations starting doubling, these fields could be reaching threshold within next 1-2 weeks.

Full podcast here:

August 5, 2009 at 8:15 am

Difficult to Predict Soybean Aphid for 2009

Ron Hammond, OSU Extension Entomologist, recently discussed predictions for 2009 soybean aphid infestations. Spoiler alert: there is no prediction. Read on if you want the details.

The soybean aphid in 2008 held true with its trend of every other year infestations. Since we first found aphid in Ohio several years ago, soybean aphid has been predictable in a way that led us to classify it as a threat every other year. With the exception of a few areas in northern Indiana, the soybean aphid has behaved as predicted in Ohio for 2008 with very few infestations and not much justification to spray an insecticide.

The question is now what can we expect for soybean aphids in 2009? If the soybean aphid is true to its infestation pattern, then 2009 should be a year with heavy soybean aphid infestations and need for soybean insecticide applications. But OSU researchers such as Dr. Hammond are suggesting that the soybean aphid may not be a problem again in 2009. The data on predicting soybean aphid is contradictory right now.

On one hand, aphid numbers went up in the fall months as expected. These higher fall collections are the initial sign of something brewing for the following summer. However, there was almost a total lack of aphid colonies on buckthorn (the plant that aphids overwinter) in Ohio during September and October, and we have yet to find our first egg. In past years, OSU Entomologists have always found aphid colonies and eggs in the fall after a low-aphid summer, and preceding a high year. Thus, it is difficult to offer a prediction of what will happen in 2009.

At this time, I recommend reading the C.O.R.N. newsletter closely next spring and summer to see what is, or is not, happening. In fact, I recommend you subscribe to the C.O.R.N. newsletter so that you can receive weekly email updates. By following aphid development to our north, we hope to be able to give growers at least a few weeks notice if something might occur. This notice will be announced immediately through the C.O.R.N. newsletter. It is important to stay abreast of soybean aphid populations during the summer. During the summer, the soybean aphid can reportedly complete 15 generations a season, with populations doubling in just a few days. Subscribe to the C.O.R.N. newsletter here. If you prefer not to subscribe, you can visit the website weekly at http://corn.osu.edu/

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November 26, 2008 at 7:00 am


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