New publication about where to find aphid resistant soybeans

Farmers interested in purchasing aphid resistant soybeans can learn more in a new publication from ISU.

Seed companies were surveyed in the fall of 2011 regarding the availability of aphid resistant varieties. Good news: aphid resistant soybean seed is available. Learn about what companies are selling these through this 4-page summary. Download it for free here.

(NOTE-This document was edited on March 29, 2012. In the original an NK Brand seed was miss-labelled S21-EF. It was corrected to NK Brand S21-Q3.)

Learn more about aphid-resistant soybeans

The availability of aphid-resistant soybeans is increasing, and so is the amount of information available to growers interested in this new tool for preventing yield loss from the soybean aphid. Drs. Hodgson and O'Neal describe the source of soybean aphid resistance and results from two years of field testing in a four page, color fact-sheet produced with the Iowa Soybean Association.

Soybean Aphid Podcasts added to

Beginning in July, we have added podcasts to our site. A new podcast will be posted once a week during the growing season. In these podcasts will be updates on the status of the soybean aphid and insights into its management from research at ISU.

Please note the comment section added to each podcasts as well as the link 'Contact Us' in the upper right hand corner. Each of these are ways for you to ask Dr. Hodgson and O'Neal questions about soybean aphids and soybean pest management. We will address these questions and comments in future podcasts.

Keep an Eye Out for Aphids

If you haven't started thinking about scouting your soybean fields for aphids yet, Marlin Rice, Iowa State University (ISU) Extension entomologist, urges you to get ready to start checking your fields by the end of June.

"Aphids often occur in soybeans in northeastern Iowa around mid June, but they are difficult to find, and infestations rarely reach the economic threshold of 250 aphids per plant during June. However, this year aphids were found earlier than expected in northeastern Iowa. Therefore, I recommend that producers start scouting the last week of June, or the first week of July at the very latest. Scouting can provide information on the presence of aphids and by scouting for several weeks, it can be determined whether the population is increasing or decreasing," he said.

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That Soybean Pest "Mite" Not Be An Aphid

The hot, dry weather conditions are increasing the need for producers to scout their fields. Reports to Iowa State University (ISU) crop specialists indicate infestations of spider mites in some Iowa soybean fields, as well as isolated fields with more than 250 soybean aphids per plant.

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Confirmation of aphid presence and weekly variation

Attached is a powerpoint presentation with data from Brian Lang and Matt O'Neal tracking aphid populations within thier soybean research plots. These data may not be representative of regional population trends.

Management Options for Soybean Aphids

If producers do need to treat for soybean aphids this year, two Iowa State University (ISU) entomologists have recommendations on when and how insecticides should be used to manage this pest.

"Do not use insecticides when small populations of soybean aphids are first found in the field," said Matt O'Neal, Iowa State University (ISU) assistant professor, soybean entomology. "Natural enemies can help suppress small aphid populations. Determine if the aphid population is increasing or decreasing."

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The Economics of Aphids Infestations

"Soybean aphid populations remain small throughout most of Iowa except for the northeastern corner of the state. A few fields in Winneshiek County have reached the economic threshold of 250 plants and will soon be sprayed,” said Marlin Rice, Iowa State University (ISU) Extension entomologist.

Field scouting should occur weekly until plants reach the beginning seed stage (R5) or the field is sprayed. When aphids are found, estimate the population size per plant. Count all the aphids on several leaves and plant terminal to establish what 100 or 250 aphids look like and then use this as a mental reference for gauging populations on other plants.

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2005 Soybean Aphid in Iowa Update

ISU Forms Aphid Team and Shares Research Results

Faculty and staff from Iowa State University (ISU) Extension, the ISU Department of Entomology, and the Iowa Soybean Association have formed the Iowa Soybean Aphid Task Force.

"The Task Force's intent is to proactively plan soybean aphid management strategies. The Task Force is collecting and synthesizing the latest research information and preparing it for rapid delivery through the Web page, publications, and grower meetings," says Jon Tollefson, the Task Force leader and chair of the Department of Entomology.

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