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July 2010 Archive for Ask an Agronomist

RSS By: Farm Journal Agronomists, Farm Journal

Have your agronomic questions answered by a Farm Journal agronomist. E-mail us directly at TestPlots@FarmJournal.com, and we’ll respond on this blog to provide an interactive dialogue.

Speed Up The Scouting Process For Soybean Aphids

Jul 22, 2010
Question: A week ago (July 15) I hadn’t seen any soybean aphids. This past Monday, it was like they had exploded in one of my fields, so now I’m starting to check my other soybean fields. It’s slow going, help!
 
Answer: Sounds like you’re out scouting fields, which is the best thing you can do to stay on top of soybean aphid pressure between now and mid-August. The economic threshold for aphids is 250 aphids per plant. We use this threshold up until the later reproductive stages, around R4. Some research we’ve seen indicates there could be an economic benefit using this threshold through R5. You can use a simple speed counting process to determine whether you’ve reached threshold levels—it doesn’t have to take a ton of time and is certainly well worth your effort. The protocol for this process was developed by researchers at the University of Minnesota. For more information on the procedure, go to:
http://www.soybeans.umn.edu/crop/insects/aphid/aphid.htm

 
This blog is provided as an interactive way for you to have your questions answered by our Farm Journal Agronomists. E-mail your nitrogen, soil fertility, soil density, planter set up, scouting, and other questions to TestPlots@FarmJournal.com.

This Farmer Asks How To Prevent White Mold In Soybeans

Jul 09, 2010
Question: We had a terrible time with white mold in our soybeans last year, and it was in our best beans! I’m not seeing it yet this season, but what can I do to prevent it?

Answer: You're not alone. We have received a number of questions about white mold as the result of problems farmers had with it in 2009. White mold results from a fungus, Sclerotinia sclerotiorum, and it’s typically a problem in higher yielding soybean crops, due to several agronomic-type factors. Early canopy closure, higher plant populations and narrow rows seem to contribute to the problem. If your soybean crop is nearing canopy closure, you need to start scouting for apothecia which produce the fungus spores. Apothecia look like tan, mushroom-looking caps clumped together. Depending on what you find in your fields, you have a couple of options. One option for prevention is to apply Cobra herbicide, which is labeled for white mold suppression. However, if the disease is present, you may want to consider using a foliar fungicide like Domark, Endura or Topsin. If you opt for the fungicide, do talk with your local retailer about how to use it for best results as application timing and coverage are important.

www.agweb.com/farmjournal/soybeannavigator/Article.aspx?id=154124
Whammed by white mold!


ipcm.wisc.edu/.../White-Mold-in-Soybean-in-2010-Factors-to-Consider.aspx 
White mold is a problem in high yield potential soybeans.


This blog is provided as an interactive way for you to have your questions answered by our Farm Journal Agronomists. E-mail your nitrogen, soil fertility, soil density, planter set up, scouting, and other questions to TestPlots@FarmJournal.com.


 

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