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Northern Illinois Agriculture

University of Illinois Extension
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Hang on!

Hang on to your hat, your clipboard, or anything you are trying to carry today. If you don't; it will most certainly end up in your neighbor's field. Windy conditions are preventing us from any applications at the NIARC today; farm foreman Dave Lindgren is planting our remaining fill areas with soybean. For farmers who still have soybean to plant the questions we are hearing include

Should I
1.Wait for rain before planting
2.Plant deep
3.Plant at normal depth and wait for rain
Dr. Emerson Nafziger addressed this topic and shared the following comments. Under favorable conditions most soybeans can successfully emerge from planting depths of 2½ inches. However, planting deeper than two inches increases the risk of the seedling being sealed off prior to emergence with a heavy rain event. If you need to plant as deep as 3 inches to reach moisture you may reconsider. While hard to do as we move closer to June, the best case scenario is for soybeans to emerge with little or no rain between planting and emergence, both from a disease standpoint and from the standpoint of crust formation. Dr. Nafziger's entire article can be found here
Yesterday a producer was questioning the economic threshold for Bean leaf beetles. While absent in most early season sweeps I have made at the NIARC, feeding had obviously taken place on this producers no-till field. Dr. Mike Gray provided an updated threshold that accounts for higher commodity prices. From Dr. Grays article; "For 30-inch row beans (population of 150,000 plants per acre) with 8.6 plants per foot of row, this estimated threshold is equal to 17.2 to 25.8 beetles per foot of row. This adjusted threshold is lower than the threshold suggested in 1995, but a large number of beetles still have to be present for a rescue treatment to be warranted."
The entire article can be found here

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