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Late-Season Dry Weather and Corn

  • September 11, 2013
  • Emerson Nafziger

The 2013 corn growing season has had its share of ups and downs, with late planting due to early rainfall, more rain in June, and temperatures that were at or below normal most of the season until recent weeks. Pollination conditions were good in most places, with adequate soil moisture and generally good temperatures. By late July most fields were in good shape, with good kernel counts and good canopy color and leaf health.
Much of the crop reached the middle part of August in good shape,…

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Soybean rust: status and risk

  • August 19, 2013
  • Aaron Hager

Observations of soybean rust in southern states indicate that the pathogen (Phakopsora pachyrhizi) is beginning to move northward towards Illinois. Based on current movement, soybean rust likely will arrive in Illinois again this year, but it may not be in the state early enough to cause any yield losses. Late-planted fields would be the most at risk to losses caused by soybean rust. In general, once soybean plants reach the R6 stage (full seed stage),…

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Southern rust of corn observed in Illinois

  • August 14, 2013
  • Aaron Hager

Southern rust of corn has now been observed in different areas of Illinois.  Southern rust is one of two different rust diseases of corn that can be observed in the state (the other is known as common rust).  Because nearly every corn hybrid grown is susceptible to southern rust, yield reductions can occur if infection takes place early enough in the season.  Late-planted corn fields are at the highest risk for yield losses associated with southern rust and should be scouted for the presence of this disease. …

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Will The Corn and Soybean Crops Get Finished?

  • August 8, 2013
  • Emerson Nafziger

Late planting and weather that continues to be cooler than normal into August has many wondering if the corn and soybean crops will reach maturity and harvest moisture within a reasonable time this fall. Crop conditions remain good for both crops, but crop development, including pod formation and filling in soybean and grain fill in corn, remains well behind normal. Corn is 10 days to 2 weeks behind normal, and soybeans are 2 to 3 weeks behind normal.…

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Check Corn Pollination

  • August 2, 2013
  • Emerson Nafziger

We are starting to get reports that corn pollination might not have been as successful as expected in parts of Illinois. While the weather was generally favorable during the peak period of pollination, it was warm during the third week of July, and soil water may have been limiting during this period in some fields. Thus we would expect to see this in the areas with low rainfall in July.
This is not the lack of silking that we saw in many areas under the drought of 2012.…

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Assessing the risk of white mold (Sclerotinia stem rot) of soybean in 2013

  • July 22, 2013
  • Aaron Hager

White mold of soybean (a.k.a. Sclerotinia stem rot), caused by the fungus Sclerotinia sclerotiorum, is a disease that can occur in the northern half of the state in cool, wet years.  The most recent white mold epidemic in Illinois occurred during the 2009 season, where several fields in the northern half of the state were affected.
The white mold fungus overwinters in the soil as, small, black, and dense structures known as sclerotia. …

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Corn and Soybean Crops at Mid-Season

  • July 20, 2013
  • Emerson Nafziger

The third week of July brought above-normal temperatures to much of Illinois. This is expected to be temporary, with temperatures the fourth week expected to return to normal. Because soils in most areas had enough water to carry the crop through the week, we don’t think the high daytime temperatures were much cause for concern.
By July 14, 21 percent of the Illinois corn crop was pollinating. This included most fields planted before May 10 to 15.…

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Brownstown Agronomy Research Center Field Day – July 25

  • July 15, 2013
  • Aaron Hager

The 2013 Brownstown Agronomy Research Center Field Day, presented by the University Of Illinois Department Of Crop Sciences, will be held on Thursday, July 25. Extension researchers and specialists will address issues pertinent to the current growing season. Tours will start at 8 a.m., with the second and third groups leaving the headquarters around 8:20 a.m. and 8:40 a.m. The tours will last about two and a half hours and will be followed by lunch provided by U of I Extension.…

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Stormy weather and Goss’s wilt go hand in hand

  • July 2, 2013
  • Aaron Hager

Goss’s wilt of corn often is most severe after fields are exposed to high winds and/or hail damage, because the causal bacterium, Clavibacter michiganensis subsp. nebraskensis, readily infects corn leaves through wounds.  With the recent storm activity across the state, growers should be on the lookout for the appearance of Goss’s wilt symptoms.  Goss’s wilt lesions on the leaves generally have wavy margins with a water-soaked appearance on the edges of the lesions. …

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Corn Roots, Wet Soils, and Nitrogen

  • June 28, 2013
  • Emerson Nafziger

The June weather pattern in Illinois was variable, and the month is ending with rainfall totals ranging from a little less than normal in parts of western Illinois to nearly double the normal amounts, with some totals as high as 7 to 8 inches, in parts of southeastern and northern Illinois.
While getting rainfall in June is certainly preferable to getting little or none as happened in Illinois in 2012, standing water and wet soils can badly damage a rapidly-growing corn crop.…

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