There are numerous stalk rots that affect corn in mid to late season. Weather, nutrition and genetic disease tolerance all play major parts in the disease cycle. Plants move nutrients from the stalks to the ears during grain fill. High yields mean heavier ears. These two phenomena combined can make stalk quality issues a problem even in very high-yielding areas.
Categories: Agronomy, Agronomy Talk
Tags: corn, Disease, stalk rot, residue management, corn stalk rot, plant stress
Tar Spot is a new phenomenon in the US. It is caused by a fungus called Phyllachora maydis, native to Central America. Tar Spot had only been identified in very isolated geographies in the U.S. until the summer of 2018. In Central America, the yield-robbing form of Tar Spot forms a complex with two other plant pathogens, neither of which have been documented in the U.S. It is unknown whether the Tar Spot organism is forming a pathogenic complex with other species present in the Midwest.
Tags: corn, Disease, tar spot
Record precipitation totals for June have caused concern for corn and soybeans heading into harvest. Many corn fields lost nitrogen and will have a limited ability to adequately fill kernels. Because of this, I expect many corn fields will have ears displaying aborted kernels. In addition, saturated soils may have pre-disposed corn plants to stalk rot infection.
Categories: Agronomy Talk
Tags: Illinois, Indiana, Chad Kalaher, Agronomy, Beck's, White Mold, Disease, Agronomy Talk, Sudden Death Syndrome, Wisconsin, aborted kernels, stalk lodging, brown stem rot
Soybean cyst nematode sampling is best done six to eight weeks after planting. Target fields where yields have plateaued, areas with pH>7, and areas where weed control is lacking.
Tags: Agronomy, Denny Cobb, Scouting, Disease, European corn borer, Becks Hybrids, Agronomy Talks, Becks, pests, non-gmo, soybean cyst nematode
Spring was challenging for many farmers due to inconsistent weather
patterns, fluctuating temperatures
and heavy precipitation. In most cases,
stand reductions in corn and soybeans were
a result of this. Some corn experienced an
imbibitional chilling effect and/or corkscrewed
mesocotyls. Replant was necessary where
very heavy rainfall occurred shortly after
planting and prior to crop emergence. Most
of the agronomic challenges experienced
were related to cool and/or wet conditions. In
some areas, stand challenges were magnified
by timing of a herbicide application and
specific herbicide chemistry, especially in
soybeans. In corn, interveinal leaf striping and
rapid growth syndrome were both found near
V3-V6. Again, both of these can be related
to environmental conditions and typically
improve with favorable conditions.
Tags: Illinois, Indiana, Chad Kalaher, Agronomy, Beck's, Disease, Agronomy Talk
The month of May is a busy time of year for most of us, to say the least. This does not allow much time for scouting, but it is important this time of year. To review some key points, let’s think about the crops in the field in May.
Tags: corn, soybeans, Jonathan Perkins, Southern Illinois, Missouri, Winter Wheat, Spring Scouting, May, Disease, Insects
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