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By Rich Pope, Department of Plant Pathology
Another August week down and it was again a favorable week with nearly normal temperatures. What we need most now is to avoid extremes in temperatures throughout the next month, with periodic rainfall. Last week was actually the first in nearly two months that was, albeit slightly, above normal in heat accumulation.
By Steve Barnhart, Department of Agronomy
Despite some of the fungicides being classified as 'curative', there most likely will be little positive effect from any fungicide applied at this time because of the stage of the disease.
There is much evidence to show treating aphids when they exceed the economic threshold up to R5.5 will protect yield. But what happens if aphid populations are still increasing past seed set?
Sunday storms that resulted in hail and high wind damage to crops create the theme for this week's report.
By Roger Elmore, Department of Agronomy
Hail storms again devastated portions of Iowa's corn crop on Aug. 9. Storms cut a 1 to 8 mile swath across north central Iowa. Producers in its path are asking, "How does hail after tasseling affect yield?"
ISU Extension agronomists believe this summer's weather may produce another high or record average corn yield.
A growing interest in nematodes that feed on corn prompts this article listing basic characteristics of different types of corn nematodes.
Carefully checking roots now for soybean cyst nematode (SCN) females can tell you if resistant soybean varieties are controlling the nematode in the field.
Knowing the characteristics of Goss's wilt and northern corn leaf blight help in identification of the diseases; photographs illustrate those characteristics.
