Last week, signs and symptoms of red crown rot of soybean were observed in a few fields in Graves County, Kentucky by a local agronomist (Clint Gregory with Hutson Ag) who contacted the University of Kentucky.
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The University of Kentucky Plant Disease Diagnostic Lab in Princeton confirmed the state’s first case of tar spot on corn during the week of Sept. 13. Curt Judy, Todd County agriculture and natural resources extension agent, submitted the diseased sample from an inbred corn line that was part of a local breeding trial. It was not found in a commercial corn field. The disease was found on plant leaves.
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When comparing the past two decades of climate normals, central and eastern parts of the Commonwealth have seen a 7-10% rise in annual precipitation.
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“We are seeing better yields,” said Reding, whose family farms in multiple counties in Central Kentucky. “Some of that is obviously related to the weather, but we also have adopted improved planting practices and technology advancements that have contributed to higher yields.”
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After water, N is most often limiting to crop production. Notably, soybean can form a symbiotic relationship with bacteria, Bradyrhizobium japonicum, which biologically fix dinitrogen (N2) gas making up 78 percent of our atmosphere.
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Southern rust of corn, caused by the fungus Puccinia polysora, was confirmed in Kentucky on July 12, in Union County.
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There have been several reports of dicamba off-target movement onto soybean and other sensitive crops reported over the last two weeks in parts of Kentucky.
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The cool, cloudy and rainy temperatures this spring delayed wheat development across much of Kentucky. The wet weather recently has many thinking about adding a harvest aid to their fields. Although much of the wheat is likely back to a ‘normal’ development stage due to recent record-breaking high temperatures, many producers may already be considering harvest aids in wheat.
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The soybean gall midge, Resseliella maxima (Diptera: Cecidomyiidae), is a relatively new pest in soybean. A recent report showed that soybean gall midge is spreading rapidly, reaching 144 counties by September of 2020, including two western counties in Missouri. Thus far, the soybean gall midge has not been detected in Kentucky.
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Some years have gone by since I summarized UK research about soybean yield response to sulfur (S) here in Kentucky. The objective of this article is to update my previous summary, a meta-analysis which included research work done between 2007 and 2012, reported in 2013.
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Seedcorn maggots in corn and soybeans have been seen during cool and damp seasons and organic rich soils (manured can be a source of this) or fields with reduced tillage, or decaying residue from the previous.
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Rainy and cloudy days with soggy and cool nights are favorable for mollusk activity. These conditions describe the past 3 to 4 week’s weather conditions in Kentucky, and the damages these organisms are causing to soybean seedlings.
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Weather this spring has challenged corn farmers in Kentucky. Temperature swings and frequent rainfall have led to a wide range of corn growth stages, with some corn in early vegetative stages and some corn still in the bag.
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Corn and Soybean planting progress is ahead of schedule in Kentucky, according to the USDA NASS Crop Progress & Condition Reports. We normally think about that being a good occurrence. But many farmers and crop consultants have reported that the corn and soybeans appear to be standing still. The forecast suggests that will change in a few days.
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Quite a few acres of corn and soybean may have been planted within the past week. Couple that with these air and soil temperatures and the duration of the freeze event, many of us are probably going to be walking a lot of fields in the next week to ten days to assess whether any damage occurred.
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Soybean that has emerged is at risk of being frozen off below the cotyledons. If the plants are frozen off below the cotyledons, they will die.
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Corn that is trying to emerge (germinated and the shoot is growing towards the soil surface) is at greatest risk with the cold weather in the forecast. That cold weather could send shoots downward.
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The successful control of waterhemp and Palmer amaranth in soybean has consistently come back to the use of a residual herbicide at soybean planting.
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