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Kentucky reporting 10 rust spores in trap; first in commonwealth
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7/7/2005 -- 7:45 p.m. CDT -- Kentucky is the second state today to report finding spores presumed to be soybean rust, with 10 from spore traps near Woodburn, Ky., in Warren County. Earlier today, Tennessee reported the finding of two spores from a trap in Jackson.
Officials in both states say spraying soybeans for rust is not recommended at this time.
Don Hershman, Extension plant pathologist at the University of Kentucky, put the spore information on the Kentucky commentary at www.sbrusa.net this afternoon. He also sent this photograph of the microscopic spores from the Woodburn trap in south-central Kentucky:
Earlier today, two rust spores were found in a spore trap located at the West Tennessee Experiment Station in Jackson. No sign of soybean rust has been found at the adjacent sentinel plot site.
Hershman: Not time to spray yet
In today's commentary and listserv messages, Hershman said he was "still adamant that spraying for soybean rust at this time is premature and unnecessary.
"Keeping this all in perspective, nine other spore traps in each state (KY and TN) were negative for spores, and NO soybean rust has been found on soybean or kudzu in either state," he said.
"Finding spores simply means that soybean rust may soon be found here. However, the low level of spores also indicates that it will be some time before infections will be visible, let alone be of any consequence."
Expanding on his no-spray message, Hershman said "Spraying now may result in the need for a second spray later in the month or in August when a fungicide application may be truly necessary. Until there is some evidence that a soybean rust epidemic is beginning to take form, it is suggested that the spray rig remain in the barn and your money in the bank.
"I will be able to say more once Hurricane Dennis has done its 'thing.'" The path of the hurricane cannot be known with certainty at this time, Hershman said.
"The projected path suggests that the hurricane may move more rust spores into the Midsouth, including Kentucky. Even if that is the case, based on our experience so far from the Deep South, it will take two to four weeks of consistently wet weather (rain/dew)to kick-start a rust epidemic here," he said.
Hershman reported that a significant percentage of Kentucky's full-season soybean crop has developed a full canopy or is in the early to mid-reproductive stages. Double-crop beans are generally in the early to mid-vegetative stages.
He also reminded Kentucky soybean producers that they MAY use Section 18 fungicides at their discretion, but only with soybean rust management in mind and when the soybean rust risk is determined to be high, based on credible sources of information.
Sources: Kentucky state commentary 7/7/20 on www.sbrusa.ent, plus follow-up e-mail messages and photograph from Don Hershman, University of Kentucky.
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