UK Home Academics Athletics Medical Center Research Site Index Search UK

College of Agriculture Signature Logo 
  College of Ag Home Site Index Search People Help



 
Our Mission
 
Extension Faculty & Staff
 
Educational Programs
 
Plant Disease Diagnostic Labs
 
Kentucky Pest Alert
 
County Agent Training & Support
 
Crop Biosecurity
 
Soybean Rust Information
 
Soybean Cyst Nematode Information
 
Resources
 
Publications
 
Links
 






Extension
Extension

Kentucky News updated as of September 21, 2009

  • Note: This SBR update is directed to KENTUCKY SOYBEAN PRODUCERS. If you live in another state, read what I say, below, with the extreme sensitivity that what I am writing may not (and probably does not) apply to you. I encourage you to find out what is being said by the Extension Plant Pathologist your state by going to www.sbrusa.net.

  • Hello Everyone,

  • On Friday of last week we found soybean rust in Ballard County in far west KY. The level of disease was as low as it could possibly be (one leaf out of 100 that had one lesion, with one pustule!). This was the third SBR find in KY, the other two finds being in Warren County and Henderson County.

    I have been pretty open about my belief that the vast majority of soybeans in Kentucky are well beyond the point where they could possibly be damaged by soybean rust. However, I also know that some fields in the state were planted very late and that development in July may have been hindered by wet and cool conditions. The bottom line is that there may be the rare field that needs all of October to completely fill pods. When I say, rare field, I am talking about fields planted in July to a group 5 soybean. By way of comparison, our Grains Crop Specialist, Dr. Jim Herbek is conducting a planting date study here at the UKREC where he planted a mid-group 4 variety on July 7th. That field was at the beginning flowering stage (R1) on August 10 and currently is at the full seed (R6) stage. The fields I am referring too would probably be at the full pod (R4) stage or barely into beginning seed (R5) at the present time.

    My guess is that we could have considerable soybean rust in west Kentucky by the middle of October. By then, most soybean fields in the state will be at the R6 stage or later, and some will have been harvested. But, I am aware of the possibility that a few soybean fields may still be filling pods during the second part of October (assuming we do not have a hard frost before then). So, while most of you will not be impacted, if you have a field that may still be filling pods by mid-October, it would be wise to consider the prospect of applying a triazole fungicide (like Folicur or a generic, all of which are fairly inexpensive) soon if a highly specific set of conditions exist.

    After careful consideration, I have decided to send out the attached a SBR Yield Loss Calculator, which has been developed by Dr. Saratha Kumudini, Crop Physiologist in the University of Kentucky Dept. of Plant and Soil Sciences. The tool was developed specifically to help with making fungicide use decisions regarding soybean rust. It is still being refined, but it is something to work with, and to be honest, the only alternative is to guess what might happen as the season winds down. The tool is research-based, so it is far superior to guessing. Give it a look-see; you might find it to be very useful. It does require that you input some specific field and cost/price information. For the purposes of the tool, you should probably pick the worst case scenario, “severe” epidemic. Obviously the epidemic is not severe right now. Reality would probably be better reflected by the “moderate” epidemic scenario, but it is better to err on the of caution.

    Even if you do not have any really late fields, I encourage you to look at and play with the SBR Yield Loss Calculator. But realize that it is still a work in progress in terms of both appearance and functionality. I would appreciate any feedback regarding the calculator and how useful you feel it is/was/will be.

    This advisory applies to the area west of I-65. If you are east of I-65, I would say you are “good to go” for 2009.

    Below is the current distribution of soybean rust in the US. I am sure there will be many more positives over the next few weeks in KY and elsewhere.

image 2009

  • Have a rust-free day.

2009

2008

2007

Trainings

  • no soybean rust specific trainings are presently being offered in Kentucky
About Us | Extension | Graduate Education | People | Research | News & Events | Contact Us | Home

 

Questions/Comments | Copyright © | An Equal Opportunity University,
University of Kentucky, College of Agriculture
Last Updated:


This is a Java Script that displays the date the page was last modified. It is inconsequential to the navigation and content of this site.