Category Archives: Soybean

Taproot Decline: A new soybean disease for Tennessee

Author: Rachel Guyer, Plant Pathology Research Associate No Comments

Taproot decline (TRD) is a new disease to us in Tennessee and other states in the Southeast. A member of the genus (Xylaria) was first isolated from soybean in Ethiopia in the ‘70s , however researchers at that time did not confirm if this fungus was the pathogenic species that is now affecting soybeans across the southeastern US. The first report of taproot decline as a pathogen of soybean was published just last year, with sightings of this disease first occurring in 2007. Other states that have reported cases of TRD include Alabama, Mississippi, Louisiana, and Missouri with an increasingly northern range. A production field in Saulsbury (Hardeman County) was confirmed to have soybeans affected by TRD in August 2017, and two additional research fields in Gibson and Madison counties were confirmed in August 2018. Foliar symptoms were initially spotted at growth stage R6 (i.e. full seed); these foliar symptoms can easily be confused with those due to other diseases like sudden death syndrome and stem canker, and closer observation is needed for disease Continue reading

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Monitor for Grass Control Failures from the Combine or Picker

Author: Larry Steckel, Extension Weed Specialist Comments Off on Monitor for Grass Control Failures from the Combine or Picker
Awned Barnyardgrass Left and Awnless Jungle Rice Right

In a good part of West Tennessee most soybean and cotton fields have at least some goosegrass and jungle rice (awnless barnyardgrass) present.  In southwest Tennessee a good many cotton fields and particularly soybean fields have serious infestations of both of these grass species.  Continue reading

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Reminder: Soybean Disease Field Day – Tuesday, Sept. 4, 2018

Author: Heather Marie Kelly, Extension Plant Pathologist Comments Off on Reminder: Soybean Disease Field Day – Tuesday, Sept. 4, 2018

Wondering what’s been making your soybeans sickly? Come to The University of Tennessee Soybean Disease Field Day, held Tuesday, Sept. 4th, at the Milan Research and Education Center. Registration will be from 8:30-9:00 AM with the tour beginning at 9 AM and concluding with a box lunch.  Preregistration is not required. Pesticide re-certification and CCA points will be available. Field demonstrations will include soybean disease identification, UT variety trials, fungicide efficacy trials and other UT disease research trials. Hands on disease identification will cover main soybean diseases that occur in Tennessee including frogeye leaf spot, target spot, Cercospora leaf blight, southern stem canker, sudden death syndrome, and others.

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Cotton and Soybean Update

Author: Scott Stewart, IPM Extension Specialist Comments Off on Cotton and Soybean Update

I ran a post last week that somehow got lost in cyberspace, so this is my effort to recreate it.

Cotton: The gist of my post last week was that most early planted cotton has accumulated more than 350 DD60s past NAWF5, and thus, insect management was Continue reading

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Soybean diseases, fungicides, and soil sampling

Author: Heather Marie Kelly, Extension Plant Pathologist Comments Off on Soybean diseases, fungicides, and soil sampling

Most soybeans have gotten into reproductive growth stages and diseases may have started appearing although at low levels. To better identify diseases and guide management decisions use the resources below… Continue reading

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Cotton and Soybean Insect Update

Author: Scott Stewart, IPM Extension Specialist Comments Off on Cotton and Soybean Insect Update

Cotton: Much of our cotton is within 7-10 days of when insect controls can be terminated, and it looks like this cotton may outrun the bollworm moth flight in many areas. Most the bollworm action appears to be pretty moderate and still primarily concentrated along the Mississippi River and south of I-40. Having said that, we are some seeing bollworm larvae slip through on Bollgard 2, WideStrike, and TwinLink varieties. It’s a numbers game. Continue reading

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