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Posts From Tom Allen, Extension Plant Pathologist

Soybean R3/R4 Fungicide Selection

Soybean R3/R4 Fungicide Selection

🕔11:00, 18.Jun 2016

Numerous questions over the past few weeks regarding fungicide product selection for the R3/R4 soybean application timing. Specific comments regarding the efficacy of products on frogeye leaf spot will be presented in an additional blog post. In this post, comments regarding application volume, fungicide application rates and decision on specific products.

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Corn Disease Update: June 18, 2016

Corn Disease Update: June 18, 2016

🕔07:00, 18.Jun 2016

To date, disease issues in the MS corn crop have remained somewhat quiet. Common rust has been the most prevalent disease as a result of wetter and cooler temperatures until the past 7 to 10 days. As of this morning (6/18/2016), southern rust has not been detected in MS.

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When is the Best Time for the “Tassel Shot” on Corn?

🕔12:47, 31.May 2016

Many corn growers are implementing different “tassel shot” inputs as part of their management program. Questions often arise regarding how critical the application timing is, especially when weather or other issues may complicate timing of such inputs. This article discusses situations when application timing may be very important, as well as those when precise timing is not critical.

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Rice Disease Calendar

Rice Disease Calendar

🕔11:53, 28.May 2016

Included in this blog post are a rice disease calendar. Information presented in the calendar deals with the most commonly observed rice diseases throughout the MS rice production area. In general, the occurrence of diseases on rice will depend on the planting date, general field history as related to previous crop, and the environmental conditions throughout the season.

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UPDATED First Soybean Rust of 2016 Detected in Four Southwest MS Counties

UPDATED First Soybean Rust of 2016 Detected in Four Southwest MS Counties

🕔13:23, 25.May 2016

On Tuesday, May 24, 2016, soybean rust was detected on kudzu in Amite, Pike and Wilkinson counties in southwest MS. The observations of soybean rust yesterday mark the earliest appearance of the disease by a little more than 6 weeks as compared to the past. No specific management practices are suggested at this time.

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Updated Soybean Disease Calendars for MG IV and MG V Soybean

Updated Soybean Disease Calendars for MG IV and MG V Soybean

🕔07:29, 21.May 2016

Included in this blog post are updated disease calendars for MG IV and MG V soybean to aid in scouting plant diseases. Keep in mind that several variables can impact the time of year when specific diseases are observed. Planting date, variety susceptibility, number of years a particular field has been in soybean, and prevailing environment can all play a role in when a disease is observed.

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Wheat Disease Update: April 16, 2016

Wheat Disease Update: April 16, 2016

🕔09:41, 16.Apr 2016

Increased observations of foliar wheat diseases have occurred over the past two weeks. Leaf rust, stripe rust and Septoria leaf blotch have been commonly observed throughout the state. In addition, with the current environmental conditions (humidity, rainfall) and the general growth stages observed, the potential for Fusarium head blight (scab) may be similar to as occurred during the 2015 season.

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Wheat Disease Calendar

Wheat Disease Calendar

🕔13:46, 10.Apr 2016

Scouting for wheat diseases is most important once the flag leaf emerges. However, foliar diseases can occur throughout the growing season. In some cases wheat diseases differ by season based on inoculum pressure as well as environment.

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Updated Corn Disease Calendar

Updated Corn Disease Calendar

🕔07:43, 9.Apr 2016

Included in the current blog post is an updated disease scouting calendar. The timing of observations of some of the diseases included has been changed and some additional diseases that continued to be observed throughout the MS corn production system are included. Be mindful that foliar corn diseases can be observed throughout the entire season. Scouting for disease should begin shortly after emergence especially given that seed and seedling-associated diseases can impact corn stand as well as replant decisions in severe situations.

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Wheat Disease Update: March 25, 2016

Wheat Disease Update: March 25, 2016

🕔11:36, 26.Mar 2016

Wheat diseases have been few and far between this winter. Little wheat was planted in the fall of 2015. However, in some key areas, rust diseases (leaf and stripe) as well as bacterial leaf streak have been observed on wheat.

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2016 Scout Schools

2016 Scout Schools

🕔19:04, 18.Mar 2016

Mississippi State University will be hosting 5 scout schools this year. We have transitioned over the years to make these trainings much more diverse than insect pest alone. This year we will be including insects, disease, fertility, and herbicide symptomology.

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2014 Root-knot Nematode Soybean OVT Gall Ratings and Yield

2014 Root-knot Nematode Soybean OVT Gall Ratings and Yield

🕔10:38, 30.Jan 2016

The entries contained in the MSU soybean OVT were screened for their sensitivity to the root-knot nematode during 2014 (and again in 2015 – data forthcoming). Contained within this blog post are the root galling responses of 142 entries as well as the yield from the RKN infested location.

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Update: Disease Ratings for 2015 MSU-ES Soybean Variety Demo Program

🕔20:51, 4.Dec 2015

The results of the 2015 MSU-ES Soybean Variety Demonstration Program have been updated to include disease ratings for Cercospora blight, frogeye leaf spot, Septoria brown spot, and Target spot. These evaluations were collected at many locations in 2015 by Dr.

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Tri-State Soybean Forum – January 8, 2016

🕔20:11, 4.Dec 2015

The 60th Annual Tri-State Soybean Forum will be held at Mississippi State University’s Delta Research and Extension Center on January 8, 2016. Registration will begin at 8 a.m. followed by the program at 8:30. Presentations will include pertinent information for

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2015 North MS Maturity Group IV and V Variety Trial Report

2015 North MS Maturity Group IV and V Variety Trial Report

🕔09:51, 25.Nov 2015

A Maturity Group IV and V variety trial was conducted in Verona, MS at the NMREC during the 2015 season. Yield and disease data are included in the attached report for all entries contained in the trial (RoundUp, Conventional and LibertyLink).

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2015 North MS Maturity Group III Variety Trial Report

2015 North MS Maturity Group III Variety Trial Report

🕔08:48, 25.Nov 2015

A Maturity Group III variety trial was conducted in Verona, MS at the NMREC during the 2015 season. Yield and disease data are included in the attached report.

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2015 Soybean OVT Foliar Disease Ratings: Maturity Group V

2015 Soybean OVT Foliar Disease Ratings: Maturity Group V

🕔16:30, 20.Nov 2015

Field evaluations of the Maturity Group IV entries in the MSU OVT were conducted at each of the locations where trials were planted (Brooksville, Clarksdale (n=2), Falkner, Longwood, Raymond, and Stoneville (n=3)).  Entries were observed for their reaction to the diseases

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2015 Soybean OVT Foliar Disease Ratings: Maturity Group IV

2015 Soybean OVT Foliar Disease Ratings: Maturity Group IV

🕔18:56, 18.Nov 2015

The MSU OVT soybean locations were rated for disease during the 2015 season. Multiple diseases were rated at multiple locations. In the past, Cerospora leaf blight and frogeye leaf spot have been the two main diseases rated. In 2015, Septoria brown spot as well as target spot were included as well as a green stem rating. Phytotoxicity, following an accidental fungicide application, was rated in the Maturity Group IV early and late entries at one location.

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2015 Soybean OVT Stem Canker Ratings

2015 Soybean OVT Stem Canker Ratings

🕔06:06, 14.Nov 2015

The cultivars contained in the Mississippi State University Official Variety Trial (OVT), as well as a few added cultivars, were field-evaluated for their susceptibility/resistance to stem canker. Trials were conducted in Stoneville with toothpick-inoculated plants during the 2015 season. Tables contain the average ratings (on a 0-9 scale) as well as an assessment of resistance to stem canker (R, MR, MS, S) based on the ratings conducted.

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2015 Wheat OVT Disease Rating Data

2015 Wheat OVT Disease Rating Data

🕔11:26, 31.Oct 2015

Wheat disease ratings from several of the 2015 MSU OVT locations are included. Diseases differed by location during the 2015 season. However, Fusarium head blight (FHB) was one of the most commonly observed diseases. Keep in mind that environment may have differed by location therefore some varieties may have appeared to have responded to FHB infection differently.

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First Look: 2015 North MS Research and Extension Center Soybean Disease Ratings (EDITED)

First Look: 2015 North MS Research and Extension Center Soybean Disease Ratings (EDITED)

🕔09:59, 31.Oct 2015

The soybean variety trial ratings from the North Mississippi Research and Extension Center (NMREC) are included (MG III, IV, and V). The yield publication from NMREC will be posted at a later date. As in the past, plots were rated for Cercospora leaf blight (CLB) and frogeye leaf spot (FLS). However, this year, Septoria brown spot (Septoria) and target spot were also rated when the diseases were present. Green stem ratings were conducted for the Maturity Group IV early and late varieties.

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2015 Delta Area Rice Growers Meeting: November 5, 2015

2015 Delta Area Rice Growers Meeting: November 5, 2015

🕔17:01, 1.Oct 2015

The 2015 Delta area/Bolivar Co. Rice Meeting will be held at the Bolivar Co. Extension office on November 5, 2015. Mississippi rice producers, industry professionals, and other interested parties are invited to listen to presentations from MSU research and Extension

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Are Late-Season Soybean Rust Observations Important?

Are Late-Season Soybean Rust Observations Important?

🕔21:49, 22.Sep 2015

Late-season soybean rust observations occur on almost an annual basis. Even though the majority of the soybean crop has escaped yield loss as a result of soybean rust again for the 2015 season, determining the extent of the disease in MS as well as potential locations where the fungus could overwinter continue to be an important part of the monitoring/scouting program. At present (9/22), soybean rust has been detected in 41 counties.

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Late-season Soybean Disease Clinic: Baldwyn, MS, September 15, 2015

Late-season Soybean Disease Clinic: Baldwyn, MS, September 15, 2015

🕔06:31, 14.Sep 2015

A field training regarding late-season soybean diseases will be held in Monroe County, MS on Tuesday, September 15 beginning at 5:30 pm and ending with a meal at a local restaurant.  The diseases discussed will likely include: charcoal root rot,

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Soybean Disease Update: September 5, 2015

Soybean Disease Update: September 5, 2015

🕔06:48, 5.Sep 2015

Soybean diseases continue to be observed throughout the MS soybean production area. The number of counties (13, as of 9/4/2015) exhibiting soybean rust has increased over the past several days. However, low levels of infection have been observed at most locations. Frogeye leaf spot, Cercospora blight, target spot, and stem canker also continue to be observed.

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