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Posts From Tom Allen, Extension Plant Pathologist

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) Updated

👤Tom Allen, Extension Plant Pathologist 🕔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 Updated

👤Tom Allen, Extension Plant Pathologist 🕔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? Updated

👤Tom Allen, Extension Plant Pathologist 🕔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 Updated

👤Tom Allen, Extension Plant Pathologist 🕔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 Updated

👤Tom Allen, Extension Plant Pathologist 🕔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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Mississippi State University Turn Row Talk – Clarksdale, August 25, 2015

Mississippi State University Turn Row Talk – Clarksdale, August 25, 2015 Updated

👤Tom Allen, Extension Plant Pathologist 🕔14:57, 20.Aug 2015

An agronomic crops field day will be held at Stovall farms, west and north of Clarksdale on Oakhurst Stovall Road. The field day will be held at Mr. Pete Hunter’s farm shop beginning at 10 am. MSU Extension Specialists will be present to discuss topics in corn, cotton, grain sorghum, peanut, rice and soybean.

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Soybean Disease Update: August 8, 2015

Soybean Disease Update: August 8, 2015 Updated

👤Tom Allen, Extension Plant Pathologist 🕔11:48, 8.Aug 2015

Soybean disease continues to be observed throughout the MS soybean production system. Frogeye leaf spot, root-knot nematode, and a first report of soybean rust occurred over the past 7 days. In addition, widespread fungicide phytotoxicity has been observed in numerous fields due to the hot and humid conditions.

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Soybean disease update: July 31, 2015

Soybean disease update: July 31, 2015 Updated

👤Tom Allen, Extension Plant Pathologist 🕔09:40, 1.Aug 2015

The diseases present in the soybean crop have increased over the past several weeks. Cercospora blight and frogye leaf spot continue to be observed throughout much of MS. Fungicide phytotoxicity continues to be one of the hot topics of the 2015 season with numerous fields having received specific fungicide products that resulted in a foliar injury due to the extreme temperatures.

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Reminder – MSU DREC Rice Field Day – July 30, 2015 Updated

👤Tom Allen, Extension Plant Pathologist 🕔20:14, 26.Jul 2015

The MSU-DREC Rice Producer Field Day will be held in conjunction with the annual Mississippi Farm Bureau Federation Summer Rice Grower Meeting this year on the afternoon of July 30 at the Capps Center in Stoneville.. The Farm Bureau meeting

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Diagnosing Fungicide Phytotoxicity and Telling Apart from Root Diseases

Diagnosing Fungicide Phytotoxicity and Telling Apart from Root Diseases Updated

👤Tom Allen, Extension Plant Pathologist 🕔09:32, 22.Jul 2015

Phytotoxicity as the result of applying fungicides that contain an active ingredient that produces an “injury” to soybean leaves has been observed this year. Large areas of fields or entire fields in an area with observable interveinal chlorosis should be observed for the presence of a specific disease. Observing root systems as well as cutting into the main stem to expose the vascular tissue should help tell the difference between many soybean root diseases and whether or not a disease is present.

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Soybean Disease Update: July 18, 2015

Soybean Disease Update: July 18, 2015 Updated

👤Tom Allen, Extension Plant Pathologist 🕔06:26, 18.Jul 2015

The soybean disease situation has not changed much over the past week, but as the crop matures more diseases will likely be observed throughout the state. At present, brown spot, frogeye, the mystery disease, and a few other minor issues can be observed in most soybean fields.

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Scouting and Managing Rice Blast

Scouting and Managing Rice Blast Updated

👤Tom Allen, Extension Plant Pathologist 🕔08:40, 17.Jul 2015

Rice leaf blast has been observed most of the rice season throughout the MS Delta. In addition, neck blast has been observed in some fields that were infected early on with the blast fungus.

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Corn Disease Update: July 11, 2015

Corn Disease Update: July 11, 2015 Updated

👤Tom Allen, Extension Plant Pathologist 🕔07:15, 11.Jul 2015

The diseases encountered throughout the MS corn crop continue to be the same. Northern corn leaf blight and southern corn rust continue to be the two most talked about diseases. Annually, as the corn crop matures, NCLB appears to increase since lesions reach their most mature expression. Southern corn rust has been observed in 19 MS counties to date (July 11, 2015). Fields where the disease has been observed typically contain a light dusting of rust.

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2014 Frogeye Leaf Spot and Cercospora Blight Foliar Fungicide Trials: Trial Data Updated

👤Tom Allen, Extension Plant Pathologist 🕔20:07, 5.Jul 2015

Numerous fungicide trials were conducted during 2014 to determine the efficacy of specific fungicide products as well as tank mix components at managing Cercospora leaf blight and frogeye leaf spot. Included in this post are ratings as well as yield for eight total trials conducted in Starkville (2) and Stoneville (6) during the 2014 season.

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Soybean Disease Update: July 5, 2015

Soybean Disease Update: July 5, 2015 Updated

👤Tom Allen, Extension Plant Pathologist 🕔19:59, 5.Jul 2015

The incidence of soybean diseases in the MS soybean production area has increased over the past 10-14 days. Aerial blight, Cercospora blight, frogeye leaf spot, Septoria brown spot, target spot, and Vein necrosis virus have all recently been observed in commercial soybean fields throughout MS.

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Corn Disease Update: July 4, 2015, Southern Rust Observed in Five Counties (UPDATED @ noon)

Corn Disease Update: July 4, 2015, Southern Rust Observed in Five Counties (UPDATED @ noon) Updated

👤Tom Allen, Extension Plant Pathologist 🕔08:53, 4.Jul 2015

Corn diseases have started to be more commonly observed throughout the MS corn production area. Given the time of year in both calendar date and crop stages (post-tassel) several corn diseases are being observed more often. Northern corn leaf blight, southern corn leaf blight, and Diplodia ear rot have all been observed over the last two weeks. Southern corn rust made an appearance earlier than normal; however, the disease is considered to be at extremely low levels at this time even though five counties (Adams, Claiborne, Coahoma, Forrest, Stone) have been observed to contain infected corn plants.

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Mississippi State University Turn Row Talk – Clarksdale, July 9, 2015 Updated

👤Tom Allen, Extension Plant Pathologist 🕔13:51, 3.Jul 2015

An agronomic crops turn row talk will be held at Cliff Heaton farms, just east of the intersection of Highway 61 and Highway 6 on July 9, 2015. The field day will be held in the cotton field

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Mid-Season Rice Update

Mid-Season Rice Update Updated

👤Tom Allen, Extension Plant Pathologist 🕔15:13, 19.Jun 2015

I would like to call this a midseason rice update, but in actuality we have rice in Mississippi ranging from one leaf to late boot in places, but most of the rice crop should be at or reaching mid-season. Similar

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Mississippi State University Turn Row Field Day: Clarksdale, MS July 9, 2015

Mississippi State University Turn Row Field Day: Clarksdale, MS July 9, 2015 Updated

👤Tom Allen, Extension Plant Pathologist 🕔14:29, 19.Jun 2015

An agronomic crops field day will be held at Cliff Heaton farms, just east of the intersection of Highway 61 and Highway 6. The field day will be held in the cotton field on the south side of the road. MSU Extension Specialists will be present to discuss topics in corn, cotton, grain sorghum, peanut, rice and soybean.

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Corn Disease Update: June 19, 2015

Corn Disease Update: June 19, 2015 Updated

👤Tom Allen, Extension Plant Pathologist 🕔13:30, 19.Jun 2015

For the most part, the corn disease situation has been quiet. Limited occurrences of common rust and northern corn leaf blight have been observed in some Delta fields. With the cooler and wetter conditions encountered early in the season it is possible that some uncommon diseases could be encountered.

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Automatic Soybean Fungicide Applications: Timing, Product Choice, Rates in Product Combination

Automatic Soybean Fungicide Applications: Timing, Product Choice, Rates in Product Combination Updated

👤Tom Allen, Extension Plant Pathologist 🕔11:42, 19.Jun 2015

Questions continue regarding fungicide products to be used at the R3/R4 application timing. The most important decisions should be made based on the specific variety planted in each field since frogeye leaf spot is resistant to the strobilurin class of fungicides meaning that stand-alone strobilurin products are no longer effective against the disease. See the information contained within this blog post regarding fungicide products, effective rates of products in pre-mix combinations and the effectiveness of some fungicides on managing frogeye leaf spot.

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Crazy Top Downy Mildew of Grain Sorghum Observed in Many Delta Fields

Crazy Top Downy Mildew of Grain Sorghum Observed in Many Delta Fields Updated

👤Tom Allen, Extension Plant Pathologist 🕔18:05, 8.Jun 2015

Crazy top downy mildew has been observed in numerous grain sorghum fields over the past two weeks. The general symptoms associated with the disease can oftentimes be confused for herbicide injury as well as a nutrient deficiency. Fields with grain sorghum that may have stood in water for an extended period of time may have become infected by the soilborne fungus.

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Choose Fungicide Product for Soybean Fields Based on Variety Planted

Choose Fungicide Product for Soybean Fields Based on Variety Planted Updated

👤Tom Allen, Extension Plant Pathologist 🕔15:13, 31.May 2015

Choosing a foliar fungicide product for either a common fungicide application at a specific growth stage in the absence of foliar disease or in the presence of disease should be based on the soybean variety planted. Widespread fungicide resistance to the strobilurin fungicides in the MS soybean production system within the frogeye leaf spot fungal population may ultimately change how we use fungicides. Choose a fungicide product based on whether or not frogeye will occur in a susceptible variety rather than choosing a fungicide based on price.

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What is Appropriate Timing for the “Tassel Shot” on Corn?

What is Appropriate Timing for the “Tassel Shot” on Corn? Updated

👤Tom Allen, Extension Plant Pathologist 🕔15:58, 29.May 2015

More growers are implementing different “tassel shot” inputs as part of their corn management program. Wet weather and other issues may further complicate application timing of such inputs. This article discusses whether specific timing makes a big difference or not?

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Soybean “Mystery Disease” Update

Soybean “Mystery Disease” Update Updated

👤Tom Allen, Extension Plant Pathologist 🕔13:44, 29.May 2015

Over the past several years a root disease of soybean has been observed throughout MS as well as adjacent states. Presently, research is being conducted to determine the causal organism(s) involved in the disease. On Wednesday (May 27), plants in several fields were observed throughout the Inverness as well as Leflore County (Quito) area. The fields have historically had an issue with this particular root disease. Some of the general symptoms and signs of the disease and a general update regarding research project are included in this particular post.

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