The corn disease season continues to be somewhat quiet. Few if any foliar diseases have been observed throughout MS. Southern rust continues to be observed in western and southern MS; however, the disease has only be observed at low levels (one to two leaves) in all situations to date.
Over the past several years, phytotoxicity has continued to be an important topic of conversation. Phytotoxicity can ultimately result following the application of numerous fungicide products. The specific symptoms associated with phytotoxicity can appear as interveinal chlorosis (either mild, moderate
The North Mississippi Research and Extension Center Field Day is scheduled for August 11, 2016 from 8 am to 1:30 pm with lunch provided.
Numerous fungicide trials were conducted during 2015 to determine the efficacy of fungicides on frogeye leaf spot. Included in this post are the majority of the soybean fungicide trials conducted at R2, R3, and R5 in Stoneville, MS on a FLS-susceptible soybean variety. A total 39 different product or product combinations were evaluated. A summary table is included to highlight a specific product and the trials that particular product was included in.
The entries contained in the MSU soybean OVT were screened for their sensitivity to the root-knot nematode during 2015. Contained within this blog post are the root galling responses of 133 entries as well as the yield from the RKN infested location.
Soybean diseases continue to be observed throughout the MS soybean production system. Over the past several weeks calls have centered on Septoria brown spot, Southern blight, and some limited questions regarding soybean rust.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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
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).
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.
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
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.
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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