Darcy Telenko

First southern rust of the year in Hinds County, MS. Thankfully, the vast majority of the corn in MS is beyond a stage where southern rust could impact yield @MSUExtService @MSUextPlantLab @MississippiCorn

Common rust on corn in Alabama. Not a significant problem. We still have not confirmed southern corn rust, though we have eye’s in the field. Common rust appears as powdery, elongated, brick-red to cinnamon-brown pustules that erupt on both sides of the leaves @CropNetwork

“Fungicide applications remain an effective tool for reducing white mold levels if applied between the R1 and R3 growth stages. Not all fungicide products are equally effective at controlling white mold, with Endura® remaining the most effective product if applied between the correct growth stages.” From the @PlantDiseaseJ article cropprotectionnetwork.org/publications/m… by @BisonBeanDoc @mitch_roth12 @dsmuelle @MartinChilvers1 @DTelenko @SpartySpudNBeet @badgerbean @badgercropdoc +more #soybeans #USSoy

Gray leaf spot of corn occurs virtually every growing season and is often more severe in corn following corn. Disease is favored by warm (80s°F), humid (>90% for 12+ hours) weather. Severity depends on hybrid susceptibility and environment. Resistant hybrids are available. Crop rotation and tillage reduce fungus survival. Foliar fungicides are available, but are less likely to be profitable if disease risk is low. Ask state Extension for more information.@DTelenko @alisonrISU @NDSUExtension @BorisCamiletti @MandyBish1 @maddishires @alabamaED @baldpathologist @MahDuffeck @DaisyHAhumada @MartinChilvers1 @badgercropdoc @YuanZeng3 @travisfaske @ppp_trey #corn #grow26 @NationalCorn

“Stem canker can cause premature death of soybean in large areas of the field...The greatest impact on yield occurs when plants are infected early during the vegetative stages, and favorable weather conditions persist until later reproductive growth stages...” From the revised publication An Overview of Stem Canker at cropprotectionnetwork.org/publications/a… by @cropdoc08 @cropdisease @MartinChilvers1 @NCLegumeLady @DylanMangel @febina_m @dsmuelle @maddishires @badgercropdoc @AlbertTenuta @baldpathologist @MandyBish1 @MahDuffeck @travisfaske @alisonrISU @DTelenko @BisonBeanDoc +more #soybean #agtwitter #agx #grow26 #USSoy

"Most fungicides resulted in greater breakeven probabilities with increasing disease severity. The results emphasize that fungicide applications occurring at VT/R1 and when disease severity exceeds 5% are more likely to result in a positive economic gain." From the @phytofrontiers article at doi.org/10.1094/PHYTOF…. By @NabinKDangal @badgercropdoc @baldpathologist @MandyBish1 @kmbiss @MartinChilvers1 @travisfaske @NDSUcerealpath @AG__McCoy @dsmuelle @rodrigobonofre @ppp_trey @alisonrISU @alabamaED @DTelenko @AlbertTenuta @cropdoc08 +others. #corn #fungicide #ROI @plantdisease

"In conclusion, both seed treatments and [moderately resistant] cultivars performed well in reducing [sudden death syndrome] across a wide array of environmental conditions and disease pressures." From the @PlantDiseaseJ article doi.org/10.1094/PDIS-0… by @NabinKDangal @MandyBish1 @kmbiss @cropdisease @MartinChilvers1 @travisfaske @FusariumWranglr @febina_m @OnofreLab @badgercropdoc @DTelenko @AlbertTenuta @dsmuelle +more @plantdisease @MSSOY @ILSoybean #soybean #SDS #USSoy

Crop disease forecasting and risk tool at cropprotectionnetwork.org/crop-disease-f…. Data for tar spot, gray leaf spot, white mold, and more. @badgercropdoc @Ag_PMT @DTelenko @baldpathologist @SpurlockLab @YuanZeng3 @travisfaske @ppp_trey @MartinChilvers1 @alisonrISU @alabamaED @DylanMangel @BisonBeanDoc #corn #soybean

“Chemical management strategies do not result in complete control of white mold and...should be considered only as one component of an integrated management program. Reduction of white mold incidence achieved by fungicides in university field trials has ranged from zero to approximately 60%.” From the updated publication An Overview of White Mold at cropprotectionnetwork.org/publications/a… by @badgercropdoc @cropdisease @MartinChilvers1 @travisfaske @DylanMangel @dsmuelle @ISU_IPM @BisonBeanDoc @cropdoc08 +more @AlbertTenuta @baldpathologist @MandyBish1 @MahDuffeck @maddishires @DTelenko #soybeans #USSoy

For tar spot, fungicide timing is very important. In most years, a fungicide is not needed prior to the V10 growth stage. One well-timed (VT-R3 growth stages) fungicide will be sufficient to manage tar spot in most instances. Even in years where two applications appear to improve tar spot control, improved ROI is marginal over a single well-timed application. It is best to use scouting and/or tar spot risk or profit tools to make informed decisions about when to apply fungicides for tar spot. Read more at cropprotectionnetwork.org/publications/f…. From Extension. @DTelenko @cropdoc08 @alisonrISU @badgercropdoc @AlbertTenuta @MartinChilvers1 @dsmuelle @travisfaske #corn #tarspot #fungicide

How to Effectively Use Premix Fungicides for Long-Term Disease Control at youtu.be/-BrcruJ8FiE?si…. From @txextension's Nolan Anderson. @txresearch @TexasDeptofAg @AgriLife @TexasCorn @aglifesciences #fungicides #fungicide #corn #soybean

Fungicide ROI calculators for corn, soybean white mold, and alfalfa at cropprotectionnetwork.org/roi-calculators. @Ag_PMT @badgercropdoc @datascience_uw @MartinChilvers1 @DTelenko @BisonBeanDoc @hoperbecton @baldpathologist @travisfaske @alabamaED @alisonrISU @ppp_trey @DylanMangel @SpurlockLab @MandyBish1 @maddishires @YuanZeng3 #corn #soybeans #alfalfa #fungicide #grow26

Thanks for the update, @Talon_Mues. Here is a reminder for folks out scouting that not all tar-like spots on corn are tar spot.

“More often than not, it is assumed that interveinal chlorosis indicates the presence of soybean sudden death syndrome (SDS). However, there are several additional diseases and disorders that can cause interveinal chlorosis in soybean besides SDS. Some of these diseases are new to the U.S. and Canada, or are expanding into new regions, which can complicate disease diagnosis.” From Diagnosing Interveinal Chlorosis in Soybeans — it's not just SDS at doi.org/10.31274/cpn-2… by @cropdoc08 @baldpathologist @BorisCamiletti @febina_m & @dsmuelle. @DTelenko @DylanMangel @BisonBeanDoc @badgercropdoc @MartinChilvers1 @alabamaED @MandyBish1 @maddishires @travisfaske @ppp_trey @MahDuffeck #soybean #USSoy

Tar spot season has officially begun in Indiana as we have confirmed the first few disease lesions in Randolph County. Here's a review of my top 10 tips and tools for 2026. indianafieldcroppathology.com/first-tar-spot… @CropNetwork @PurdueExtension @PurdueBPP @PurdueCorn @INCornFarmers

Red Crown Rot: Understanding its Impact and How to Manage it from Extension at youtu.be/_xvEv5_AsVw. @DTelenko @BorisCamiletti @cropdisease @MartinChilvers1 @MandyBish1 @baldpathologist @ILSoybean @missourisoybean #soybean #soy #grow26 #USSoy

These are not tar spot. For tar spot prediction data near your farm, check out the Forecasting Tool at cropprotectionnetwork.org/crop-disease-f…. @badgercropdoc @MartinChilvers1 @baldpathologist @alisonrISU @MandyBish1 @maddishires @NDSUExtension @DTelenko @YuanZeng3 @OnofreLab @AlbertTenuta #tarspot #corn

“Fungicide applications remain an effective tool for reducing white mold levels if applied between the R1 and R3 growth stages. Not all fungicide products are equally effective at controlling white mold, with Endura® remaining the most effective product if applied between the correct growth stages.” From the @PlantDiseaseJ article cropprotectionnetwork.org/publications/m… by @BisonBeanDoc @mitch_roth12 @dsmuelle @MartinChilvers1 @DTelenko @SpartySpudNBeet @badgerbean @badgercropdoc +more #soybeans #whitemold #grow25 #agtwitter #agx #USSoy

Scouting for Soybean Stem Diseases pub from Extension at cropprotectionnetwork.org/publications/s…. @cropdoc08 @baldpathologist @cropdisease @BorisCamiletti @MartinChilvers1 @DylanMangel @dsmuelle @badgercropdoc @AlbertTenuta @DTelenko @UMNExt @BisonBeanDoc @travisfaske @MandyBish1 +others #soybeans #AgTwitter #USSoy

Track disease and insect movement at cropprotectionnetwork.org/maps. Keep tabs on▪️southern rust▪️red crown rot▪️reniform nematode▪️root-knot nematode▪️stripe rust From Extension. @DTelenko @tjcksn @BorisCamiletti @bobkemerait @alisonrISU @badgercropdoc @MandyBish1 @maddishires @MartinChilvers1 @ashmfaris @baldpathologist @cropdoc08 @dsmuelle @DylanMangel @NDSUcerealpath @AlbertTenuta @DaisyHAhumada @YuanZeng3 @PACropDoc @TNplantDR #soybean #corn #wheat #agx #grow26