Maíra Duffeck 🌾🍄🦠🔎🔬💻📊👩‍🔬👩🏼‍💻

After 10 years on “Twitter” I’ve reached 10,000 followers! I’m grateful to use this platform to share information on plant diseases and management strategies with stakeholders. Thank you to everyone who follows, engages, and helps spread science-based knowledge 🌱🌽🥜🍄🧬🦠

Gray leaf spot and bacterial leaf streak can look similar on corn leaves, but management is different. Fungicides work against gray leaf spot, but not bacterial leaf streak. Both diseases produce long lesions between leaf veins. Gray leaf spot lesions are rectangular with straight edges. Bacterial leaf streak lesions are tan to brown with wavy margins. A helpful diagnostic trick: hold the leaf up to the light. Bacterial lesions often show bright yellow halos, unlike gray leaf spot. #corn #grow26 #agx @alisonrISU @maddishires @MahDuffeck @MandyBish1 @baldpathologist @MartinChilvers1 @badgercropdoc @UNL_CropWatch @NeCGA @iowa_corn @sdcorn

Updated information on the management of Corn leafhopper and Corn stunt in the U.S.

Our latest study on the early spread of the corn stunt disease complex in southern Brazil is now published! Our findings provide insights into disease spread under conditions typical of smallholder farming systems. rdcu.be/fq1Lb #CornStunt #Epidemiology @EpagriOficial

Diplodia leaf streak can produce lesions 12” and longer. Only the second time I’ve run across them this long. Remember that NCLB lesions tend to be 2-4” in length. The other major difference would be the presence of pycnidia producing chains of conidia in DLS lesions #mscrops

Multiple management options are available for northern corn leaf blight. One of the most effective options is to plant less susceptible hybrids. Foliar and at-plant fungicides are available. Preventive fungicide applications are most effective, and foliar fungicide timings targeting tasseling/silking (VT/R1) have been most successful at reducing disease compared to a non-treated control. Read more at cropprotectionnetwork.org/publications/a…. From @cropdoc08 @ppp_trey @alisonrISU @AlbertTenuta @baldpathologist @MahDuffeck @travisfaske @dsmuelle @badgercropdoc +others #corn #disease

Two days of corn field calls means we went from quiet to some diseases present. Don’t confuse Diplodia leaf streak (short lesion) with NCLB (longer). Lesions are generally shorter, and Diplodia produces pycnidia (pepper grains) in the leaf (close-up photo w/out pen) #mscrops

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

“Effective management of soybean stem diseases starts with proper identification. Symptoms typically appear in the mid to late reproductive stages of soybean.” From the Scouting for Soybean Stem Diseases publication at cropprotectionnetwork.org/publications/s… by @cropdoc08 @baldpathologist @cropdisease @BorisCamiletti @MartinChilvers1 @DylanMangel @febina_m @dsmuelle @badgercropdoc @AlbertTenuta @DTelenko @BisonBeanDoc @travisfaske @MandyBish1 +more @MahDuffeck @MSSOY @MSUEFieldCrops @WISoyCheckoff @Ohiosoycouncil @NESoybeanBoard @missourisoybean @ILSoybean @KsSoybean @alabamaED #USSoy

The GOALLLLLLL is RAINNNNNNN! Possible severe weather today and tomorrow, too. Rain chances are higher as we get into the weekend and early next week. ticker.mesonet.org #okwx #okmesonet

Corn Leafhopper made its first appearance of the 2026 growing season in OK, with 1 insect per 150 scouted plants 🌽 🚨 Corn growers 🚨 🌽 It’s time to scout the fields and be ready for the insect’s management More information below: extension.okstate.edu/e-pest-alerts/…

First report of Maize bushy stunt in Oklahoma Candidatus Phytoplasma asteris is one of the pathogens involved with the Corn Stunt complex in the state 🌽🌽🌽🌽🌽🌽🌽🌽 apsjournals.apsnet.org/doi/10.1094/PD…

Thanks @baldpathologist for contributing with the monitoring efforts to the corn leafhopper and corn stunt disease in the southern U.S.

Maps for the Corn leafhopper and Corn stunt pathogens distribution in the U.S. available at @CropNetwork

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

Yield losses can range from 10 to 80% if susceptible cotton cultivars are grown in fields with high densities of reniform nematode. Get ID and management info on reniform nematode in the overview publication from Extension at cropprotectionnetwork.org/publications/a…. From @travisfaske @LSUNematology @UFcropnematodes @txextension @baldpathologist @ccecornell @MahDuffeck @IanMSmall1 @MandyBish1 @cottoninc @TheSCNCoalition @NematodeGuy @alabamaED @UFEntNem #cotton @PCGNews @kmbiss @ppp_trey

Our upcoming webinar in the Virology – Then & Now series has been rescheduled. Explore emerging cases in cassava and maize on June 2. Featuring insights from Linda Hanley-Bowdoin and Jennifer Wilson. Register: bit.ly/46NbQpr #planthealth #webinar #virology

Visit the Crop Protection Network booth at #NCBESA26 in Des Moines, Iowa! Free insect stickers and leaf defoliation key chains. Get a copy of "Bugs Don't Use Spoons" for filling out a short needs-assessment survey. @EntsocAmerica @KStateEntom @UMN_Entomology #insects #bugs

Crop growth, disease, weeds, insect pests, disorders, cover crops and tons more. Watch 40+ Crop Scout School episodes at cropprotectionnetwork.org/crop-scouting-…. From Extension. @MartinChilvers1 @thrashnbugs @NDSUExtension @badgerbean @cropdoc08 @PurdueCorn @cropstressOSU @StepUpSoy @BisonBeanDoc @LSUNematology @ScottGraham72 @PurdueSoybean @TravisLegleiter @justinmcmechan @ashleyn_dean @lancasarah #corn #soybean #wheat #cotton #alfalfa

@1brybry88 @planthealthprog Hey Bryan… I haven’t been able to isolate the pathogen yet from Oklahoma crops. If you see symptoms during this growing season, please give me a call 📞

@planthealthprog @MahDuffeck We see way too much of this in Oklahoma corn and milo. How can we prevent or treat for #Pantoea?

Ken Obasa and Dennis Coker identified a disease caused by #Pantoea agglomerans affecting corn and sorghum that can closely resemble iron deficiency, potentially leading farmers to apply costly nutrient treatments that do not address the underlying problem: doi.org/10.1094/PHP-07…