Johnsongrass

Overview

Johnsongrass, also known as Sorghum halepense, is more than just an invasive weed; it's a become a global menace for soybean farmers. This aggressive weed battles soybean for crucial resources like nutrients, water, and sunlight, leading to diminished crop yield and quality. Moreover, johnsongrass acts as a host for various pests and diseases, amplifying the susceptibility of soybean crops to these threats.

Johnsongrass competes with soybean for essential resources, causing stunted growth and reduced yield. It can also physically impede the growth of soybean plants by overshadowing them and blocking sunlight. Additionally, johnsongrass can harbor various pests and diseases, increasing the vulnerability of soybean crops to these threats.

(Image Credit: Steve Dewey, Utah State University, Bugwood.org)

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How to Identify Johnsongrass

Johnsongrass stands tall and robust, often towering over 6 feet. It boasts a thick, coarse stem and broad, lance-shaped leaves that can extend up to 2 feet. The plant flaunts large, purplish seed heads that are hard to miss.

Johnsongrass' extensive, creeping rhizome system is a significant indicator of its presence. These underground stems enable the plant to spread quickly and endure unfavorable conditions. The rhizomes, coupled with the plant's characteristic seed heads, are strong signs of a johnsongrass invasion.

Johnsongrass can be identified by its towering growth, broad leaves, and large seed heads. However, the most conclusive identification hinges on the plant's rhizome system. These creeping underground stems are white to cream-colored and end in sharp points.

(Image Credit: John D. Byrd, Mississippi State University, Bugwood.org)

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Johnsongrass Geography

Johnsongrass is a versatile weed that can prosper in diverse environments. While it's commonly found in the southern United States, it has spread globally. It favors warm, temperate climates and is often spotted in disturbed areas like fields, roadsides, and ditches.

Timing of Johnsongrass Emergence

Johnsongrass typically emerges early in the growing season. However, thanks to its rhizomes, it survives year-round, posing a persistent problem for farmers.

How to Manage Johnsongrass in Soybeans

An integrated approach for controlling johnsongrass in soybeans is preferred; that includes using soil-applied herbicides, post-emergence herbicides, crop rotation, and tillage for the most effective control. Multiple post-emergence herbicide applications may be necessary to control regrowth of rhizome johnsongrass.

Post-emergence

Burndown

Pendimethalin 3.80 Value Pick can be applied pre-plant to provide moderate control of seedling johnsongrass, but post-emergence applications are required for season-long control.

Remember to always read and follow the product labels for proper application rates and safety precautions.

By understanding johnsongrass and its impact on soybeans, you can take informed steps to protect your crops and ensure a successful harvest.

Disclaimer

© 2014 - 2024 Farmer's Business Network, Inc. All rights Reserved. The sprout logo, “Farmers Business Network”, “FBN”, “FBN Direct” are trademarks or registered trademarks of Farmer's Business Network, Inc. This content was written by Norm℠, reviewed and edited by Mikaela Tierney.

This content was generated with the assistance of Norm℠, FBN’s artificial intelligence (AI) Ag Advisor, based on a dataset of information containing general industry best practices and research. The AI model did not use specific external sources to generate this content. Our process involves using AI to aid human subject matter experts with the initial drafting and/or refinement of content.

The information and content provided is believed to be reliable, but its accuracy is not guaranteed. The content is provided for informational purposes only. It is not intended to be a substitute for specific agronomic, business, or professional advice, and should not be relied upon as such.

Every product that labels JOHNSONGRASS as a weed, pest, or disease the product can be applied against is shown below. Click any product for label and more information.
Abundit® EdgeAbundit® EdgeAbundit™ Extra (Exclusively Distributed by DuPont)Accent® HerbicideAccord® Concentrate HerbicideAccord® XRT HerbicideAccord® XRT II HerbicideAcifin™ 2LAcuron® GTAggressor®Aggressor® AXAlecto™ 41SAlligare Imazapyr 2 SLAlligare Imazapyr 4 SLAlligare Rotary 2 SLAqua Star®Aquamaster®AquaNeat® Aquatic HerbicideAquesta™ 4 FArrow 2ECArroz 80®Arsenal® herbicideArsenal® herbicide Applicators ConcentrateArsenal® PowerLine™ herbicideArtillery™ WSPAssure® II HerbicideAssure® II HerbicideAsulam 3.3Asulam 4FAsulam HerbicideAsulox®Autonomy™ HerbicideAvalanche® UltraAvatar™Avatar™ S2™Axill Solutions Clethodim 2ECAxill Solutions Glufosinate 280SLBallast™Bayonet® 2Beacon® HerbicideBeyond® herbicideBeyond® Xtra herbicideBrahma 44Bromacil 80Bromacil/Diuron 40/40Buccaneer® (55467-10)Buccaneer® 5Buccaneer® 5 ExtraBuccaneer® Plus (55467-9)Cadre® herbicideCallisto® GTCavalcade® PQCelebrity® PlusCelsius® WGCeridian™ 2 ECCertainty® Turf HerbicideCertainty® Turf HerbicideCharger 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Pro Grass and Weed KillerGlyfine™ PlusGlyfos® Aquatic HerbicideGlyfos® X-TRA HerbicideGlyphogan® HerbicideGlyphogan® Plus HerbicideGlyphosate 4 PlusGlyphosate 5.4HABITAT® herbicideHalex® GTHelosate® 75 SGHelosate® Plus AdvancedHerbivore® HerbicideHighcard™Honcho® HerbicideHoncho® K6 HerbicideHoncho® K6 Herbicide (Monsanto)Honcho® PlusHoss® UltraHyvar® XHyvar® XHyvar® X CropHyvar® X-LHyvar® X-LIgnite® 280 SLImazethapyr 2 SLImiFlex™Imitator® 18% ConcentrateImitator® 25% ConcentrateImitator® AquaticImitator® PlusImox™Impact®Impose®Inflame™ 280 SLIntensaIntensity Post- Emergence Grass Herbicide®Intensity® One Post-Emergence Grass HerbicideInterline® HerbicideIntermoc™K-Pam® HLKleenUp® Pro HerbicideKrovar® DF Crop HerbicideKrovar® I DFKrovar® I DF HerbicideKrovar® IVMLambient™Landmark® XPLandmaster® BWLandmaster® II HerbicideLiberty® 280 SLLiberty® 280 SL HerbicideLifeline®Lifeline® GTLightning® HerbicideLineage® Clearstand® HerbicideMad Dog®Mad Dog® 5.4Mad Dog® PlusMainline™Makaze Yield Pro®Makaze® HerbicideMaverick®Maxunitech Sulfentrazone 4 SC HerbicideMeso Star PlusMetam CLR™ 42%Metam KLR™ 54%Mirage® (524-445-34704)Moccasin™ II PlusMojave 70 EGMSMA 6 PlusMSMA 6.6Northstar® HerbicideNoventa™ HerbicideNufarm Imazapic 2SLNufarm Imazapic 2SL IVM HerbicideNufarm Imazuron™ HerbicideNufarm Leopard™ HerbicideNufarm Polaris® AC Complete HerbicideNufarm Polaris® AC HerbicideNufarm Polaris® HerbicideNufarm Polaris® SPOctivio™Octivio™ PulseOmni® Brand Clethodim 2 ECOpportunityOpTill® powered by Kixor® herbicideOpTill® PRO Herbicide (Liquid)OpTill® PRO powered by Kixor® herbicideOrnamec® 170 Grass HerbicideOrnamec® Over-The-Top Grass HerbicideOust® ExtraOust® ExtraOust® XPOust® XPOutrider®Outrider® HerbicidePanoramic® 2SLPanther® Pro HerbicideParrot™ 4LPastora®Pemex™Plateau® herbicidePoast Plus® herbicidePoast® herbicidePramitol® 25EPramitol® 25EPramitol® 25EPramitol® 25E HerbicidePraxisPraxis PlusPRE-Tector™ Plus ECPrimero®Priority® GTProDeuce®Promote™Provisia® 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(RUP)Section® 2EC (1381-204)Section® 2EC (42750-72-1381)Section® Three HerbicideSelect Max® Herbicide with Inside Technology™Select® 2 ECSelect® 2 EC HerbicideSequence®Shadow®Shadow® 3ECShar-Max Glyphosate 41% SLShowdown® HerbicideSolicam® DF HerbicideSolicam® DF HerbicideSparrow™Spartan® 4FSpartan® FL 4FSpirit® HerbicideSpyder® Extra Selective HerbicideSpyder® Selective HerbicideStadia™Steadfast®Steadfast® QSteadfast® QStout®SufficeSulfentrazone 4LSulfin® 4SCSunphosate 41%Sunphosate 5 MAX (Wynca)Surmise®Surmise® 5Sweep® HerbicideTackle® HerbicideTapout®Targa®Target® 6 PlusTenkoz® Trifluralin 4 EC (62719-250-55467)Thunder Master®Thunder®Tide Glufosinate 280 SLTide USA Clethodim 2ECTop Deck™ Aquatic HerbicideTotal TNVTotal® 2.3Total® HerbicideTouchdown HiTech®Touchdown Total®Touchdown® CTTouchdown® HerbicideTraxion®Treflan® 4 EC HerbicideTreflan® HFP HerbicideTreflan® HFP HerbicideTreflan™ 4L HerbicideTrifluralin 10GTrifluralin 4 E.C.Trifluralin 4 EC HerbicideTrifluralin 4ECTrifluralin 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