Seedcorn Maggot

Overview

Seedcorn maggot (Delia platura) is a common pest that can cause significant damage to corn crops. By feeding on germinating seeds and young seedlings, its presence typically leads to stunted growth, reduced vigor, uneven stands, delayed crop emergence and lower yields. Weakened plants are also then more susceptible to disease and other stressors.

(Image Credit: Art Cushman, USDA Systematics Entomology Laboratory, Bugwood.org)

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How to Identify Seedcorn Maggot

Identifying seedcorn maggot can be challenging, but there are key indicators to look out for, including:

  • Wilted or dead seedlings, especially in moist areas, may indicate seedcorn maggot feeding on the roots

  • Discolored or rotting seeds are also a clue, as seedcorn maggots feed on germinating seeds, causing them to decay

  • Small, white maggots can often be found in the soil near damaged plants

Regions Typically Affected by Seedcorn Maggot

Seedcorn maggot tends to be more prevalent in areas with cooler climates and heavy, poorly drained soils. The Midwest, including states like Iowa, Illinois and Indiana, is particularly susceptible.

(Image Credit: Howard F. Schwartz, Colorado State University, Bugwood.org)

When Does Seedcorn Maggot Affect Crops?

Typically appearing during the early season when soil temperatures fall within the range of 50°F to 86°F (10°C to 30°C), seedcorn maggots are particularly active in the first few weeks after planting.

How to Manage Seedcorn Maggot Infestations

Implement good agricultural practices such as proper crop rotation, timely planting, and maintaining optimal soil moisture levels. There are no rescue treatments for seedcorn maggot control in corn. Fields with a high risk of economic injury from seedcorn maggots may consider seed-applied or in-furrow insecticides.

When deciding whether to employ chemical products to control maggots, farmers should first assess the severity of the infestation and determine the economic threshold for treatment. In cases where infestation levels are high, the use of insecticides can serve as a supplemental control measure.

One popular option is Willowood Lambda-Cy 1EC**, an insecticide containing lambda-cyhalothrin, which is labeled for use on corn specifically for seedcorn maggot control.

Another option is GCS Bifenthrin 2EC**, which is another insecticide containing bifenthrin with similar label applications against seedcorn maggot.

Disclaimer

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Every product that labels SEEDCORN MAGGOT as a weed, pest, or disease the product can be applied against is shown below. Click any product for label and more information.
Acceleron® I-374 Insecticide Seed TreatmentAcceleron® I-609 Insecticide Seed TreatmentAcceleron® IC-609Acceleron® IDL-810Acceleron® IX-409Acceleron® IX-409 Insecticide Seed TreatmentAcenthrin™Adage™Adage™ STAnnex® LFR®Arctic® 3.2 ECAttendant® 480 FSAttendant® 600 FSAvicta® Complete Beans 500Avicta® Complete Corn 250Avicta® Duo CornAxcess™ Insecticide Seed TreatmentAztec® 2.1% Granular InsecticideAztec® 4.67 GAztec® HCAztec® HC SmartCartridge™Aztec® SmartBox® 4.67 GBatallion™ 2 ECBatallion™ LFCBaythroid® XLBi-Dash 2EBifen 2 AG GoldBifen 25% ECBifender® FC InsecticideBifenthrin 2EC InsecticideBifenture® ECBifenture® LFCBolton™Brigade® 2EC Insecticide/MiticideCapture® 2EC-CALCapture® 3RIVE 3DCapture® LFR®Cavalry™ IIChlorpyrifos 15GChlorpyrifos 4E-AG (Drexel)Clariva® Elite BeansCobalt® AdvancedCobalt® InsecticideConcur® Seed TreatmentCounter® 15-G Lock'n Load®Counter® 15G Smartbox®Counter® 20G Lock'n Load®Counter® 20G Smartbox®Counter® 20G SmartCartridge®Cruiser® 5FSCruiserMaxx®CruiserMaxx® AdvancedCruiserMaxx® APXCruiserMaxx® APX UncoloredCruiserMaxx® EZCruiserMaxx® PlusCruiserMaxx® Vibrance®CruiserMaxx® Vibrance® PulsesCrusader 1ECCrusader 2MEDeclare® InsecticideDeclare® InsecticideDefcon® 4.67GDefcon™ 2.1GDiscipline® 2ECDiscipline® CADyna-Shield Conquest™Dyna-Shield® Imidacloprid 5Empower 2®Enhance® AWEquity® VIPEquity™Ethos® 3D Insecticide/FungicideEthos® Elite LFR® Insecticide/BiofungicideEthos® XB Insecticide/FungicideFanfare® 2ECFanfare® ECFanfare® ESFirestone™Force® 10G HL SmartBox®Force® 10G HL Smartcartridge™Force® 3GForce® 3G SmartBox®Force® 6.5GForce® CSForce® EvoFortenza®Fortress® 5G InsecticideFrenzy VelozGaucho® 600 FlowableGCS Bifenthrin 2ECGCS Bifenthrin LFCGovern® 4EGrizzly® TooGrizzly® Z InsecticideHatchet® InsecticideHelix XTra®Helix® Vibrance®Hero® EWHero® InsecticideIndex® Liquid At-Plant InsecticideINOVATE™ Seed ProtectantINOVATE™ System Kit (2 Pieces)INTEGO™ SUITE SoybeansINTEGO™ SUITE SystemKaiso® 24 WGKarate® InsecticideKarate® with Zeon™ TechnologyKendo® 22.8 CSKendo™ InsecticideKernel Guard® SupremeL - C InsecticideLambda TLambda-Cy AGLambda-Cy™ EC Insecticide-RUPLambdafos™ InsecticideLamcap® IILamcap™Lancer® FCLancer™ 2ECLatitude®Legend™ 5L STLegumeStar™ Select STLeverage® 360Lorsban® 15G Granular InsecticideLorsban® 15G Smartbox®Lorsban® 50W in Water Soluble Packets InsecticideLorsban® 75 WGLorsban® Advanced InsecticideLorsban®-4E InsecticideLumiderm®Lumiverd™Lumivia®Macho® 480 STMacho® 600 STManticor™ LFR® In-Furrow Fungicide/InsecticideMatch-Up™ InsecticideMustang® MaxxNipsIt INSIDE® InsecticideNitro Shield®Nitro Shield® IVNufarm Lambda-Cyhalothrin 1EC InsecticideNurizma™ InsecticideParadigm®Paradigm® VCPerm-UP® 3.2 ECPermaStar™ AG InsecticidePermethrinPermethrin 3.2 AGPermethrin 3.2 ECPermethrin 3.2 EC (70506-9-5905)Poncho® 600 Seed TreatmentPoncho® VOTiVO®Poncho® Votivo® Precise Seed TreatmentPoncho® Votivo® Seed TreatmentPoncho® XC Seed TreatmentPounce® 1.5GPrecept™ InsecticideProaxis® InsecticideProaxis® InsecticideProaxis™Province® IIProvince™Ravage®Regard® SCResonate™ 480 STResonate™ 600 STReveal®Reveal® CAReveal® Endurx™Revere® 2.0Revize® Imida STRuckus™ LFR® InsecticideSaurus™Seed Shield® BeansSeed Shield® SoybeanSeguroSenator® 600 FSSepresto 75 WSSerpent™ 1 ECSharda Imidacloprid 5SCSilencer®Silencer® VXN™SlugbugSmartChoice® HCSmartChoice™ 5G Lock 'n LoadSmartChoice™ 5G SmartBoxSniper®Sniper® Helios®Sniper® LFR®SoyStar™ Elite STSoyStar™ Premier STSoyStar™ Select STSoyStar™ Supreme STSpirato® IMTm 348 FSSTartUP™ BIFEN Seed TreatmentSTartUP™ IMIDA Seed TreatmentSteed® InsecticideSultrus™Tailgunner™Temitry™ LFR®Tenkoz® Permethrin 3.2 ECTepera® PlusTepera® Plus HDTepera® Plus HDThimet® 20-G EZ Load®Thimet® 20-G Lock 'N Load®Thimet® 20-G SmartBox®Tombstone™Tombstone™ Helios®Tundra® EC (1381-196)Tundra® LFCTundra® SupremeUpShot™ Soybean Seed TreatmentVerimark®Verimark® Insect ControlVoltage Endurx®Vulcan®Warden® CXWarden® CX IIWarhawk®Warhawk® ClearForm®Warrior II with Zeon Technology®Whirlwind®Willowood Bifenthrin 2ECWillowood Imidacloprid 4STWillowood Lambda 1ECWillowood Lambda-Cy 1ECXpedient® Plus™Xpedient® Plus™ VYuma® 4E