Field and silage corn-Seedcorn maggot

Delia platura

Pest description and crop damage A small white maggot that attacks germinating seeds. Kills seedlings and reduces stands, occasionally so severely that they need replanting. Damage is most severe when corn is planted early in the season, and germination and seedling emergence are delayed.

Management-chemical control

Typically, best and most economic control is achieved with insecticide-treated seed.

  • beta-cyfluthrin (Baythroid XL) at 0.015 to 0.02 oz ai/1,000 row ft. PHI 0 days for forage and 21 days for grain or fodder. REI 12 hr. Do not exceed 0.088 lb ai/a per season.
  • bifenthrin (Brigade 2EC, Sniper, Capture LFR) at 0.0023 to 0.0046 lb ai/1,000 row ft over open seed furrow; 0.047 to 0.062 lb ai/a pre-plant incorporated. PHI 30 days for harvest, grazing, or cutting for feed. REI 12 hr. Do not exceed 0.1 lb ai/a per season as an at plant application. Do not apply Capture LFR as foliar treatment.
  • bifenthrin/indol butyric acid (Empower 2) at 0.002 to 0.006 lb ai/1,000 row ft in furrow. PHI 30 days. REI 24 hr. Do not exceed 0.3 lb ai/a foliar and at planting.
  • bifenthrin/zeta-cypermethrin (Hero) at 0.04 to 0.1 lb ai/a in furrow. PHI 30 days grain and stover; 60 days forage. REI 12 hr. Do not graze for 30 days after treatment. Do not exceed 0.4 lb ai/a per season.
  • chlorethoxyfos/bifenthrin (Smart Choice 5G) at 0.2 to 0.25 oz ai/1,000 row ft. REI 2 days, or 3 days where annual rainfall is less than 25 inches. T-band over the row or apply in furrow. Apply with Smartbox system. Do not exceed one application per year.
  • chlorpyrifos (Lorsban 15G) at 0.075 lb ai/1,000 row ft at planting. Apply as a band or an in-furrow treatment at planting. PHI 21. REI 24 hr. Do not exceed 0.15 lb ai/1,000 row ft or 2 lb ai/a per season.
  • cyfluthrin (Tombstone) at 0.03 to 0.04 oz ai/1,000 row ft. PHI 0 days for green forage and 21 days for grain or fodder. REI 12 hr. Do not exceed 0.175 lb ai/a per season.
  • gamma-cyhalothrin (Declare) at 0.0025 lb ai/1,000 row ft at planting. REI 12 hr. Do not exceed 0.06 lb ai/a from at plant and foliar treatments.
  • lambda-cyhalothrin (Warrior II) at 0.005 lb/1,000 row ft. 21 days. REI 24 hr. Do not apply more than 0.12 lb ai/a per season at plant or foliar applications.
  • permethrin (Loveland Permethrin) at 0.1 to 0.15 lb ai/a pre-plant incorporated, pre-emergence or at planting. PHI 0 days for forage, 30 days for grain harvest or fodder (stover). REI 12 hr. As preemergent, apply from 5 days before planting up to crop emergence. Apply in furrow or as band at planting.
  • phorate (Thimet 20G) 0.056 to 0.075 lb ai/1,000 row ft at planting or cultivation, broadcast or banded but not in-furrow. REI 48 hr. Limit one application.
  • tefluthrin (Force 3G) at 0.0075 to 0.0094 lb ai/1,000 row ft. T-band or in-furrow at planting. REI 0 hr. Do not exceed 0.327 lb ai/a per year. Use only once per season.
  • terbufos (Counter 15G) at 0.056 to 0.075 lb ai/1,000 row ft. REI 48 hr or 72 hr if annual rainfall is less than 25 inches. Band or furrow at planting.

Seed treatments

  • abamectin/thiamethoxam (Avicta Duo Corn)-Apply as slurry to corn seed. Consult label.
  • abamectin/thiamethoxam/azoxystrobin (Avicta Complete)-Refer to label for instructions.
  • chlorpyrifos (Lorsban 50W) seed treatment at 1 oz ai/100 lb seed. Use as slurry treatment before planting.
  • clothianidin (Poncho 600) at 0.25 to 0.5 mg ai/kernel. Commercial treaters only.
  • clothianidin/Bacillus firmus (Poncho Votivo) at 0.5 mg ai/seed. Do not exceed 0.5 mg ai/seed.
  • imidacloprid/carboxin/metalaxyl (Latitude Seed Treatment) at 1.5 oz product per 42 lb of seed. Use as a dry mixture in the planter box as a seed treatment prior to planting. See label for complete instructions. REI 24 hr.
  • imidacloprid (Gaucho 600)-Refer to label. REI 24 hr.
  • permethrin/carboxin (Kernel Guard Supreme) at 1.5 oz canister per 42 lb seed. Apply to seed at planting time with canister applicator tube system. REI 12 hr. Do not graze or feed livestock on treated areas for six weeks after planting.
  • thiamethoxam (Cruiser 5FS). Commercial treaters only. See label instructions.