Corn seed-Seedcorn maggot

Delia platura

Pest description and crop damage A small white maggot that attacks seed, germinating seeds, and seedlings. Seedlings that germinate usually die before maturation or are severely stunted. Seedcorn maggot-induced damage is facilitated by early planting dates, heavy cover crops, and cool-wet weather.

Management-chemical control

  • abamectin + thiamethoxam (Avicta Duo, other formulations of Avicta that also contain fungicides)-Only for use in certified seed treatment facilities. Applied as a slurry to corn seed. Consult label. (Groups 6 and 4A*)
  • beta-cyfluthrin (Baythroid XL) at 0.12 to 0.16 fl oz/1,000 row ft or 2.0 to 2.8 fl oz/a. Total mix volume should be applied in the open furrow ahead of the closing wheels. If crop residues are to be used for fodder, there is a 21 day PHI for grain or fodder (stover). REI 12 hr. Do not exceed 0.088 lb ai/a per season. Not for use on sweet corn seed. This product is highly toxic to bees exposed to direct treatment or residues on blooming crops or weeds. Do not apply this product or allow it to drift to blooming crops if bees are visiting the treatment area. (Group 3A)
  • bifenthrin (Bifenthrin 2EC, numerous products) at 0.0023 to 0.0046 lb ai/1,000 row ft at plant or 0.047 to 0.062 lb ai/a preplant. Extremely toxic to fish and aquatic invertebrates. Highly toxic to bees. PHI 30 days. REI 24 hr. Do not exceed 0.1 lb ai/a at plant. Bifenthrin is highly toxic to bees exposed to direct treatment or residues on blooming crops or weeds. Do not apply this product or allow it to drift to blooming crops if bees are visiting the treatment area. Extremely toxic to fish and aquatic invertebrates. (Group 3A)
  • bifenthrin/chlorethoxyfos (Smart Choice 5G) at 4.5 to 5 oz/1,000 row ft. REI 48 hr; 72 hr where annual rainfall is less than 25 inches. Smart Choice 5G must be applied with the SMARTBOX system. This product is highly toxic to bees and other pollinators exposed to direct treatment or residues on blooming crops or weeds. Do not apply this product or allow it to drift to blooming crops or weeds if bees or other pollinating insects are foraging in the treatment area. This product also is toxic to mammals, birds, fish, and aquatic invertebrates. (Groups 3A and 1B)
  • bifenthrin/zeta-cypermethrin (Hero) at 0.04 to 0.1 lb ai/a at plant. PHI 3 days for sweet corn seed. Do not graze livestock in treated areas or cut treated sweet corn seed crops for feed within 3 days of the last application. For non-sweet corn seed crops, there is a PHI of 30 days for crop residues harvested for stover; do not allow livestock to graze on crop residues for 30 days after treatment. REI 12 hr. Do not exceed 0.4 lb ai/a per season. (Group 3A)
  • bifenthrin/indole-3-butyric acid (Group 3A) (Empower II) at 0.002 to 0.006 lb ai/1,000 row ft. PHI 30 days. REI 24 hr. Do not exceed 0.1 lb ai/a at plant. Not for use on sweet corn seed. (Group 3A)
  • chlorpyrifos (numerous products) at 0.075 lb ai/1,000 ft of row at planting. PHI 21 days for grain and ears. REI 24 hr. Do not exceed 0.15 lb ai/1,000 row ft or 3 lb ai/a per season. Apply as an in-furrow treatment at planting. Apply only once per season as a soil treatment. Chlorpyrifos is highly toxic to bees and other pollinators exposed to direct treatment or residues on blooming crops or weeds. Do not apply this product or allow it to drift to blooming crops or weeds if bees or other pollinating insects are foraging in the treatment area. (Group 1B)
  • chlorpyrifos/gamma cyhalothrin (Cobalt) at 0.26 to 0.76 lb ai/a at planting. Do not apply within 21 days before harvest of grain, ears, forage or fodder. REI 24 hr. This product is highly toxic to bees and other pollinators exposed to direct treatment or residues on blooming crops or weeds. Do not apply this product or allow it to drift to blooming crops or weeds if bees or other pollinating insects are foraging in the treatment area. (Groups 1B and 3A)
  • cyfluthrin (Tombstone) at 0.12 to 0.16 fl oz/1,000 row ft or 2.0 to 2.8 fl oz/a. Total mix volume should be applied in the open furrow ahead of the closing wheels. PHI 21 days for grain or fodder. REI 12 hr. Do not exceed 0.175 lb ai/a per season. (Group 3A)
  • gamma-cyhalothrin (Declare) at 0.0025 lb ai/1,000 ft of row. PHI 21 days. Do not allow livestock to graze in treated areas within 1 day after last treatment. Do not feed treated corn fodder or silage to meat or dairy animals within 21 days after the last treatment. REI 24 hr. Do not exceed 0.06 lb ai/a per season. Refer to product labels for application limits if products containing gamma-cyhalothrin and products containing lambda-cyhalothrin are to be used in the same season. This product is highly toxic to bees and other pollinators exposed to direct treatment or residues on blooming crops or weeds. Do not apply this product or allow it to drift to blooming crops or weeds if bees or other pollinating insects are foraging in the treatment area. Extremely toxic to fish and aquatic organisms and toxic to wildlife. (Group 3A)
  • lambda-cyhalothrin (Warrior II; other products) at 0.005 lb ai/1,000 row ft. PHI 21 days. If crop residues are to be used for livestock, PHI is 1 day for grazing, 21 days for fodder or silage. REI 24 hr. Apply no more than 0.12 lb ai/a per season. Refer to product labels for application limits if products containing gamma-cyhalothrin and products containing lambda-cyhalothrin are to be used in the same season. Highly toxic to bees and other pollinators exposed to direct treatment or residues on blooming crops or weeds. Do not apply lambda-cyhalothrin or allow it to drift to blooming crops or weeds if bees or other pollinating insects are foraging in the treatment area. Lambda-cyhalothrin is extremely toxic to fish and aquatic organisms and toxic to wildlife. (Group 3A)
  • permethrin (numerous products) at 0.1 to 0.2 lb ai/a preemergence broadcast. Not for use on sweet corn seed. If crop residues are to be used for livestock, do not apply less than 30 days prior to harvest of grain or fodder (stover). REI 12 hr. Do not exceed 0.45 lb ai/a per season. Permethrin is highly toxic to bees exposed to direct treatment or residues on blooming crops or weeds. Do not apply this product or allow it to drift to blooming crops if bees are visiting the treatment area. Extremely toxic to aquatic organisms, (Group 3A)
  • tefluthrin (Force 3G and other formulations) at 0.0075 to 0.0094 lb ai/1,000 row ft, T-banded or in-furrow at planting. Do not exceed one application per season. REI 48 hr. This product is highly toxic to fish and aquatic invertebrates. (Group 3A)
  • terbufos (Counter 20G) at 0.056 to 0.075 lb ai/1,000 row ft. PHI 30 days forage or graze. REI 48 hr or 72 hr where average rainfall is less than 25 inches per year. Do not exceed 1.3 lb ai/a per season. Do not apply an ALS herbicide if Counter 20G has been applied at planting. Not for use on sweet corn seed. (Group 1B)
  • thiamethoxam (Cruiser 5FS, Cruiser Extreme)-Commercial seed treatments only. See label instructions. This product is toxic to wildlife and highly toxic to aquatic invertebrates. Thiamethoxam is highly toxic to bees exposed to direct treatment, and effects may be possible as a result of exposure to translocated residues in blooming crops. (Group 4A)

For more information

http://insect.pnwhandbooks.org/vegetable/vegetable-pests/common/vegetabl...