1. Insect
  2. Agronomic Crops
  3. Field and Silage Corn Pests

Field and silage corn-Grasshopper

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Several species

Pest description and crop damage Have caused extensive defoliation during some years.

Management-chemical control

  • alpha-cypermethrin (Fastac CS, Fastac EC) Group 3A insecticide at 0.017 to 0.025 lb ai/A. REI 12 hr. PHI 30 days grain and stover; 60 days forage. Retreatment interval 3 days. Do not exceed 0.075 lb ai/A per season.
  • azadirachtin (Neemix 4.5)-PHI 0 days. REI 12 hr. See label for rates. Slow acting. Apply early. Thorough coverage and repeat applications are necessary. Some formulations are OMRI-listed for organic use.
  • beta cyfluthrin (Baythroid XL) Group 3 insecticide at 0.017 to 0.022 lb ai/A (2.1 to 2.8 fl oz/A). PHI 0 days for green forage and 21 days for grain or fodder. REI 12 hr. Maximum 2.8 fl oz/A in 7-day interval. Do not exceed four applications or 0.088 lb ai/A per season.
  • bifenthrin (Brigade 2EC) Group 3A insecticide at 0.033 to 0.1 lb ai/A (2.1 to 6.4 fl oz/A). PHI 30 days for harvest, grazing, or cutting for feed. REI 12 hr. Do not apply more than 0.3 lb ai/A per season.
  • bifenthrin/chlorantraniliprole (Elevest) at 0.084 to 0.167 lb ai/A. REI 12 hr. PHI 30 days. No more than three applications per year. Do not apply more than a total of 0.2 lb ai/A of chlorantraniliprole and 0.3 lb ai/A of bifenthrin per year. Group 3A and 28. With foliar sprays, performance is improved with the addition of a Methylated Seed Oil (MSO) adjuvant at 1 gal per 100 gal of spray volume (1% v/v). Apply when grasshopper populations reach local established thresholds to prevent crop damage. Correct timing of spray applications to nymphal stages and thorough coverage is critical to achieve optimum control. Applications should be made when eggs have hatched and the majority of the grasshopper population is 2nd - 3rd instar nymphs. Once grasshoppers contact and/or ingest ELEVEST insect control there will be rapid feeding cessation. Do not make more than two sequential applications of ELEVEST insect control before rotating to another registered insecticide having a different mode of action.
  • bifenthrin/zeta-cypermethrin (Hero, Hero EW) Group 3A insecticide at 0.025 to 0.06 lb ai/A. PHI 30 days grain and stover; 60 days forage. REI 12 hr. Do not graze for 30 days after treatment. Do not exceed 0.099 lb/A zeta-cypermethrin and 0.398 lb/A bifenthrin per year.
  • carbaryl (Sevin 5 Bait) at 2 lb ai/A. PHI 14 days for forage or silage or 48 days for grain or fodder. REI 24 hr. Do not exceed four applications per season. Retreatments every 14 days.
  • chlorantraniliprole (Coragen) at 0.026 to 0.065 lb ai/A. PHI 14 days. REI 4 hr. Do not exceed 4 treatments nor 0.2 lb ai/A per season. Retreatment interval 7 days.
  • chlorantraniliprole/lambda-cyhalothrin (Besiege) Group 3 & 28 insecticide at 0.52 to 0.08 lb ai/A (6.0 to 10.0 fl oz/A). PHI 21 days. REI 24 hr. Do not exceed 0.12 lb ai of lambda-cyhalothrin or 0.2 lb ai of chlorantraniliprole per acre per growing season. Retreatment interval 7 days.
  • cyfluthrin (Tombstone) insecticide at 0.033 to 0.044 lb ai/A (2.1 to 2.8). PHI 0 days for green forage and 21 days for grain or fodder. REI 12 hr. Retreatment interval 7 days. Do not exceed four applications or 0.175 lb ai/A per season.
  • deltamethrin (Delta Gold) Group 3 insecticide at 0.012 to 0.018 lb ai/A (1.0 to 1.5 fl/A). PHI 21 days for grain or fodder or 12 days for forage or grazing. REI 12 hr. Retreatment interval is 21 days. Do not exceed 0.095 lb ai/A per season. Limit 5 treatments per year.
  • dimethoate (Dimethoate 400 EC) Group 1B insecticide/miticide at 0.5 lb ai/A (1 pint/A). PHI 14 days forage; 28 days grain. REI 48 hr. Do not exceed 0.5 lb ai/A per season.
  • esfenvalerate (Asana XL) Group 3 insecticide at 0.03 to 0.05 lb ai/A (5.8 to 9.6 fl oz/A). For control of first and second instar a rate range of 0.02 to 0.03 lb ai/A (3.9 to 5.8 fl oz/A). PHI 21 days. REI 12 hr. Do not exceed 0.25 lb ai/A per season.
  • gamma-cyhalothrin (Declare) Group 3 insecticide at 0.01 to 0.015 lb ai/A. PHI 1 day for grazing and forage, or 21 days for fodder and silage. REI 24 hr. Do not exceed 0.06 lb ai/A per season.
  • indoxacarb (Steward EC) Group 22 insecticide at 0.059 to 0.11 lb ai/A. PHI 14 days grain, 1 day forage, fodder, silage. REI 12 hr. Limit 2 treatments. Do not exceed 0.22 lb ai/A per year.
  • lambda-cyhalothrin (Warrior II) Group 3 insecticide at 0.02 to 0.03 lb ai/A. PHI 21 days. REI 24 hr. Do not apply more than 0.12 lb ai/A per season, 0.06 lb ai/A after silk initiation, or 0.03 lb ai/A after milk stage.
  • malathion (Drexel 5EC, Fyfanon 57EC, Fyfanon 8 lb Emulsion and several other formulations)-See label for rates. Rates may vary between formulations. PHI 7 days. REI 72 hr for detasseling, 12 hr for other activities. Group 1.
  • zeta-cypermethrin (Mustang) Group 3A insecticide at 0.034 to 0.05 lb ai/A. PHI 7 days for grain, stover and forage. REI 12 hr. Do not exceed 0.2 lb ai/A per season. Retreatment interval 3 days.