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

Field and silage corn-Aphid

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Image related to Field and silage corn-Aphid
Corn leaf aphid
Rhopalosiphum maidis Fitch
© Ken Gray Insect Image Collection
Image related to Field and silage corn-Aphid
"oat bird-cherry" aphid
Rhopalosiphum padi Linnaeus
Female adult
© Ken Gray Insect Image Collection
Image related to Field and silage corn-Aphid
"oat bird-cherry" aphid
Rhopalosiphum padi Linnaeus
© Ken Gray Insect Image Collection

Includes

Bird-cherry oat aphid (Rhopalosiphum padi)
Corn leaf aphid (Rhopalosiphum maidis)

Pest description and crop damage Orange green to olive green and black aphids suck sap. They may become very abundant, especially later in the season. Heavy populations may be evident if golden yellow streaking is found on the leaves. Large populations of aphids may reduce kernel number and size.

Management-chemical control

  • abamectin/azoxystrobin/fludioxonil/mefenoxam/thiabendazole/thiamethoxam (Avicta Complete 250 Nematicide/Insecticide/Fungicide) Group 4A 6 insecticide, Group 1,4,11,12 fungicide-Only to be treated directly to seed, in Syngenta-certified facilities, Farmer application not permitted.
  • abamectin/thiamethoxam (Avicta Duo 250 Corn) Group 4A 6 nematicide/insecticide-Apply as slurry to corn seed. Only to be treated in Syngenta-certified facilities, Farmer application not permitted.
  • alpha-cypermethrin (Fastac CS, Fastac EC) Group 3A insecticide at 0.018 to 0.025 lb ai/A (2.7 to 3.8 fl oz). 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 (Aza-Direct, Azaguard and several formulations) Biological insecticide/nematicide at 0.02 to 0.35 lb ai/A. PHI 0 days. REI 4 hr. Some formulations are OMRI-listed for organic use.
  • Beauveria bassiana GHA (Bioceres WP, Mycotrol ESO, BotaniGard, several variations of each) mycoinsecticide at 4 oz/A. REI 4 hr. PHI 0 day. OMRI-listed for organic use.
  • bifenthrin (Brigade 2EC) Group 3A insecticide at 0.033 to 0.1 lb ai/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.
  • bifenthrin/zeta-cypermethrin (Hero EW insecticide, Hero insecticide, Steed insecticide) at 0.04 to 0.1 lb ai/A. PHI 30 days grain and stover; 60 days forage. REI 12 hr. Do not graze for 30 days after treatment. 0.099 lb/A zeta-cypermethrin and 0.398 lb/A bifenthrin per year.. Group 3A insecticide.
  • Burkholderia spp. strain A396 (Venerate XC) 1 to 4 quarts/A. For suppression only. REI 4 hr. PHI 0 days. Bioinsecticide. OMRI listed.
  • chlorantraniliprole/lambda-cyhalothrin (Besiege) Group 3 & 28 insecticide at 5 to 10 fl oz ai/A (suppression only). 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.
  • Chromobacterium subtsugae (Grandevo) bioinsecticide at 0.6 to 0.9 lb ai/A per 100 gal. PHI 0 days (2 to 3 lb/A). REI 4 hr. OMRI-listed for organic use.
  • clothianidin (Lumisure, Nipsit Inside, Poncho 600 Seed Treatment) at 0.044 to 0.88 lb ai per 100 lb of seed. Seed treated with Lumisure must be colored with EPA approved dye. All seed require minimum depth of 0.5 inch. Do not plant non-listed crops in same area less than 4 months after planting treated seed. Group 4A
  • deltamethrin (Delta gold 1.5EC) at 0.018 to 0.022 lb ai/A. Suppression only. Do not apply more than 0.095 lb ai/A per growing season. REI 12 hr, PHI 21 days. Group 3
  • dimethoate (Dimethoate 400 EC, Drexel Dimethoate 4EC) Group 1B insecticide/miticide at 0.33 to 0.5 lb ai/A (0.6 to 1.0 pint/A). PHI 14 days forage; 28 days grain. REI 48 hr. Do not exceed 0.5 lb ai/A per season. Do not apply during pollen shed if bees are foraging actively.
  • esfenvalerate (Asana XL, S-Fenvalostar, Zyrate) at 0.03 to 0.05 lb ai/A (5.8 to 9.6 fl oz/A). For optimum results, direct the spray at the aphid population so as to achieve maximum coverage of the exposed insects. Aphids not contacted by the spray, such as in whorls and leaf axils, may not be adequately controlled. PHI 21 days. REI 12 hr. Do not exceed 0.25 lb ai/A per season. Group 3 insecticide.
  • flupyradifurone (Sivanto 200SL) Group 4D insecticide at 0.09 to 0.14 lb ai/A (7.0 to 14.0 fl oz/A). PHI 7 days forage; 21 days grain, stover or straw. REI 4 hr. Retreatment interval 7 days. Do not exceed 0.365 lb ai/A per calendar year.
  • gamma-cyhalothrin (Declare) at 0.01 to 0.15 lb ai/A. For suppression only. PHI 21 days. REI 24 hr. Do not apply more than 0.24 lb ai/A from planting to foliar applications per year.
  • malathion (Drexel 5EC, Fyfanon 57EC, Fyfanon 8 lb Emulsion and several other formulations) Group 1 insecticide at 0.6 to 1 lb ai/A (1 pint/A). Limit 2 treatments per year. Retreatment interval 7 days. PHI 7 days. REI 72 hr for detasseling, 12 hr for other activities.
  • methomyl (Lannate SP) Group 1A insecticide at 0.23 to 0.45 lb ai/A. PHI 21 days for ears, 3 days for forage, or 21 days for fodder. REI 2 days. Initial application when corn is at 1-2 leaf stage for early control with second application 5 to 7 days later if needed. Do not exceed 2.25 lb ai/A or 5 treatments per season. Retreatment interval 5 to 7 days.
  • sulfoxaflor (Transform WG) Group 4C insecticide at 0.023 to 0.047 lb ai/A. PHI 14 days for grain or straw. Do not apply more than 0.09 lb ai of sulfoxaflor per acre per year.
  • tebuconazole/lambda-cyhalothrin (Crossover) Group 3 fungicide/insecticide at 0.14 to 0.16 lb ai/A (8 to 9.5 oz/A). PHI 21 days fodder and silage. REI 24 hr. Retreatment interval 7 days. Do not exceed 0.48 lb ai/A tebuconazole or 0.12 lb ai/A lambda-cyhalothrin per season.
  • 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.