Field Corn
Dingy Cutworm
Frank B. Peairs
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Cutworm Adult |
Cutworm Larva |
Identification (and life cycle/seasonal history)
Larvae have a dull, dingy brown body with mottled pigmentation. A broad gray stripe runs along the back with light gray V-shaped patterns on each segment. Fully developed larvae are one to 1? inch (25 to 32 millimeter) in length. The forewings of the adult moth are dark brown with bean-shaped markings.
Plant Response and Damage
Larvae feed primarily above ground on leaves and only rarely on stems. They may cut off plants at or just below the soil surface.
Management Approaches
Chemical Control
Early detection of their presence is essential. Cutworms are most prevalent in corn following sod, alfalfa, small grains stubble, or in continuous corn with heavy crop or weed residues. Consider treatment if one plant in 20 is injured and cutworms are present. Crusting or dry surface soil can reduce control with some materials, which can be counteracted by rotary hoeing immediately before or after the application. Pyrethroids have performed better without incorporation in most studies. The effectiveness of current Bt corn hybrids is unknown.
Product list for Dingy Cutworm: |
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Pesticide |
Product/Acre (Fl oz. or oz. product) |
Preharvest Interval, remarks |
Asana XLR,1 |
5.8 - 9.6 |
21 days. Apply as necessary to maintain control. Extremely Hazardous to Bees! |
Aztec 2.1GR |
6.7 oz/1000 row feet |
Band, T band, or in furrow at planting. |
bifenthrinR,1,2 |
2.1 - 6.4 |
30 days. See label. Extremely Hazardous to Bees! |
carbaryl1,2 |
See labels |
48 days grain or stover, 14 days silage. Extremely Hazardous to Bees! |
chlorpyrifos 15G2 |
13.5 lb (broadcast) 8oz/1000 ft |
Suppression only for in furrow treatments. Not for use on popcorn. |
chlorpyrifos 4ER1,2
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16 - 32 |
35 days. 14 days grazing. Not for use on popcorn. Extremely Hazardous to Bees! |
CobaltR1 |
13 – 26 |
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Defcon 2.1GR |
6.7 oz/1000 row feet |
Band, T band, or in furrow at planting. |
Delta Gold R,1 |
1.0 - 1.5 |
21 days to harvest grain or fodder. 12 days to forage. Do not apply more than 0.095 lb ai/acre/crop. Extremely Hazardous to Bees! |
HeroR,1 |
2.6 - 6.1 |
30 days to harvest grain or fodder. 60 days to forage. Do not apply more than 0.4 lb ai/acre/crop. Extremely Hazardous to Bees! |
lambda cyhalothrinR,1,2 |
2.56 - 3.84 |
21 days. Apply as required by scouting or locally prescribed corn growth stages. Do not apply more than 0.12 lb (AI)/acre/season. Extremely Hazardous to Bees! |
Mustang MAXR,1 |
3.2 - 4.0 |
30 days grain or stover, 60 days forage. Extremely Hazardous to Bees! |
permethrinR,1,2 |
See labels. |
30 days. Liquids are Extremely Hazardous to Bees! |
ProaxisR,1 |
2.56 - 3.84 |
21 days. Apply as required by scouting or locally prescribed corn growth stages. Do not apply more than 0.06 lb (AI)/acre/season. Extremely Hazardous to Bees! |
RRestricted use pesticide. 11Labeled for chemigation. 2Generic active ingredient, may be additional formulations. |
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The information herein is supplied with the understanding that no discrimination is intended and that listing of commercial products, necessary to this guide, implies no endorsement by the authors or the Extension Services of Nebraska, Colorado, Wyoming or Montana. Criticism of products or equipment not listed is neither implied nor intended. Due to constantly changing labels, laws and regulations, the Extension Services can assume no liability for the suggested use of chemicals contained herein. Pesticides must be applied legally complying with all label directions and precautions on the pesticide container and any supplemental labeling and rules of state and federal pesticide regulatory agencies. State rules and regulations and special pesticide use allowances may vary from state to state: contact your State Department of Agriculture for the rules, regulations and allowances applicable in your state and locality. |
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Categories: Field Corn, Insects, Dingy Cutworm
Date: 5/16/2008