HPIPM:Darksided Cutworm
From BugwoodWiki
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Author: Frank B. Peairs[1]
  Photo by Frank Peairs, Colorado State University, Bugwood.org |
Contents |
Field Biology and Identification
The darksided cutworm, Euxoa messoria (Harris), has a grayish-brown abdomen with a narrow dark gray stripe on either side just above the spiracles. The mature larvae are about 1.2 - 1.4 inches (30 to 35 millimeters) in length and five millimeters wide. It is an early season pest that has but one generation per year. The grayish-brown colored adult moths are found in late summer and autumn. The female moths deposit eggs in the soil in late July and early August. These eggs remain dormant until the air temperatures warm during the following spring. The larvae feed and grow until about the end of June and then pupate in earthen cells near the soil surface.
Plant Response and Damage
Young darksided cutworms may climb up plants to feed on foliage, leaving the plant leaves with a chewed appearance. Younger larvae may chew small, transparent "windows" in young leaves. Older cutworms may cut plants off from one inch below the soil surface to two inches above the soil surface. Most cutworm feeding occurs at night and remain just under the soil surface during the day. Wilted, broken, or dead plants may indicate the presence of cutworms.
Management Approaches
Chemical Control
Check fields early and control if there is more than one cutworm per square foot or if stands are reaching the lower limit for optimum plant populations. Treatment may not be necessary if most larvae are fully grown (1.2 to 1.4 inches) and therefore close to the end of their feeding period.
Product list for Darksided Cutworm:
| Pesticide | Product/Acre (Fl oz. or oz. product) | Preharvest Interval, remarks |
|---|---|---|
| Baythroid XLR,1 | 0.8 - 1.6 | 30 days. 12 hour REI. See labels. Extremely Hazardous to Bees! |
| carbaryl1,2 | See labels | 60 days seed, 30 days grazing or harvest for forage. 12 hour REI. Extremely Hazardous to Bees! |
| chlorpyrifos 4ER,1,2 | See labels | 42 days. 24 hour REI. Do not graze. Extremely Hazardous to Bees! |
| CobaltR,1 | 13 - 26 | 45 days. Do not graze. 24 hour REI. Extremely Hazardous to Bees! |
| cyfluthrinR,1,2 | See labels | 30 days. 12 hour REI. See labels. Extremely Hazardous to Bees! |
| Delta Gold R,1 | 1.0 - 1.5 | 21 days. Do not graze or feed treated foliage. 12 hour REI. Do not apply more than 0.045 lb ai/acre/crop. Extremely Hazardous to Bees! |
| esfenvalerateR,1,2 | See labels | 28 days. Do not apply more than 0.2 lb ai/acre/crop. 12 hour REI. Extremely Hazardous to Bees! |
| gamma cyhalothrinR,1,2 | See labels | 45 days. 24 hour REI. Extremely Hazardous to Bees! |
| lambda cyhalothrinR,1,2 | See labels | 45 days. 24 hour REI. Extremely Hazardous to Bees! |
| Mustang MAXR,1 | 3.2 - 4.0 | 30 days. Do not apply more than 0.125 lb ai/acre/crop. Extremely Hazardous to Bees! |
| RRestricted use pesticide. 1Labeled for chemigation. 2Generic active ingredient, several formulations. | ||
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.
