Cutworms

Cutworms

Several species of cutworm larvae (caterpillars) may reduce stands by cutting the stems of seedling plants below the cotyledons. Larvae are active at night and hide in the soil during the day. Cutworm damage occurs most frequently following legume cover crops or in reduced tillage systems. They often become established on existing vegetation and feed on emerging cotton once this vegetation has been killed. Destroying all green vegetation at least 21 days prior to planting reduces the likelihood of cutworm attack.

Scout for cutworms by counting the number of cut and undamaged plants in 50 feet of row at multiple locations in a field. A pocket knife or garden trowel can be used to dig up larvae from the soil around damaged or adjacent plants to confirm their presence.

Treat when cutworms threaten to reduce stands to less than three plants per row foot. Alternatively, consider treating if 5% or more of plants have been freshly cut.  Infestations may be spotty within a field and only require treatment where damage and live cutworms are found.

 

Management Options

 

Insecticide (Trade Names) for CUTWORMSLb Active Ingredient per AcreAmount Formulation per AcreAcres Treated per Gal or Lb of Dry ProductPerformance Rating
acephate 90 (Orthene 90S)0.720.8 lb1.256
bifenthrin (Brigade 2, Discipline 2, Fanfare 2)0.05 - 0.13.2 - 6.4 oz40 - 206
chlorpyrifos (Lorsban 4, Nufos 4)0.75 - 124 - 32 oz5.3 - 47
chlorpyrifos (Lorsban Advanced 3.755)0.75 - 125.6 - 34.1 oz5 - 3.87
cypermethrin 2.50.025 - 0.11.3 - 5 oz100 - 258
deltamethrin (Delta Gold 1.5)0.013 - 0.0191.11 - 1.62 oz115 - 798
esfenvalerate (Asana XL 0.66E)0.03 - 0.055.8 - 9.6 oz22 - 138
β-cyfluthrin (Baythroid XL 1)0.0065 - 0.01250.8 - 1.6 oz160 - 808
γ-cyhalothrin (Declare 1.25)0.0075 - 0.010.77 - 1.02 oz166 - 1258
λ-cyhalothrin (Karate 2.08, Warrior II)0.015 - 0.020.96 - 1.28 oz133 - 1008
Ζ-cypermethrin (Mustang Max 0.8)0.008 - 0.0121.28 - 1.92 oz100 - 678

 

  • Do not expect Bt cotton to provide adequate control of cutworms, although it provides some protection against small larvae or low infestation levels.
  • A near-planting foliar insecticide application may be justified if non-crop vegetation was not burned down at least 21 days prior to planting. This application can be applied in a band over the row.