Kohlrabi-Diamondback moth

Plutella xylostella

Pest description, crop damage and life history

See:

Pest monitoring Natural enemies and insecticides applied to control other pests keep the diamondback moth under satisfactory control in most fields, but keep records of diamondback moths as you monitor for other caterpillars. Adult moths frequently migrate from fields being harvested or disked under.

In Minnesota, action thresholds for diamondback moth in cabbage are: Where diamondback moth is the primary insect pest (usually early-year), before cupping, treat with Bacillus thuringiensis if 50% of plants are infested with five or more larvae each. After cupping, treat if 10% of plants are infested with one or more larvae each.

Management-biological control

Natural enemies, including an ichneumid wasp and the egg parasite Trichogramma pretiosum, often effectively control diamondback moth in California. Therefore, take into account the level of parasitism when making control decisions.

Management-chemical control: HOME USE

  • acetamiprid
  • azadirachtin (neem oil)-Some formulations are OMRI-listed for organic use.
  • Bacillus thuringiensis var. kurstaki (Btk)-Some formulations are OMRI-listed for organic use.
  • carbaryl
  • cyfluthrin
  • cyhalothrin
  • gamma-cyhalothrin
  • lambda-cyhalothrin
  • malathion
  • permethrin
  • plant-derived essential oils (such as rosemary)-Some formulations are OMRI-listed for organic use.
  • pyrethrins-Some formulations are OMRI-listed for organic use.
  • spinosad-Some formulations are OMRI-listed for organic use.
  • zeta-cypermethrin

Management-chemical control: COMMERCIAL USE

  • alpha-cypermethrin (Fastac EC) at 0.014 to 0.025 lb ai/a. PHI 1 day. REI 12 hr. Retreatment interval 7 days. Do not exceed 0.075 lb ai/a per season.
  • beta-cyfluthrin (Baythroid XL) at 0.019 to 0.025 lb ai/a (larvae only). PHI 0 days. REI 12 hr. Retreatment interval 7 days. Do not exceed 0.1 lb ai/a.
  • bifenthrin (Brigade WSB) at 0.033 to 0.1 lb ai/a. PHI 7 days. REI 12 hr. Retreatment interval 7 days. Limit 5 treatments. Do not exceed 0.5 lb ai/a per season.
  • bifenthrin/imidacloprid (Brigadier) at 0.06 to 0.095 lb ai/a. PHI 7 days. REI 12 hr. Do not exceed 0.24 lb ai/a imidacloprid and 0.5 lb ai/a bifenthrin. Retreatment interval 7 days. Maximum 5 applications.
  • Burkholderia spp. (Venerate XC) at 1 to 8 quarts/a product. PHI 0 days. REI 4 hr. OMRI-listed for organic use.
  • carbaryl (Sevin 4F) at 1 to 2 lb ai/a. PHI 3 days. REI 12 hr. Retreatment interval 7 days. Limit 4 treatments per year. Do not exceed 6 lb ai/a per year.
  • chlorantraniliprole (Coragen) at 0.045 to 0.098 lb ai/a a) at planting; b) via drip irrigation; c) as foliar. PHI 3 days. REI 4 hr. Retreatment interval 3 days for foliar and 10 days for chemigation. Do not exceed 0.2 lb ai/a per season.
  • chlorantraniliprole/lambda-cyhalothrin (Voliam Xpress) at 0.059 to 0.088 lb ai/a. PHI 3 days. REI 24 hr. Minimum of 5 days between applications. Do not exceed 0.24 lb ai of lambda-cyhalothrin or 0.2 lb ai of chlorantraniliprole per acre per growing season.
  • chlorantraniliprole/thiamethoxam (Voliam Flexi) at 0.1 to 0.175 lb ai/a. PHI 3 days. REI 12 hr. Retreatment interval 7 days. Do not exceed 0.172 lb ai of thiamethoxam or 0.2 lb ai of chlorantraniliprole per acre per growing season.
  • chlorpyrifos (Lorsban 75WG) at 0.5 to 1 lb ai/a. PHI 21 days. REI 24 hr. Do not exceed 3 applications per season.
  • Chromobacterium subtsugae (Grandevo) at 0.3 to 0.9 lb ai/a per 100 gal. PHI 0 days. REI 4 hr. OMRI-listed for organic use.
  • cyantraniliprole (Exirel) at 0.045 to 0.088 lb ai/a. PHI 1 day. REI 12 hr. Retreatment interval 5 days. Limit 6 treatments per year. Do not exceed 0.4 lb ai/a per year.
  • cryolite (Kryocide) at 7.7 to 15.4 lb ai/a. PHI 7 days. REI 12 hr. Do not exceed 92 lb ai/a per season. Some formulations are OMRI-listed for organic use.
  • cyfluthrin (Tombstone) at 0.038 to 0.05 lb ai/a. PHI 0 days. REI 12 hr. Do not exceed 0.2 lb ai/a per season. Retreatment interval 7 days.
  • emamectin benzoate (Proclaim) at 0.008 to 0.015 lb ai/a. PHI 7 days. REI 12 hr. Retreatment interval 7 days. Do not exceed 0.09 lb ai/a per season. Do not graze.
  • flubendiamide (Synapse WG) at 0.045 to 0.075 lb ai/a. PHI 1 day. REI 12 hr. Do not exceed 0.225 lb ai/a per crop season.
  • flubendiamide + buprofenzin (Vetica) at 0.21 to 0.42 lb ai/a. PHI 1 day. REI 12 hr. Do not exceed 0.83 lb ai/a per season. Retreatment interval 7 days. Limit 2 treatments per crop.
  • gamma-cyhalothrin (Declare) at 0.01 to 0.015 lb ai/a. PHI 1 day. REI 24 hr. Do not exceed 0.12 lb ai/a per season. An oil or nonionic surfactant improves performance.
  • GS-omega/kappa (Spear Biological Insecticide) at 0.8 lb ai/a. PHI 0 days. REI 4 hr. Do not exceed 2 lb ai/a per year.
  • indoxacarb (Avaunt) at 0.065 lb ai/a. PHI 3 days. REI 12 hr. Retreatment interval 3 days. Do not exceed 0.26 lb ai/a per season.
  • lambda-cyhalothrin (Warrior II) at 0.02 to 0.03 lb ai/a. PHI 1 day. REI 24 hr. Retreatment interval 5 days. Do not exceed 0.24 lb ai/a per season.
  • lambda-cyhalothrin + thiamethoxam (Endigo ZC) at 0.064 to 0.072 lb ai/a. PHI 1 day. REI 24 hr. Retreatment interval 7 days. Do not exceed 0.24 lb ai/a of lambda-cyhalothrin or 0.172 lb ai/a of thiamethoxam per season.
  • novaluron (Rimon EC) at 0.039 to 0.078 lb ai/a. PHI 7 days. REI 12 hr. Retreatment interval 7 days. Do not exceed 0.156 lb ai/a per season.
  • spinetoram (Radiant SC) at 0.0391 to 0.0781 lb ai/a. PHI 1 day. REI 4 hr. Retreatment interval 4 days. Do not exceed 0.266 lb ai/a per season. Do not apply to seedling cole crops grown for transplant within a greenhouse, shade house, or field plot. Limit 6 treatments per season.
  • spinosad (Success, Entrust SC) at 0.023 to 0.063 lb ai/a. PHI 1 day. REI 4 hr. Do not exceed three applications in a 30-day period. Do not exceed six applications or 0.45 lb ai/a per crop. Entrust SC is OMRI-listed for organic use.
  • thiamethoxam + chlorantraniliprole (Durivo) at 0.195 to 0.257 lb ai/a soil. PHI 30 days. REI 12 hr. Do not exceed 0.172 lb ai/a thiamethoxam or 0.2 lb ai/a chlorantraniliprole per season.
  • zeta-cypermethrin (Mustang) at 0.028 to 0.05 lb ai/a. PHI 1 day. REI 12 hr. Retreatment interval 7 days. Do not exceed 0.3 lb ai/a per season.