Collard and kale-Leafminer

Includes

Cabbage leafminer (Liriomyza brassicae)
Pea leafminer (Liriomyza huidobrensis)

Pest description and crop damage Adults are small black to gray flies with yellow markings. The body is covered with long, stiff bristles. Larvae are nearly translucent white or yellow and about 0.25 inch long when mature. Eggs are white, cylindrical, and laid singly or in small groups.

Both larvae and adults cause damage to plants. Larval feeding results in slender, winding trails on the leaves, which form large, white blotches when mining becomes severe. Adults can make as many as 100 feeding punctures on a single leaf. Around 5% of these punctures may contain actively feeding larvae. Excessive mining renders leaves unmarketable, reduces photosynthetic capacity, and provides easy access for disease organisms.

Management-chemical control: HOME USE

  • acetamiprid
  • azadirachtin (neem oil)-Some formulations are OMRI-listed for organic use.
  • carbaryl
  • cyfluthrin
  • kaolin-When applied as a spray to foliage it acts as a repellent to some insect pests. Some formulations are OMRI-listed for organic use.
  • malathion
  • permethrin
  • 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 0.02 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. Adults only.
  • cyantraniliprole (Exirel) at 0.088 to 0.133 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. Add appropriate adjuvant.
  • cyromazine (Trigard) at 0.125 lb ai/a. PHI 7 days. REI 12 hr. Do not exceed six applications or 0.75 lb ai/a per crop. Retreatment interval 7 days.
  • dimethoate (Dimethoate 4E) at 0.25 lb ai/a. PHI 14 days. REI 48 hr. Kale only. Do not exceed 0.5 lb/a per season. Retreatment interval 15 days.
  • emamectin benzoate (Proclaim) at 0.01 to 0.015 lb ai/a. PHI 14 days. REI 12 hr. Do not exceed 0.09 lb ai/a per season. Retreatment interval 7 days. Do not graze.
  • spinetoram (Radiant SC) at 0.047 to 0.078 lb ai/a. PHI 1 day. REI 4 hr. Retreatment interval 4 days. Do not exceed six applications or 0.266 lb ai/a per season. Follow resistance management procedures on the label. Do not apply to seedling cole crops grown for transplant within a greenhouse, shade house, or field plot.
  • spinosad (Success) at 0.0625 to 0.156 lb ai/a. PHI 1 day. REI 4 hr. Do not exceed six applications or 0.45 lb ai/a per crop. Use a spray adjuvant for leafminers and thrips. Some formulations are OMRI-listed for organic use.
  • zeta-cypermethrin (Mustang) at 0.04 to 0.05 lb ai/a. REI 12 hr. Retreatment interval 7 days. Do not exceed 0.3 lb ai/a per season. Adult leafminers only.