Insect Control

Cabbage Maggot (Delia radicum)

Cabbage maggot can be excluded from brassica crops with spunbonded row covers. Cover at seeding and seal the edges with soil to exclude the adult fly, which lays eggs at the base of young radish seedlings. Do not plant into land that was occupied by a brassica crop the previous year, as this pest overwinters as pupae in soils that housed infested plants.

See the Cabbage, Broccoli, Cauliflower, and other Brassica Crops insect control section for more information about cabbage maggot.

IRAC Group 28:

• cyantraniliprole (Verimark): 10 to 13.5 oz/A; PHI 0d, REI 4h, Bee: H. For soil applications at planting. Suppression only. 

Cutworms

See the Pepper and Tomato (Outdoor) insect control sections for information on black and variegated cutworms.

IRAC Group 1:

• carbaryl (10% Sevin Granules): 20 lb/A; PHI 7d, REI 12h, Bee: H, Group 1A. Apply evenly over soil surface.

IRAC Group 3:

• alpha-cypermethrin (Fastac* CS): 1.3 to 3.8 oz/A; PHI 1d, REI 12h, Bee: H.
• beta-cyfluthrin (Baythroid* XL): 1.6 to 2.8 oz/A; PHI 0d, REI 12h, Bee: H.
• bifenthrin (Brigade* 2EC): 5.12 to 6.4 oz/A; PHI 21d, REI 12h, Bee: H. 
• deltamethrin (Delta Gold*): 1 to 2.4 oz/A; PHI 3d, REI 12h, Bee: H.

IRAC Group 5:

• spinosad (Seduce^OG): 20 to 44 lb/A, 0.5 to1 lb/1000 sq ft.; PHI 3d, REI 4h, Bee: M. Spread bait on soil around plants.

IRAC Group 11:

• Bacillus thuringiensis aizawai (XenTari^OG): 0.5 to 1.5 lb/A; PHI 0d, REI 4h, Bee: L. Must be ingested. For resistance management, may be rotated with Bt kurstaki products (Dipel).
• Bacillus thuringiensis kurstaki (Dipel DF^OG): 0.5 to 2 lb/A; PHI 0d, REI 4h, Bee: L. Must be ingested. For resistance management, may be rotated with Bt aizawai products (XenTari).

IRAC Group 18:

• methoxyfenozide (Intrepid 2F): 8 to 16 oz/A; PHI 1d, REI 4h, Bee: L. Suppression only.

Flea Beetle, Crucifer (Phyllotreta cruciferae) and Striped (P. striolata)

See the Cabbage, Broccoli, Cauliflower, and Other Brassica Crops insect control section for information on flea beetles that attack brassica crops.

IRAC Group 1:

• carbaryl (Sevin XLR Plus): 0.5 to 1 qt/A; PHI 7d, REI 12h, Bee: H, Group 1A. Do not apply to crops or weeds in bloom. 

IRAC Group 3:

• alpha-cypermethrin (Fastac* CS): 1.8 to 3.8 oz/A; PHI 1d, REI 12h, Bee: H.
• beta-cyfluthrin (Baythroid* XL): 1.6 to 2.8 oz/A; PHI 0d, REI 12h, Bee: H.
• bifenthrin (Brigade* 2EC): 5.12 to 6.4 oz/A; PHI 21d, REI 12h, Bee: H. 
• deltamethrin (Delta Gold*): 1.5 to 2.4 oz/A; PHI 3d, REI 12h, Bee: H.
• esfenvalerate (Asana* XL): 5.8 to 9.6 oz/A; PHI 7d, REI 12h, Bee: H.
• pyrethrin (PyGanic EC5.0^OG): 4.5 to 15.61 oz/A, or 0.25 to 0.50 oz/gal and 3 gal/1000 sq ft in greenhouse for backpack sprayers; PHI 0d, REI 12h, Bee: M.

IRAC Group 4:

• imidacloprid (Admire Pro): 4.4 to 10.5 oz/A soil, 1.2 oz/A foliar; PHI 21d soil, 7d foliar, REI 12h, Bee: H, Group 4A. 
• thiamethoxam (Actara): 1.5 to 3 oz/A; PHI 7d, REI 12h, Bee: H, Group 4A.
• thiamethoxam (Platinum 75SG): 1.7 to 2.17 oz/A; REI 12h, Bee: H, Group 4A. Systemic insecticide used at planting. 

IRAC Group 5:

• spinetoram (Radiant SC): 6 to 8 oz/A; PHI 7d, REI 4h, Bee: M. Suppression only.
• spinosad (Entrust SC^OG): 3 to 6 oz/A; PHI 3d, REI 4h, Bee: M.

IRAC Group UN:

• kaolin (Surround WP^OG): 25 to 50 lb/A, 0.25 to 0.5 lb/gal; PHI 0d, REI 4h, Bee: L. Suppression only. Supplemental controls may be needed for complete control. 
• mineral oil (SuffOil-X^OG): 1 to 2 gal/100 gal; PHI 0d, REI 4h, Bee: L. Apply as needed for beetle larvae control.