Includes beet webworm (Loxostege sticticalis)
Pest description and crop damage Caterpillars vary from light to dark with three white longitudinal stripes and many black and white tubercles.
Management-chemical control
- azadirachtin (Atrevia 3% SL) at 0.015 to 0.03 lb ai/A. REI 4 hr. PHI 0 days. OMRI-listed for organic use.
- carbaryl (Drexel Carbaryl 4L, Carbaryl 4L, Sevin XLR ) at 1 to 1.5 lb ai/A. PHI 7 days before harvest or grazing. Use only once per cutting. REI 12 hr. Do not use carbaryl when clover is blooming or when bees are foraging actively. Carbaryl may burn foliage under wet or hot conditions.
- methoxyfenozide (Intrepid 2F, Engame, Troubadour 2F, Vexer DRV, WithStand, Insurgent) at 0.06 to 0.16 lb ai/A. PHI 7 days for hay; 0 days for forage; livestock can enter and graze on treated area immediately after application. REI 4 hr. Do not exceed 0.5 lb.
- zeta-cypermethrin (Mustang, Mustang Maxx, Cortes MAXX)-Mustang at 0.028 to 0.05 lb ai/A; Mustang Maxx or Cortes MAXX at 0.014 to 0.025 lb ai/A. PHI 3 days cutting and grazing; 7 days for seed. REI 12 hr. Do not apply more than 0.05 lb ai per cutting or 0.15 lb ai per season of Mustang or 0.025 lb ai per cutting and 0.075 lb ai per season of Mustang Maxx. Retreatment interval 7 days.
Management-biological control
- parasitic wasps such as as Trichogramma spp. may provide long-term suppression of webworm populations.