Corn seed-Western bean cutworm

Striacosta albicosta

Pest description and crop damage Large brown caterpillars that feed on foliage and burrow into ears. Female moths lay egg masses on corn foliage. The caterpillars will move from plant to plant, and individuals from a single egg mass may infest nearby plants within a six- to 10 foot circle.

Management-chemical control

Treat when egg masses or larvae are present.

  • alpha-cypermethrin (Fastac EC) at 0.011 to 0.025 lb ai/a. REI 12 hr. PHI 30 days. If crop residue is to be fed to livestock, PHI is 30 days for grain or stover. Retreatment interval 3 days. Do not exceed 0.075 lb ai/a per season. This product is highly toxic to bees and other pollinators exposed to direct treatment or residues on blooming crops or weeds. Do not apply this product or allow it to drift to blooming crops or weeds if bees or other pollinating insects are foraging in the treatment area. Not for use on sweet corn seed. (Group 3A)
  • beta-cyfluthrin (Baythroid XL) at 0.013 to 0.022 lb ai/a. If crop residues are to be used for fodder (stover), there is a 21 day PHI. REI 12 hr. Do not exceed four applications or 0.088 lb ai/a per season. This product is highly toxic to bees and other pollinators exposed to direct treatment or residues on blooming crops or weeds. Do not apply this product or allow it to drift to blooming crops or weeds if bees or other pollinating insects are foraging in the treatment area. (Group 3A)
  • bifenthrin (Bifenthrin 2EC; other products) at 0.0046 lb ai/1,000 row ft at plant or 0.047 to 0.062 lb ai/a preplant. PHI 30 days. REI 12 hr. Do not apply more than 0.3 lb ai/a per season. Do not apply if heavy rain is imminent. This product is highly toxic to bees and other pollinators exposed to direct treatment or residues on blooming crops or weeds. Do not apply this product or allow it to drift to blooming crops or weeds if bees or other pollinating insects are foraging in the treatment area. Extremely toxic to fish and aquatic invertebrates. (Group 3A)
  • bifenthrin (Bifenthrin 2EC; other products) at 0.033 to 0.1 lb ai/a. PHI is 30 days. REI 12 hr. Do not exceed 0.3 lb ai/a per season. Bifenthrin is highly toxic to bees exposed to direct treatment or residues on blooming crops or weeds. Do not apply this product or allow it to drift to blooming crops if bees are visiting the treatment area. Extremely toxic to fish and aquatic invertebrates. (Group 3A)
  • bifenthrin/zeta+cypermethrin (Hero) at 0.025 to 0.06 lb ai/a foliar or 0.04 to 0.1 lb ai/a at plant. PHI 3 days for sweet corn seed. Do not graze livestock in treated areas or cut treated sweet corn seed crops for feed within 3 days of the last application. For non-sweet corn seed crops, there is a PHI of 30 days for crop residues harvested for stover; do not allow livestock to graze on crop residues for 30 days after treatment. REI 12 hr. Do not exceed 0.4 lb ai/a per season. Refer to product labels for application limits if multiple products containing zeta-cypermethrin are to be used in the same season. Highly toxic to bees and other pollinators exposed to direct treatment or residues on blooming crops or weeds. Do not apply this product or allow it to drift to blooming crops or weeds if bees or other pollinating insects are foraging in the treatment area. (Group 3A)
  • Chromobacterium subtsugae (Grandevo) at 0.6 to 0.9 lb ai/a per 100 gal. PHI 0 days. REI 4 hr. (Unidentified group)
  • chlorpyrifos (numerous products) at 0.5 to 1 lb/ ai/a. PHI 21 days grain or ears. Apply at cultivation at base of plant on both sides of row just ahead of cultivator shovels and cover brace roots with soil. Do not exceed 3 lb ai/a per season. REI 24 hr. Chlorpyrifos is highly toxic to bees and other pollinators exposed to direct treatment or residues on blooming crops or weeds. Do not apply this product or allow it to drift to blooming crops or weeds if bees or other pollinating insects are foraging in the treatment area. (Group 1B)
  • chlorpyrifos/gamma cyhalothrin (Cobalt) at 0.26 to 0.52 lb ai/a. Do not apply within 21 days before harvest of grain, ears, forage or fodder. REI 24 hr. Do not exceed 3 applications nor 2.5 lb/a per season. Refer to product labels for application limits if products containing gamma-cyhalothrin and products containing lambda-cyhalothrin are to be used in the same season. Chlorpyrifos is highly toxic to bees and other pollinators exposed to direct treatment or residues on blooming crops or weeds. Do not apply this product or allow it to drift to blooming crops or weeds if bees or other pollinating insects are foraging in the treatment area. (Groups 1B and 3A)
  • cyfluthrin (Tombstone) at 0.025 to 0.044 lb ai/a. PHI 21 days for grain or fodder. Do not exceed four applications or 0.175 lb ai/a per season. REI 12 hr. Highly toxic to bees and other pollinators exposed to direct treatment or residues on blooming crops or weeds. Do not apply this product or allow it to drift to blooming crops or weeds if bees or other pollinating insects are foraging in the treatment area. (Group 3A)
  • esfenvalerate (Asana XL; other products) at 0.015 to 0.03 lb ai/a. PHI 21 days. REI 12 hr. Do not exceed 0.25 lb ai/a per season. Esfenvalerate is highly toxic to bees and other pollinators exposed to direct treatment or residues on blooming crops or weeds. Do not apply esfenvalerate or allow it to drift to blooming crops or weeds if bees or other pollinating insects are foraging in the treatment area. Esfenvalerate is highly toxic to fish and aquatic invertebrates. (Group 3A)
  • flubendiamide (Belt SC) at 0.0625 to 0.094 lb ai/a. PHI 28 days. If crop residue is to be fed to livestock, PHI 28 days grain or stover. REI 12 hr. Do not exceed 0.375 lb ai/a per season. (Group 28)
  • lambda-cyhalothrin (Warrior II; other products) at 0.015 to 0.025 lb ai/a. PHI 21 days. If crop residues are to be used for livestock, PHI is 1 day for grazing, 21 days for fodder or silage. REI 24 hr. Apply no more than 0.12 lb ai/a per season. Refer to product labels for application limits if products containing gamma-cyhalothrin and products containing lambda-cyhalothrin are to be used in the same season. Highly toxic to bees and other pollinators exposed to direct treatment or residues on blooming crops or weeds. Do not apply lambda-cyhalothrin or allow it to drift to blooming crops or weeds if bees or other pollinating insects are foraging in the treatment area. Lambda-cyhalothrin is extremely toxic to fish and aquatic organisms and toxic to wildlife. (Group 3A)
  • methoxyfenozide (Intrepid 2F) at 0.06 to 0.25 lb ai/a. PHI 21 days. Do not exceed 1 lb ai/a per season. REI 4 hr. (Group 18)
  • permethrin (numerous products) at 0.05 to 0.1 lb ai/a. Not for use on sweet corn seed. If crop residues are to be used for livestock, do not apply less than 30 days prior to harvest of grain or fodder (stover). Not for use on sweet corn seed. REI 12 hr. Do not exceed 0.45 lb ai/a per season. Permethrin is highly toxic to bees exposed to direct treatment or residues on blooming crops or weeds. Do not apply this product or allow it to drift to blooming crops if bees are visiting the treatment area. Extremely toxic to aquatic organisms, (Group 3A)
  • spinetoram (Radiant SC) at 0.023 to 0.047 lb ai/a. PHI 1 day grain harvest. If crop residue is to be fed to livestock, PHI is 3 days for forage or fodder. REI 4 hr. Do not exceed 0.281 lb ai/a per season. Limit 6 applications per season, and do not make more than two consecutive applications of Group 5 insecticides. (Group 5)
  • spinosad (Blackhawk, Success, Entrust, Success) at 0.047 to 0.094 lb ai/a. PHI 1 day. If crop residue is to be fed to livestock, PHI 3 days for forage or fodder (Blackhawk); 28 days for fodder (Entrust and Success). REI 4 hr. Do not apply more than 0.45 lb ai/a per year . Some formulations, such as Entrust, are OMRI-listed for organic use. (Group 5)
  • zeta-cypermethrin (Mustang, Mustang Maxx) at 0.022 to 0.05 lb ai/a (Mustang) or 0.011 to 0.025 lb ai/a (Mustang Maxx_. Do not apply within 7 days of harvest of crop residues for stover. REI 12 hr. Do not exceed 0.2 lb ai/a per season (Mustang) or 0.1 lb ai/a per season (Mustang Maxx). Refer to product labels for application limits if multiple products containing zeta-cypermethrin are to be used in the same season. For control before larvae bore into the plant stalk or ear. Mustang and Mustang Maxx are not for use on sweet corn seed. Zeta-cypermethrin is highly toxic to bees and other pollinators exposed to direct treatment or residues on blooming crops or weeds. Do not apply zeta-cypermethrin or allow it to drift to blooming crops or weeds if bees or other pollinating insects are foraging in the treatment area. (Group 3A)

For additional information

http://extension.colostate.edu/topic-areas/insects/western-bean-cutworm-....