1. Insect
  2. Vegetable Seed Crops
  3. Pests of Onion Grown for Seed

Onion seed-Armyworm and cutworm

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Image related to Onion seed-Armyworm and cutworm
Western yellowstriped armyworm
Spodoptera praefica Grote
Young immature showing damage on leaves
© Ken Gray Insect Image Collection
Image related to Onion seed-Armyworm and cutworm
Western yellowstriped armyworm
Spodoptera praefica Grote
Egg(s) on host
© Ken Gray Insect Image Collection
Image related to Onion seed-Armyworm and cutworm
Western yellowstriped armyworm
Spodoptera praefica Grote
Adult
© Ken Gray Insect Image Collection
Image related to Onion seed-Armyworm and cutworm
Variegated cutworm
Peridroma saucia Hubner
Adult
© Ken Gray Insect Image Collection
Image related to Onion seed-Armyworm and cutworm
Bertha armyworm
Mamestra configurata Walker
Adult
© Ken Gray Insect Image Collection
Image related to Onion seed-Armyworm and cutworm
Variegated cutworm
Peridroma saucia Hubner
Newly hatched on host
© Ken Gray Insect Image Collection
Image related to Onion seed-Armyworm and cutworm
Beet armyworm
Spodoptera exigua Hubner
Egg(s) on host
© Ken Gray Insect Image Collection
Image related to Onion seed-Armyworm and cutworm
Beet armyworm
Spodoptera exigua Hubner
Immature female adult
© Ken Gray Insect Image Collection
Image related to Onion seed-Armyworm and cutworm
Black cutworm
Agrotis ipsilon Hugnagel
Adult
© Ken Gray Insect Image Collection
Image related to Onion seed-Armyworm and cutworm
Bertha armyworm
Mamestra configurata Walker
Immature
© Ken Gray Insect Image Collection
Image related to Onion seed-Armyworm and cutworm
Variegated cutworm
Peridroma saucia Hubner
Immature
© Ken Gray Insect Image Collection
Image related to Onion seed-Armyworm and cutworm
Beet armyworm
Spodoptera exigua Hubner
Adult
© Ken Gray Insect Image Collection

Beet armyworm (Spodoptera exigua)
Bertha armyworm (Mamestra configurata)

Western yellowstriped armyworm (Spodoptera praefica)
Black cutworm (Agrotis ipsilon)
Variegated cutworm (Peridroma saucia)

Pest description and crop damage Dark or various-color moth larvae that damage roots and bulbs by feeding.

Management-chemical control

  • azadirachtin (Neemix 4.5) at 4 to 16 fl oz/a (0.012 to 0.049 lb ai/a) for armyworm. For cutworm (Neemix 4.5) at 5 to 16 fl oz/a (0.015 to 0.049 lb ai/a). PHI 0 days. REI 4 hr. In most cases, apply at high rate. Effective on larval or immature stages only. This botanical pesticide acts slowly. Repeat in 7 to 10 days as needed. Spray early and check for effect. Some formulations are OMRI-listed for organic production.