Hodges#8887

Pronunciation

How to pronounce Trichoplusia ni: /ˌtrɪkoʊˈplusiə ˈnaɪ/

These audio files are automatically generated. While they are not always 100% accurate, they are a good starting point.

Images

Summary

The cabbage looper (Trichoplusia ni) is a migratory moth known for its pest status on cruciferous crops, with a life cycle including egg, larval, pupal, and adult stages. It displays notable behavior such as looping during larval movement and is affected by multiple environmental and biological factors.

Physical Characteristics

Medium-sized moth; forewing length 15-18 mm; forewings a blend of light and dark brown with a small U-shaped stigma, hindwings gleaming grayish-brown; larvae green with thin white stripes down the back and one thicker white stripe along the side.

Identification Tips

Distinguished by looping movement when crawling; adults exhibit gray-brown forewings and light brown hindwings; females have flat-lying light brown hairs on the abdomen.

Habitat

Fields, gardens, typically where cruciferous vegetables are grown.

Distribution

Found across North America and Eurasia; from Florida to British Columbia, south to Argentina; migrates seasonally.

Diet

Larvae primarily feed on crucifers (cabbage, broccoli, etc.) but can utilize over 160 host plants including various vegetables.

Life Cycle

Egg, larva (caterpillar), pupa, adult; life cycle generally spans 24–33 days; 1-3 generations per year depending on environmental conditions.

Reproduction

Females lay eggs singly on host plants, preferring leaves that are larger and higher on the plant; can lay up to 1000-2000 eggs in a day.

Predators

Generalists including spiders, ants, lady beetles; tachinid flies are primary parasitoids.

Ecosystem Role

Pollinator and pest; contributes to nutrient cycling through decomposition of organic matter (in larval stage), and prey for various predators.

Economic Impact

Considered a pest of crucifers, leading to significant crop damage; resistance to insecticides complicates management.

Collecting Methods

• Light traps
• Hand collection from host plants

Preservation Methods

• Pinning
• Freezing specimens

Evolution

Part of the large Noctuidae family, related to other pest species; genome contains numerous genes related to pesticide resistance.

Similar Taxa

• Cabbage worm
• Diamondback moth
• Cutworms

Misconceptions

Not all cabbage worms are closely related; although they share similar appearances, they belong to different families.

Tags

• moth
• agricultural pest
• Lepidoptera
• pest management