Beet Armyworm Moth

spodoptera exigua

The Beet Armyworm Moth (Spodoptera exigua) is a small, drab-colored moth with a significant global impact as an agricultural pest. While the adult moths are relatively inconspicuous, their larval stage, known as the beet armyworm, is notorious for its voracious appetite and wide host range, feeding on hundreds of different plant species. This species is highly adaptable and opportunistic, thriving in a variety of environments from agricultural fields to home gardens. Its ability to rapidly reproduce, migrate long distances, and develop resistance to pesticides makes it a formidable challenge for farmers worldwide, leading to substantial economic losses in crops like cotton, tomatoes, and various vegetables. Despite its pest status, it plays a role in the ecosystem as a food source for natural predators and parasitoids.

Habitat: Found predominantly in agricultural fields, cultivated lands, and gardens, as well as disturbed areas and weedy patches where host plants are abundant.

Appearance

Adult Beet Armyworm Moths are relatively small, with a wingspan typically ranging from 2 to 3 cm. Their forewings are mottled gray-brown, often featuring an obscure kidney-shaped spot near the center and a pale, irregular band towards the outer margin. The hindwings are a translucent pearly white, sometimes with a faint brown border. The larvae, or armyworms, vary considerably in color depending on their diet and age, ranging from pale green to dark gray or nearly black, often with a prominent dark stripe running along each side of their body and a lighter stripe above it. They reach up to 3 cm in length when fully grown.

KingdomAnimaliaPhylumArthropodaClassInsectaOrderLepidopteraFamilyNoctuidaeGenusSpodoptera

Beet Armyworm Moth

Interesting facts

It has developed resistance to a wide array of insecticides, making its management particularly challenging for farmers.

The Beet Armyworm is considered one of the top 10 most damaging agricultural insect pests worldwide due to its broad host range and rapid reproduction.

The species name 'exigua' means 'small' or 'meager' in Latin, referring to its relatively small size compared to some other moth species.

Unlike many caterpillars, beet armyworm larvae often feed in groups when young, skeletonizing leaves, but become solitary as they mature.

Special abilities

The larval stage has an extremely broad diet, feeding on over 100 different plant species from many botanical families, allowing it to thrive in diverse agricultural settings.

Adult moths are strong fliers and can migrate hundreds or even thousands of kilometers, enabling them to colonize new areas and escape unfavorable conditions.

This species has a short generation time, allowing for multiple generations per year, which contributes to its ability to quickly build large populations and cause significant crop damage.

Measurements & details

Length: 1 cm
Wingspan: 2-3 cm
Weight: 0.00005-0.0001 kg
Lifespan: 0 years
Clutch Size: 300-1000
Incubation: 2-5 days
Migration Distance: 1500 km

Diet & Feeding

The larval stage of the beet armyworm moth is polyphagous, feeding on the leaves, fruits, and growing points of a wide variety of plants. Adult moths primarily feed on nectar from various flowering plants.

Age differences: Larvae are defoliators and fruit feeders, while adults sustain themselves on nectar for energy and reproduction.

Primary Foods

Cotton
Tomatoes
Alfalfa
Sugar beets
Peppers
Nectar

Foraging Method

Foraging

Ecological connections

host plant

Cotton

Gossypium hirsutum

Larval host plant

host plant

Tomato

Solanum lycopersicum

Larval host plant

parasite

Cotesia marginiventris

Parasitizes larvae, regulating populations

eaten by

Convergent Lady Beetle

Hippodamia convergens

Predates on larvae and eggs

Traits

No trait badges are assigned for this object yet.

Also known as

No aliases listed yet.

Collections

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Safety

Danger

1/5 · Very low

No special safety notes yet.

Frequently Asked Questions

How to identify Beet Armyworm Moth?

The easiest way to identify Beet Armyworm Moth is to use the Snappit nature identifier app.

How long is Beet Armyworm Moth?

1 cm

What is Beet Armyworm Moth's wingspan?

2-3 cm

How much does Beet Armyworm Moth weigh?

0.00005-0.0001 kg

How long does Beet Armyworm Moth live?

0 years

What does Beet Armyworm Moth eat?

Where is Beet Armyworm Moth usually found?

Found predominantly in agricultural fields, cultivated lands, and gardens, as well as disturbed areas and weedy patches where host plants are abundant.

How does Beet Armyworm Moth hunt?

Foraging