Crambus

Classification

Phylum: Arthropoda
Subphylum: Hexapoda
Class: Insecta
Order: Lepidoptera
Superfamily: Pyraloidea
Family: Crambidae
Subfamily: Crambinae
Tribe: Crambini
Genus: Crambus

Pronunciation

How to pronounce Crambus: //ˈkræm.bəs//

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Images

Summary

The genus Crambus consists of around 155 species of moths known as crambid snout moths, recognized for their slender physique and distinctive feeding habits as larvae, primarily on grasses. They are prevalent in various regions, and their life cycle includes multiple generations per year, often leading to notable impact on turf health.

Physical Characteristics

Adults have slender forewings held close to the body, variably brown to yellowish or whitish with white longitudinal streaks. Long labial palps form a snout. Pupae are pale yellow at first and darken to mahogany brown. Larvae vary in color from greenish to beige, brown, or gray with dark, circular spots. The length of the adults is approximately 12 mm with wingspans of 20–25 mm.

Identification Tips

Look for the slender forewings and long labial palps that extend in front of the heads. Adults can be distinguished based on their color pattern which includes combinations of silver, gold, yellow, brown, and black on their wings.

Habitat

Fields, grassy areas, lawns, waste places; primarily nocturnal and attracted to light.

Distribution

Throughout the United States and southern Canada, and represented throughout Eurasia.

Diet

Larvae feed primarily on grasses, including cool-season grasses, maize, wheat, rye, oats, and timothy-grass.

Life Cycle

Sod webworms have a bivoltine life cycle with four stages: egg, larva, pupa, and imago (adult). They overwinter as larvae and emerge to pupate with the arrival of warm weather, laying eggs in June and appearing as adults from July to August.

Reproduction

Eggs are oval to elliptical, dry, and nonadhesive, ranging in color from white to creamy white initially, turning bright orange or red as they mature.

Predators

Natural predators include birds, insect predators such as ground beetles, robber flies, and predatory wasps.

Ecosystem Role

As herbivores, larvae play a role in local ecosystems, affecting plant populations, particularly in grassy areas.

Economic Impact

Sod webworms can cause significant damage to lawns, golf courses, and other turf due to their feeding habits, especially during droughts.

Collecting Methods

Light traps for adults
Sampling turf for larvae

Preservation Methods

Pinning adults
Preserving larvae in ethanol

Evolution

The genus was first described by Johan Christian Fabricius in 1798, originally encompassing species now classified in Noctuidae. The type species is Crambus pascuella.