Pangaeus bilineatus

(Say, 1825)

peanut burrower bug, Two-lined Burrowing Bug

Pangaeus bilineatus, commonly known as the peanut , is a soil-dwelling in the . It is a major agricultural pest of peanut in the southeastern United States, where it causes significant by feeding underground on developing peanut kernels. The exhibits a single per year in most regions, with entering in soil during winter months. Its subterranean lifestyle renders conventional foliar applications ineffective, necessitating specialized approaches.

Pangaeus bilineatus by (c) Justin Williams, some rights reserved (CC BY), uploaded by Justin Williams. Used under a CC-BY license.

Burrowing Bug - Pangaeus bilineatus, Natchez Trace, near Natchez, Mississippi by Judy Gallagher. Used under a CC BY 2.0 license.

Pangaeus bilineatus (44416043104) by Donald Hobern from Copenhagen, Denmark. Used under a CC BY 2.0 license.

Pronunciation

How to pronounce Pangaeus bilineatus: //pænˈdʒiːəs bɪlɪˈneɪtəs//

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

Identification

Distinguished from other burrowing by its association with peanut agroecosystems and specific two-lined color pattern (implied by specific epithet "bilineatus"). possess modified forelegs adapted for digging through soil. Newly emerged adults (0-4 hours post-) display orange coloration before full . Last nymphal identifiable by presence of .

Images

Habitat

Sandy soils in agricultural fields, particularly peanut production systems; also occurs in weedy field margins and adjacent uncultivated areas with suitable soil texture. Subterranean environment within soil profile where peanut pods develop. overwinter in soil, undergoing during winter months.

Distribution

Southeastern United States (Florida, Georgia, Alabama, southern Virginia to Texas); Caribbean; Central America; North America broadly; Hawaii. Core economic impact concentrated in peanut-growing regions of the Southeast United States.

Seasonality

overwinter in soil , terminating in early spring when soil temperatures warm. Peak adult abundance during peanut pod development (July-August in most regions). Active observed during late winter months in Georgia. Single per year in most areas.

Diet

Developing peanut kernels (Arachis hypogaea) using needle-like . Also feeds on other legume including soybeans (Glycine max) and cowpeas (Vigna unguiculata), and may feed on seeds of various weeds when cultivated unavailable.

Host Associations

Arachis hypogaea - primary peanut; major agricultural pest
Glycine max - secondary soybean
Vigna unguiculata - secondary cowpea

Life Cycle

Single per year in most regions. Females singly or in small clusters in soil at depths of 1-3 inches near roots; egg incubation approximately 1-2 weeks. develop through five over 4-6 weeks; last instar distinguished by . Total developmental time from egg to approximately 6-8 weeks depending on temperature. Adults present from late spring through fall.

Behavior

Strong burrowing using modified forelegs to dig through soil. Negative leads individuals to move upward in soil profile to locate developing peanut pods. behavior observed around preferred food sources. Capable of long-distance for between fields. and live primarily in soil, rendering foliar applications ineffective. Nymphs less susceptible than adults to nematodes. tillage practices (strip-tillage, no-till) associated with higher levels; corn-peanut with strip-tilling into corn residues increases F1 adult , possibly due to survival on harvest-loss peanut seeds.

Ecological Role

Agricultural pest causing direct to peanut production; infested peanuts may be discounted by ≤50% of market price. Feeding wounds on peanut pods create entry points for secondary fungal including flavus, leading to aflatoxin and food safety issues. associated with reduced oxidative and increased peroxide levels in peanut kernels. Limited role as seed in non-agricultural .

Human Relevance

Major economic pest of peanut in southern United States. Difficult to control due to subterranean feeding habits. Chlorpyrifos historically the only labeled but deregistered, creating urgent need for alternatives. Combined applications of Steinernema carpocapsae ( nematode) and imidacloprid show synergistic mortality effects at 3-5 days post-inoculation and additive effects at 7-14 days, with no negative impact on nematode . Management strategies include crop , deep tillage to bury , and careful timing of control measures to peak adult activity.

Similar Taxa

Other Pangaeus speciesSame , different associations and geographic distributions; P. bilineatus specifically associated with peanut agroecosystems
Other Cydnidae (burrowing bugs)Share and soil-dwelling habit; distinguished by specific associations and two-lined pattern

More Details

Pest Management Challenges

Control is uniquely difficult because the attacks peanut pods underground, rendering foliar applications ineffective. This has driven research into nematodes and combined chemical-microbial approaches.

Aflatoxin Connection

Feeding damage creates entry points for flavus, which produces carcinogenic aflatoxins. This secondary can render peanuts unfit for human or animal consumption, amplifying economic losses beyond direct feeding damage.