Neohydatothrips variabilis

(Beach, 1896)

soybean thrips

Neohydatothrips variabilis, commonly known as the soybean , is a phytophagous thrips in the Thripidae and the most efficient known of Soybean Orthotospovirus (SVNV). The species has been documented in Central America and North America, with prevalent across all soybean-growing states in the United States. Research indicates that SVNV enhances vector by increasing survival, longevity, and reproductive parameters while decreasing population doubling time. The species reproduces through with , producing haploid males from unfertilized .

Pronunciation

How to pronounce Neohydatothrips variabilis: /niː.oʊˌhaɪdətoʊˌθrɪps ˌvɛəriˈæbɪlɪs/

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

Identification

Distinguished from other by its specific association with soybean (Glycine max) and its role as the predominant of Soybean Orthotospovirus. Molecular identification methods have been employed in research settings. The species transmits SVNV 2.5 times more efficiently than Frankliniella fusca and 10 times more efficiently than Frankliniella tritici.

Appearance

are minute, slender insects approximately 1 millimeter in length with fringed wings visible under magnification. Body form is characteristic of : elongated and narrow. Coloration details are not specifically documented in available sources.

Habitat

Soybean fields, particularly in the upper leaves during daytime. become prominent in late season in northern North America. Laboratory rearing occurs on soybean plants in controlled environmental conditions (25±2°C, 80% humidity, 14:10 light:dark cycle).

Distribution

Central America; North America; United States (all soybean-growing states); Canada; Pakistan. SVNV has been reported in Egypt, though N. variabilis presence there is unconfirmed. GBIF records include Iowa, USA.

Seasonality

Arrives later in the growing season, becoming predominant in late season in northern North America. Early-season have not been found to cause yield loss; damaging occur later in the growing season.

Diet

Phytophagous; feeds on soybean plants (Glycine max). Uses rasping and sucking mouthparts to abrade tender plant tissue and consume leaking plant fluids.

Host Associations

Glycine max - primary plantsoybean
Soybean Vein Necrosis Orthotospovirus (SVNV) - most efficient ; persistent, circulative, propagative transmission

Life Cycle

→ larval stage 1 (L1, ~4 days) → larval stage 2 (L2, ~3.8 days infected or ~2.4 days uninfected) → pre-pupae (P1, ~2.8 days) → pupae (P2, ~2.5 days) → . Virus acquisition occurs during L1-L2 feeding on infected plants. Total life ~9 days (infected) or ~7.6 days (uninfected). Adult longevity ~19 days females, ~9 days males (infected); ~17 days females, ~7.6 days males (uninfected). Sex determination is haplodiploid: haploid males develop from unfertilized eggs via ; females develop from fertilized eggs.

Behavior

activity concentrated on upper leaves. are deposited into parenchymatous tissue alongside leaf . Movement of eggs through the ovipositor involves back-and-forth 'rocking' movement of the first valvulae and valvifer. The appendage gland likely secretes lubrication to facilitate egg movement through external genitalia.

Ecological Role

Primary of Soybean Orthotospovirus (SVNV), contributing to spread of viral that reduces soybean yield and seed oil content. Virus-vector interaction enhances vector , potentially increasing disease pressure. Serves as prey for the predatory Orius insidiosus, a candidate agent.

Human Relevance

Major agricultural pest threatening soybean production. Damage includes leaf deformation with silvery areas and black excrement resembling pepper grains. Late-season under drought stress can cause premature defoliation and yield reduction. Virus transmission reduces seed oil content and profiles in infected plants. Research target for interference-based pest management strategies.

Similar Taxa

Frankliniella fuscaAlso SVNV but with 2.5× lower transmission than N. variabilis
Frankliniella triticiAlso SVNV but with 10× lower transmission than N. variabilis

More Details

Virus-vector interaction

SVNV enhances N. variabilis : infected show higher (r), finite rate of increase (λ), and mortality index (qx), with female-biased sex ratios. Infected females produce ~89 lifetime versus ~84 in uninfected females.

Female reproductive morphology

First study describing internal and external genitalia used serial block- scanning electron microscopy and confocal laser scanning microscopy. Female : two panoistic ovaries with eight each, , spermatheca, accessory glands, appendage gland, common oviduct, and vagina. Seven muscles operate external genitalia.