Thyanta perditor

(Fabricius, 1794)

neotropical red-shouldered stink bug, red-shouldered stink bug

Thyanta perditor is a phytophagous native to the Neotropics, now recognized as an agricultural pest in soybean and other crops. are distinguished by a reddish band across the pronotum and lack the long spine found in the similar redbanded stink bug. Laboratory studies demonstrate nymphs require seeds or seed for development, as leaves are unsuitable. The serves as to multiple tachinid fly .

Thyanta perditor by no rights reserved, uploaded by Jade Fortnash. Used under a CC0 license.

Thyanta perditor by (c) Richard Stovall, some rights reserved (CC BY), uploaded by Richard Stovall. Used under a CC-BY license.

Pronunciation

How to pronounce Thyanta perditor: /ˈθaɪ.əntə ˈpɜːdɪtɔr/

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

Identification

Distinguished from the redbanded stink bug (Piezodorus guildinii) by the absence of a long spine protruding between the hind legs on the surface. The redshouldered stink bug has only a short spine in this position. The reddish band across the pronotum is shared with P. guildinii, making ventral examination necessary for positive identification. From other Thyanta , identification requires examination of genitalia or other subtle morphological features.

Images

Appearance

Shield-shaped body with a prominent reddish band across the pronotum (shoulders). Lacks the long, pointed spine on the surface between the hind legs that characterizes Piezodorus guildinii (redbanded stink bug).

Habitat

Agricultural fields, particularly soybean; wild plants including Asteraceae such as Bidens pilosa. In laboratory conditions, nymphs develop successfully on seed of cereals and seeds of various plants, but not on leaves.

Distribution

Caribbean, Central America, North America, South America. Established in southern United States including Texas, with expanding range in Midwestern soybean production areas.

Diet

Phytophagous: feeds on developing seeds and seed . Laboratory studies show successful nymphal development on wheat and barley seed heads, and mature seeds of Bidens pilosa (black jack), green bean pods, maize seeds, and soybean pods. gain weight on all these but show highest on wheat, green bean, and maize. Leaves of all tested plants were unsuitable for nymphal development.

Host Associations

Bidens pilosa - wild plantAsteraceae; nymphs abundant on mature seeds, on seeds
Triticum aestivum - laboratory wheat; seed support nymphal development and weight gain
Hordeum vulgare - laboratory barley; seed support nymphal development
Glycine max - agricultural pest soybean; field pest in Texas and expanding Midwestern range
Zea mays - laboratory maize; most suitable for in laboratory studies
Euthera barbiellini - tachinid fly; most abundant (73% of )
Trichopoda cf. pictipennis - tachinid fly; second most abundant (16.7%)

Life Cycle

: , five nymphal instars, . Eggs barrel-shaped, laid in masses on plant stems. Nymphs require seeds or seed for development; cannot complete development on leaves alone. Duration and success vary by plant quality.

Behavior

Tachinid fly preferentially deposit on the body surface of , particularly the pronotum; wings are least preferred. No difference in egg deposition between upper and under wing surfaces.

Ecological Role

Herbivore specializing on seeds and reproductive structures of plants. for tachinid fly , which may provide services. In agricultural systems, acts as yield-reducing pest of soybean and potentially other seed crops.

Human Relevance

Agricultural pest of soybean in the southern and expanding into the Midwestern United States. Feeding on developing pods and seeds reduces yield, seed quality, and germination rates. Management requires combined counts for threshold-based treatment decisions; specific thresholds for this species versus other stink bugs are not well quantified.

Similar Taxa

Piezodorus guildiniiShares reddish band across pronotum; distinguished by presence of long spine between hind legs, which T. perditor lacks
Thyanta custator accerraCongeneric red-shouldered stink bug found in Midwestern United States; -level identification requires detailed morphological examination

More Details

Parasitoid Biology

Seven tachinid fly parasitize , with Euthera barbiellini and Trichopoda cf. pictipennis dominating. This complex represents potential agents.

Laboratory vs. Field Ecology

Much of the detailed plant and feeding derives from laboratory studies. Field validation of host associations and natural movement patterns between wild and cultivated hosts remains limited.