Frumenta nundinella

(Zeller, 1873)

Mottled Twirler

Frumenta nundinella is a with two per year in temperate North America. It is an obligate on Solanum carolinense (horsenettle), with inducing characteristic leaf shelters in the first generation and feeding within fruits in the second generation. The is notable for inducing parthenocarpic fruit development in its , creating within which larvae complete development. overwinter and emerge to oviposit on new shoot tips in late spring.

Frumenta nundinella by (c) Nick Block, some rights reserved (CC BY), uploaded by Nick Block. Used under a CC-BY license.

Frumenta nundinella by the Smithsonian. Used under a CC0 license.

Pronunciation

How to pronounce Frumenta nundinella: /fruːˈmɛn.tə ˌnʊn.dɪˈnɛl.lə/

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

Identification

Recognizable by the combination of pale buff with indefinite dark markings and the distinctive larval biology. First- create tight, round, hollow leaf shelters on shoots of Solanum carolinense. Second-generation larvae develop within fruits, with infested berries showing characteristic appearance only from the fourth onward. Mature larvae create exit holes sealed with thin before . Similar lack this specific association and shelter-making .

Images

Appearance

Wingspan approximately 24 mm. pale buff or cream with ochreous shadings, sparsely dusted with blackish , and marked with numerous indefinite blackish or dark steel grey markings. silky cinereous with slight iridescence.

Habitat

Associated with Solanum carolinense (horsenettle) plants, often in small, isolated . typically occurs in disturbed , agricultural edges, and open fields in eastern North America.

Distribution

North America: eastern United States (Alabama, Arkansas, Illinois, Indiana, Kentucky, Louisiana, Michigan, Mississippi, North Carolina, Ohio, Oklahoma, South Carolina, Tennessee, Texas) and Canada (first record reported, specific locality not detailed in available sources).

Seasonality

Two per year in southwestern Virginia. First generation: emerge late June to early August. Second generation: adults emerge late August to late September. adults oviposit in late May.

Diet

feed exclusively on Solanum carolinense. First : shoots, incipient flower , and infolded leaf edges. Second generation: developing fruits and seeds; a single larva can destroy all seeds within a berry. diet not documented.

Host Associations

Solanum carolinense - obligate Only known ; feed on shoots (first ) and fruits (second generation)

Life Cycle

Two per year; complete -to- cycle approximately 50 days per generation. adults lay eggs on tips of emerging shoots in late May. First generation: feed on growth in mid-June, each enclosed in a leaf shelter; mid-June to July; adult late June to early August. Second generation: larvae feed on fruits, pupate inside berries; adult emergence late August to late September.

Behavior

First- construct individual, tight, hollow, spherical shelters from folded leaves. Second-generation larvae pupate within fruits after creating exit holes sealed with thin . Larval feeding induces parthenocarpic fruit development, effectively the host tissue.

Ecological Role

and seed of Solanum carolinense. Low natural rates in studied . Potential agent for horsenettle due to destructive seed-feeding capacity of second- .

Human Relevance

Studied as a potential agent for Solanum carolinense, a weedy with agricultural and veterinary significance. No other documented economic or cultural importance.

Similar Taxa

Other Gelechiidae on SolanumLack the distinctive two- feeding strategy with leaf shelters in first generation and fruit- in second generation; differs
Tuta absolutaAlso in but feeds on tomato and other Solanaceae; does not induce parthenocarpic or construct leaf shelters

More Details

Gall induction mechanism

Larval feeding induces parthenocarpic fruit development in Solanum carolinense, creating that provide protected development sites. This represents a derived interaction with the beyond simple .

Detection difficulty

Second- fruit are not easily detected until reach the fourth , at which point berries develop a characteristic appearance. This cryptic early stage may contribute to low observed infestation rates in field surveys.