Calliephialtes grapholithae

(Cresson, 1890)

Calliephialtes grapholithae is an ichneumonid that primarily parasitizes concealed lepidopteran larvae. Its most extensively documented is Cydia caryana (Tortricidae), a key pest of pecan orchards in Mexico and the southern United States. The has been recorded from pecan-growing regions in Coahuila and Tamaulipas, Mexico, and from Kansas, USA. A potential additional host association involves Chalcoela iphitalis (Crambidae), a whose larvae prey on paper wasp larvae within nests; this relationship requires independent confirmation.

Ichneumon Wasp - Flickr - treegrow (7) by Katja Schulz from Washington, D. C., USA. Used under a CC BY 2.0 license.Ichneumon Wasp - Flickr - treegrow (8) by Katja Schulz from Washington, D. C., USA. Used under a CC BY 2.0 license.Ichneumon Wasp - Flickr - treegrow (4) by Katja Schulz from Washington, D. C., USA. Used under a CC BY 2.0 license.

Pronunciation

How to pronounce Calliephialtes grapholithae: /kæl.iːˈfaɪ.æl.tiːz ˌɡræf.əˈlɪθ.i.aɪ/

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

Identification

are ichneumonid wasps with typical characteristics: slender body, long , and a visible ovipositor in females. Males are smaller than females. Accurate identification to level requires examination of wing venation, propodeal structure, and other morphological details; consultation of keys for North American Ichneumonidae is necessary. Distinguished from other Calliephialtes species by genitalic and wing characteristics detailed in taxonomic revisions.

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Habitat

Associated with agroecosystems containing pecan (Carya illinoinensis) orchards in northern Mexico and the southern United States. In Mexico, shows higher abundance at medium-high altitudes (1,470–1,600 m) in localities such as Saltillo, General Cepeda, and Parras de la Fuente (Coahuila). Absent from lower elevation sites (1,110 m) with intensive use in adjacent crops. Also recorded from paper wasp (Polistes metricus) nests in Kansas, USA, though this association appears indirect via a lepidopteran intermediate .

Distribution

Mexico: Coahuila (Saltillo, General Cepeda, Parras de la Fuente, Torreón—absent), Tamaulipas (Jaumave). United States: Kansas (Leavenworth), Hawaii (presence recorded in GBIF). Native range corresponds to pecan distribution in northern Mexico and southern United States.

Seasonality

observed in mid-November in Kansas, USA. Activity in Mexican pecan orchards documented during 2019–2020 field seasons, with emergence from incubated pecan husks collected during the growing season.

Host Associations

Behavior

females locate concealed lepidopteran larvae within plant tissues or protective structures (pecan husks, bagworm cases) and oviposit using a long ovipositor. Laboratory rearing from pecan husks involves incubation of damaged fruits in controlled conditions to obtain adult . The mechanism by which females might access within defended paper wasp nests remains undescribed.

Ecological Role

agent of lepidopteran pests, particularly Cydia caryana in pecan agroecosystems. Contributes to natural enemy diversity in agricultural landscapes. Absence from sites with intensive use suggests sensitivity to chemical management practices, with implications for strategies.

Human Relevance

Of interest for of Cydia caryana, an economically significant pest of pecan production. Laboratory rearing protocols have been developed to maintain using artificial diets for the . Potential for in pecan orchards, particularly at higher elevations where chemical pressure is reduced.

Similar Taxa

  • Phanerotoma fasciataCo-occurring braconid of Cydia caryana in Mexican pecan orchards; distinguished by -level characters (Ichneumonidae vs. Braconidae), including presence of areolet in forewing and different antennal structure.
  • Eupelmus sp.Co-emergent from pecan husks in Tamaulipas; distinguished by characters (Eupelmidae: compact body, metallic coloration, reduced wing venation). Status as or hyperparasitoid of C. caryana unconfirmed.

More Details

Host specificity pattern

Known share ecological trait of 'concealed' larval stages—within pecan husks, bagworm cases, or nests. This pattern suggests specialized foraging for hosts in protected microhabitats rather than exposed foliage-feeding larvae.

Altitudinal distribution factors

Higher abundance at 1,470–1,600 m versus absence at 1,110 m in Coahuila correlates with reduced use in adjacent crops (cotton) at higher elevations, though direct causal link requires experimental verification.

Taxonomic note

Original description by Cresson (1890). Spelling variants in literature include 'Calliephiates' (erroneous) in some Mexican publications.

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Sources and further reading