Papaipema harrisii
Grote, 1881
cow parsnip borer moth, heracleum stem borer
Papaipema harrisii is a noctuid whose larvae bore into the stems of cow parsnip (Heracleum spp.) and related plants. are active in late summer and fall. The is distributed across northern North America, particularly in prairie and regions where plants occur.
Pronunciation
How to pronounce Papaipema harrisii: //pəˌpaɪˈpɛmə ˈhæɹɪsi.aɪ//
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Identification
are identified by their dull brown coloration with irregular darker forewing patterns and association with Heracleum plants. They resemble other Papaipema but can be distinguished by genitalia examination and geographic range. Larvae are recognized by their stem-boring habit in cow parsnip and related umbellifers, with the characteristic reduced structure of the .
Appearance
have a wingspan of approximately 25-35 mm. Forewings are dull brown to grayish-brown with irregular darker markings and a slightly pointed apex. Hindwings are pale grayish-brown with darker terminal shading. The body is robust and covered with fine . Larvae are creamy white to pale pink with a brown capsule and reduced , adapted for stem-boring.
Habitat
Found in moist meadows, riparian corridors, forest edges, and prairie wetlands where cow parsnip and related umbellifers grow. Requires stands of larval plants for .
Distribution
North America: recorded from Alberta, Manitoba, and Saskatchewan in Canada, with broader distribution across northern United States and Canadian prairie provinces and regions.
Seasonality
fly from late August through October, with peak activity in September. Larvae are present within plant stems during the growing season.
Diet
Larvae bore into and feed on the pith of stems and roots of cow parsnip (Heracleum maximum, H. lanatum) and possibly related Apiaceae. feeding habits are unknown.
Host Associations
- Heracleum maximum - larval primary , stem borer
- Heracleum lanatum - larval stem borer
Life Cycle
are laid on or near plants. Larvae bore into stems and descend to root crowns, where they overwinter. occurs in spring or early summer within the host plant or in soil. emerge in late summer. One per year.
Behavior
Larvae are concealed feeders, tunneling within plant stems and roots. are and attracted to light. They are rarely observed visiting flowers.
Ecological Role
Larvae act as stem borers in native umbellifers, potentially influencing plant vigor and . They serve as prey for and other natural enemies. The is part of the native herbivore in wetland and meadow .
Human Relevance
No significant economic impact. Occasionally encountered by botanists and entomologists surveying wetland vegetation. Not a pest of cultivated crops.
Similar Taxa
- Papaipema polyxenesalso feeds on Apiaceae, but associated with different plants (e.g., Angelica, Pastinaca) and has more contrasting forewing pattern
- Papaipema inquaesitasimilar size and coloration, but feeds on thistles (Cirsium) and has different genitalia structure
- Papaipema pterisiioverlapping range, but feeds on bracken fern (Pteridium) and has more uniformly dark forewings