|Hickory (Carya sp.) is an unknown host for Erynnis juvenalis. All current literature list Oak (Quercus) (many species) as the sole host plant.
In the late summer and fall of 2001, I found numerous larvae on Quercus species as well as Carya pallida and Carya tomentosa (see page on later stages on Carya). These were in various stages of maturity, including penultimate stages ready to overwinter (see page on color change). It was suggested that these could have moved off of Ouercus in later stages, and early stages should be searched for on Carya to show that this was a suitable host.
The pictures above show that early stages do occur, and thrive on Carya. Since all of these are "wild" larvae, instars were estimated on size and pre-molt stages that were seen. Obviously, these stages did not move off Quercus, and in most occurrences, the nearest oak was far from the Carya host with the early instar larvae. Early instar larvae are feeding, growing normally, and thriving on Carya, indicating it is a perfectly good secondary host for Erynnis juvenalis.
|The pictures below are of two Erynnis horatius larvae for comparison. I have not found these on any host but Quercus. Although the eggs were probably deposited in a similar time period, E. horatius develops much faster than E. juvenalis, because they are double brooded. This species only ever shows faint yellowish tones, and develops the white subdorsal stripes early. This stripe in E. juvenalis is always yellow, even on older, mature larvae, that become much paler. (see page on E. horatius larvae development)
For comparison pictures, of the larvae of all four species of southen NJ Erynnis, and identification notes, GO HERE