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Ecology of two microlepidopteran leaf-rollers in an arid-land riparian forest


, : Ecology of two microlepidopteran leaf-rollers in an arid-land riparian forest. Southwestern Naturalist 42(2): 155-161

The abundance, host preferences, and causes of mortality of the tortricid, Archips argyrospila, and the gelechiid, Anacampsis innocuella, were studied at the Rio Grande Nature Center, Albuquerque, New Mexico, in a riparian forest dominated by native cottonwood, Populus deltoides subsp. wislizenii, and introduced Russian olive, Eleagnus angustifolia. Caterpillars of these species rolled and tied 8.2% of the leaves on eight study trees in 1992. In feeding tests, larvae of both species ate leaves of a wide variety of the plants at the site. However, actual larval distribution favored cottonwood (moderately by Archips, strongly by Anacampsis). Field distribution can largely be explained by oviposition preferences: significantly more egg clusters were laid by Archips females on cottonwood twigs, and significantly more egg groups were laid by Anacampsis females in cottonwood bark crevices, than were laid on other experimental substrates. Causes of mortality include predation, parasitism, and failure to hatch from the egg.

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