Environmental Entomology (1985) 14, 122-126
H.-T. Liao, M.K. Harris, F.E. Gilstrap and F. Mansour (1985)
Impact of natural enemies on the blackmargined pecan aphid, Monellia caryella (Homoptera: Aphidae)
Environmental Entomology 14 (2), 122-126
Abstract: Populations of the blackmargined pecan aphid, Monellia caryella (Fitch), were studied in the field, using sleeve cages to manipulate aphid populations and their natural enemies. Each cage enclosed 10 compound pecan leaves. M. caryella populations were observed to increase rapidly within closed cages from 1 aphid per leaf to 50 aphids per leaf at any time throughout the summer. Opening sleeve cages to allow natural enemies access to the increasing aphid populations always resulted in the decline of aphid numbers compared to their activity in adjacent closed cages. Release of 1 chrysopid or 1 coccinellid larvae per 10 leaves when aphid populations were increasing in closed cages always resulted in the prevention of an aphid outbreak. Laboratory feeding studies of selected chrysopid and coccinellid predators showed average feeding rates of between 25 and 60 aphids per day. Results indicate that natural enemies, particularly predators, play an important role in maintaining M. caryella populations at low levels in the field.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
Database assignments for author(s): Marvin K. Harris
Research topic(s) for pests/diseases/weeds:
biocontrol - natural enemies
population dynamics/ epidemiology
Research topic(s) for beneficials or antagonists:
general biology - morphology - evolution
