Publications for:

pest = Eriosoma lanigerum
beneficial = Syrphus rectus (predator)

found 2 publications:

2008

Ecological and life-history notes on syrphid predators of woolly apple aphid in Virginia, with emphasis on Heringia calcarata
BioControl (2008) 53 (5), 773-786
publishers website - pestinfo wiki

2004

Feeding and egg distribution studies of Heringia calcarata (Diptera: Syrphidae), a specialized predator of woolly apple aphid (Homoptera: Eriosomatidae) in Virginia apple orchards
Journal of Economic Entomology (2004) 97 (3), 813-819
publishers website - pestinfo wiki