Debnath, S., & Handique, R. 1991 Hedera helix L., a new host (colateral host) for Chrysomphalus aonidium (=ficus) Ashmead -- a scale insect pest of tea.. Two and a Bud 38(1-2): 39-40.

Notes: Abstract: Black scale insect has previously been recorded on young tea plants, causing extensive damage; recently it has been found to inhabit Hedera helix, English ivy, as an alternate host; recommendation for chemical treatment.