Also psyl·lid [sil-id] /ˈsɪl ɪd/.
Origin of psylla
< New Latin (1811) Psylla genus name < Greek psýlla flea
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for psylla
Kieffer and related hybrids are somewhat immune to San Jose scale, but are very susceptible to psylla.
Other pests, as psylla, the scab-fungus, and codling-moth beset the pear and make profits uncertain.
The psylla is a minute, sucking insect, wingless in its immature stages, but winged and very active as an adult.
The psylla, while irregular in its outbreaks, is most damaging and hard to control when it appears.