Origin of psylla
Examples from the Web for psylla
Historical Examples of 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.