Origin of psylla
Examples from the Web for psylla
The psylla, while irregular in its outbreaks, is most damaging and hard to control when it appears.
Other pests, as psylla, the scab-fungus, and codling-moth beset the pear and make profits uncertain.
Kieffer and related hybrids are somewhat immune to San Jose scale, but are very susceptible to psylla.
The psylla is a minute, sucking insect, wingless in its immature stages, but winged and very active as an adult.