Abstract
THE apple-sucker, a serious pest of orchards, has long been known to breed on species of Pyrus, chiefly P. malus, and has been reported to occur on hawthorn, though definite record of its breeding on this plant is lacking. My observations on the biology of Scottish Psyllidse (Hemiptera-Homoptera) have shown that in south-east Scotland Psyllia mali regularly breeds on various species of Crutaegus and is, in fact, identical with, and only a seasonal form of, Psyllia peregrina, Först, recorded from hawthorn. The nymphs of these insects on hawthorn, however, differ slightly from those of the apple-sucker, and this fact, coupled with their habit of being confined to different host genera has been probably responsible for the two specific names under which they have been so far known.
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Vide his synonymy of P. mali, cited by Speyer, W., in “Der Apfelblattsanger”, 1929. Berlin.
This species, which was reared by me, is being described by Dr. H. F. Barnes of the Rotliamsted Experimental Station.
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LAL, K. Biological Races in Psyllia mali, Schmidberger. Nature 132, 934 (1933). https://doi.org/10.1038/132934a0
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DOI: https://doi.org/10.1038/132934a0
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