An unusual manifestation in the natural control of the pear psylla, Psylla pyricola Foerst

J. Marshall


pear psylla; <i>Psylla pyricola</i> Foerst

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Bonnemaison, L. and J. Missonnier. 1956. Le psylle du poirier (psylla pyricola L.) Morphologie et biologle. Methodes de lutte. Ann Epiphyties 2:263-331.

Marshall, J. and H.F. Olds. 1947. The pear psylla in British Columbia. Proc. Ent. Soc. British Columbia 43:1-3.

Slingerland, M.V. 1892. The pear tree psylla. Cornell Unlv. Agr. Exp. Sta. Bull. 44:151-186.


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