Ecology of anthocorid (Hemipt.: Anthocoridae) predators of the pear psylla (Homopt.: Psyllidae) in the Okanagan Valley, British Columbia

G. J. Fields, B. P. Beirne

Abstract


The supposition is not valid that the disappearance of the native <i>Anthocoris melanocerus</i> from pear orchards late in the summer is because of competitive displacement by the introduced <i>A. nemoralis</i>. It is because <i>A. melanocerus</i> migrates to where prey are most abundant whereas <i>A. nemoralis</i> remains on pear. <i>A. melanocerus</i> is concentrated on willows in the spring, moves to pear when <i>Psylla pyricola</i> becomes abundant, and moves to cottonwood when aphids on it become abundant and the numbers of <i>P. pyricola</i> on pear have become low.

Keywords


Homoptera; Psyllidae; Hemipteral Anthocoridae

Full Text:

PDF

References


DeBach, P. 1966. The competitive displacement and coexistence principles. Ann. Re v. Ent. 11:183-2 12

DeBach, P. and R.A. Sundby. 1963. Competitive displacement between ecological homologues. Hilgardia 34:105-166.

McMullen, R.D. 1971. Psylla pyricola Forster, pear psylla (Hemiptera: Psyllidae). In Biological Control Programmes against Insects and Weeds in Canada 1959-1968. Commonwealth Inst. Biol. Cont. Tech. Comm. 4:33-38.

McMullen, R.D. and C. Jong. 1967. New records and discussions of the pear psylla, Psylla pyricola Forster, in British Columbia. J. Ent . Soc. Br. Columb. 64:35-40.

Turnbull, A.L. and D.A. Chant. 1961. The practice and theory of biological control in Canada. Can. J. Zoo I. 39:677-753.


Refbacks

  • There are currently no refbacks.