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The potential of endemic natural enemies to suppress pear psylla, Cacopsylla pyricola Förster, in the Hood River Valley, Oregon

Creator:

Booth, Steven R.

Abstract:

This thesis addressed the potential of endemic predaceous and parasitic arthropods of the Hood River Valley, Oregon to suppress the pear psylla, Cacopsylla pyricola F8rster. Natural enemies adequately suppressed psylla in three of seven unsprayed orchards of differing vegetational settings, orchard age, and size. Relatively few psylla natural enemies dispersed...

Resource Type:

Dissertation

Full Text:

psylla, Cacopsylla pyricola Förster, in the Hood River Valley, Oregon AN ABSTRACT OF THE THESIS OF
Factors influencing pesticide resistance in Psylla pyricola Foerster and susceptibilty in its mirid predator, Deraeocoris brevis Knight

Creator:

Baan, Hugo E., van de

Abstract:

Factors influencing pesticide susceptibility and resistance were studied in Psylla pyricola Foerster, and its mirid predator, Deraeocoris brevis Knight in the Rogue River Valley, Oregon. Factors studied were at the biochemical, life history, and population ecology levels. Studies on detoxification enzymes showed that glutathione S-transferase and cytochrome P-450 monooxygenase activities...

Resource Type:

Dissertation

Full Text:

-form. In Oregon, summer- form psylla has three generations per year and the winter-form psylla has