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Filtering by: Subject Pear -- Diseases and pests -- Oregon Decade 1990-1999 Degree Level Doctoral

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:

non-pear plant hosts, and to assess their role in selective pest control programs in commercial pear
Effects of intercropping beans with maize on angular leaf spot and rust of beans

Creator:

Boudreau, Mark Alan, 1958-

Abstract:

Experiments were performed to determine the nature of maize influence on bean disease in additive-type intercrops. Overall effects of intercrops on angular leaf spot (caused by Phaeoisariopsis griseola) in Kenya indicated >23% reductions (P<0.05) in area under the disease progress curve (AUDPC) in two of three season-site combinations. Fertilization tended...

Resource Type:

Dissertation

Full Text:

), pest control, efficient use of nutrients, and, of interest to us here, disease control (14). One must