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Filtering by: Subject Pears -- Diseases and pests Degree Name Master of Arts (M.A.)

Seasonal activities of two species of eriophyid mites on holly and their relation to foliage damage

Creator:

Welton, Richard Elroy

Resource Type:

Masters Thesis

Full Text:

pear and apple leaves in response to the feeding of blister mites. Another type of holly
Torymus festivus n. sp.: a parasite of Dasyneura sp., (Hymen:Chalcidoidea Torymidae)

Creator:

Hobbs, Kenneth Rollin

Resource Type:

Masters Thesis

Full Text:

problem could be worked out for the nster thesis. The Itonidiclae host be1ons to the genus Dasneura and
The parasite complex of the pea aphid, Acyrthosiphon pisum (Harris) on alfalfa in western Oregon

Creator:

Dickie, Alfred Gordon

Abstract:

This study was initiated in the Spring of 1966 for the purpose of determining the present status and effectiveness of imported parasitic wasps of the pea aphid in the Willamette Valley of western Oregon. The pea aphid is a serious pest throughout the pea and alfalfa growing regions of the...

Resource Type:

Masters Thesis

Full Text:

pest throughout the pea and alfalfa growing sections of the United States and Canada. Plants attacked