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Filtering by: Creator Stimmann, Michael W.

Thelytokous and dioecious populations of Phenacaspis pinifoliae (Fitch), (Homoptera : Diaspididae)

Creator:

Stimmann, Michael W.

Abstract:

Two populations of the pine needle scale, Phenacaspis pinifoliae (Fitch), were studied. One population was located in Corvallis, Oregon, and the other population was located near Santiam Pass, Oregon. Both populations were feeding on Pinus contorta. The Corvallis population was unisexual, univoltine, and over wintered as both eggs and adult...

Resource Type:

Masters Thesis
Some factors affecting aphid transmission of cucumber mosaic virus

Creator:

Stimmann, Michael W.

Abstract:

The frequency of aphid transmission of cucumber mosaic virus from diseased plants at different times after inoculation was determined. A cycle of infectious virus was found. Primary leaves of lima bean plants were inoculated mechanically when the first trifoliate leaf appeared and were kept at different temperatures. At 24° C...

Resource Type:

Dissertation