Title page for ETD etd-05092009-040452
|Type of Document
||Jefferson, David Kirk
||Euonymus scale, Unaspis euonymi (Comstock) :host preference, and distribution of native and imported natural enemies in Virginia
||Master of Science
|Schultz, Peter B.
|Pfeiffer, Douglas G.
|Date of Defense
Studies were conducted in 1992 and 1993 to determine which of six Euonymus
species and cultivars would sustain the highest populations of Unaspis euonymi
(Comstock), as a food source for Chilocorus kuwanae (Silvestri). Analysis of data
collected from field-grown plants and container-grown plants indicates that
Euonymus japonicus (Thunb.) 'Albo-marginatus' would sustain the highest
populations of U. euonymi.
In 1992 and 1993, surveys were conducted to determine the presence of
existing natural enemies in Virginia as well as to determine the establishment of
the imported predator, Chilocarus kuwanae. In 1992, C. kuwanae and parasites
from the genera Aspidiatiphagus and Encarsia was found at several locations in
Virginia Beach. In 1993, C. kuvanae was recovered in seven of the twelve
Virginia counties surveyed. Either Aspidiotiphagus or Encarsia were found in
nine of the twelve counties. A single specimen of Cybocephalus sp. was
recovered from a sample taken in Fredericksburg.
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