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dc.contributor.authorPaulsen, Christian Michael
dc.date.accessioned2014-03-04T20:00:23Z
dc.date.available2014-03-04T20:00:23Z
dc.date.issued2011-05
dc.identifier.otherpaulsen_christian_m_201105_ms
dc.identifier.urihttp://purl.galileo.usg.edu/uga_etd/paulsen_christian_m_201105_ms
dc.identifier.urihttp://hdl.handle.net/10724/27262
dc.description.abstractAn orchard survey determined that nymphs of M. caryaefoliae regularly feed on both surfaces of pecan foliage, while other pecan aphids feed predominately on the lower leaf surface. Aphid populations on laboratory pecan seedlings were similarly distributed. Comparison of M. caryaefoliae nymphs reared on each leaf surface found the upper surface offers no fitness advantage. Observations of aphid density found evidence that crowding by heterospecific aphids contributes to M. caryaefoliae movement to the upper surface, while conspecific crowding has no effect. Field observations and experiments on laboratory seedlings found that some aphidophagous lady beetle and lacewing larvae predominately search the lower leaf surface for prey. M. caryaefoliae may settle on the upper leaf surface because it is a habitat with reduced probability of enemy encounters.
dc.languageeng
dc.publisheruga
dc.rightspublic
dc.subjectMelanocallis caryaefoliae
dc.subjectAphididae
dc.subjectHomoptera
dc.subjectenemy-free space
dc.subjectfoliage-feeding
dc.subjectcrowding
dc.subjectMonellia caryella
dc.subjectMonelliopsis pecanis
dc.subjectCoccinellidae
dc.subjectChrysopidae
dc.titleThe distribution of the black pecan aphid Melanocallis caryaefoliae (Homoptera: Aphididae) between the upper and lower surfaces of pecan foliage
dc.typeThesis
dc.description.degreeMS
dc.description.departmentEntomology Graduate Program
dc.description.majorEntomology
dc.description.advisorJohn Ruberson
dc.description.committeeJohn Ruberson
dc.description.committeeKerry Oliver
dc.description.committeeDan Horton
dc.description.committeeTed Cottrell


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