Iowa State University Capstones, Theses and Retrospective Theses and Dissertations Dissertations 1958 Transmission and latency of cherry necrotic ring spot virus in Prunus tomentosa Glen Walter Peterson Iowa State College Follow this and additional works at: https://lib.dr.iastate.edu/rtd Part of the Botany Commons Recommended Citation Peterson, Glen Walter, "Transmission and latency of cherry necrotic ring spot virus in Prunus tomentosa " (1958). Retrospective Theses and Dissertations. 1639. https://lib.dr.iastate.edu/rtd/1639 This Dissertation is brought to you for free and open access by the Iowa State University Capstones, Theses and Dissertations at Iowa State University Digital Repository. It has been accepted for inclusion in Retrospective Theses and Dissertations by an authorized administrator of Iowa State University Digital Repository. For more information, please contact
[email protected]. TRANSMISSION AND LATENCY OF CHERRY NECROTIC RING SPOT VIRUS IN PRUNUS TOMENTOSA Glenn Walter Peterson A Dissertation Submitted to the Graduate Faculty in Partial Fulfillment of The Requirements for the Degree of DOCTOR OF PHILOSOPHY Major Subject: Plant Pathology Approved: Signature was redacted for privacy. In Charge of Major Work Signature was redacted for privacy. Head of Major Department Signature was redacted for privacy. Iowa State College 1958 il TABLE OF CONTENTS INTRODUCTION 1 REVIEW OF LITERATURE 3 MATERIALS AND METHODS 19 Virus Sources .. 19 Trees 19 Handling of Trees 21 Inoculations 22 EXPERIMENTS 24 Latency 24 Symptom expression of necrotic ring spot virus infected P. tomentosa seedlings one year after inoculation 25 Symptom expression of necrotic ring spot virus infected P. tomentosa seedlings after defoliation 32 Transmission 34 Contact periods required for the transmission of necrotic ring spot virus 35 P.