ORIGINAL ARTICLE
Management of Potato virus Y (PVY–NTN) causing PTNRD disease in potato by prior treatment with a mild PVY strain
 
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Department of Plant Pathology, Faculty of Agriculture, Assiut University, Assiut Governorate 71515, Egypt
Submission date: 2017-12-15
Acceptance date: 2018-02-07
 
Journal of Plant Protection Research 2018;58(2):130–136
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ABSTRACT:
Potato virus Y (PVY) is one of the most destructive viruses infecting potato in Egypt and worldwide. Recent study showed that a necrotic PVY-NTNstrain is infecting potato in Upper Egypt. Chemical control is not effective to control this viral pathogen. Another alternative to control PVY infecting potato is using a mild PVY strain to elicit systemic cross protection in potato plants against infection with a severe necrotic strain of PVY. Results of this study showed that a PVY necrotic strain produced a significant lesser number of local lesions on diagnostic plant (Pseudo acacia), when these plants were treated first with a mild PVY strain. Data obtained from greenhouse and field experiments indicated that treatment of potato plants "Burna" variety with a mild PVY strain significantly protected potato from infection with a severe necrotic PVY strain, and resulted in a significant increase in tuber yield compared with infected plants without prior treatment with a mild PVY strain. The highest increase in potato tuber yield was obtained when potato plants were inoculated with a mild PVY strain three days before challenging with the severe necrotic PVY strain. This study proved that using a mild strain of PVY can significantly protect potato plant from infection with a severe strain of this virus under both greenhouse and field conditions and can present a potential method to reduce losses due to infection of this virus in Assiut governorate and Upper Egypt.
CORRESPONDING AUTHOR:
Osama A. Abdalla   
Department of Plant Pathology, Faculty of Agriculture, Assiut University, Assiut Governorate 71515, Egypt
 
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