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
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.
Osama A. Abdalla   
Department of Plant Pathology, Faculty of Agriculture, Assiut University, Assiut Governorate 71515, Egypt
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