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العنوان
STUDIES ON SHARKA DISEASE IN EGYPT /
المؤلف
GHANIM,HUSSEIN ABOELELA MOSTAFA.
هيئة الاعداد
باحث / HUSSEIN ABOELELA MOSTAFA GHANIM
مشرف / Hosny Aly Younes
مشرف / Fawzy Morsy Abo El-abbas
مشرف / Tarek Abd El-Karim Moustafa
تاريخ النشر
2017
عدد الصفحات
152p.:
اللغة
الإنجليزية
الدرجة
ماجستير
التخصص
الزراعية والعلوم البيولوجية (المتنوعة)
تاريخ الإجازة
1/1/2017
مكان الإجازة
جامعة عين شمس - كلية الزراعة - امراض النبات
الفهرس
Only 14 pages are availabe for public view

from 152

from 152

Abstract

During four successive seasons (2013-2016), incidence and spread of Plum pox virus (PPV) on apricot trees were determined in eight governorates. Among 4630 externally examined apricot trees during March and April months, 2710 ones (58.5%) showed typical symptoms of plum pox (Sharka) disease. Double Antibody Sandwich-Enzyme Linked Immuno-Sorbent Assay (DAS-ELISA) ensured that these trees were infected with PPV and proved the efficiency and accuracy of external test by 98%. Visual examination after April is doubtful due to the confusion associated with appearance of powdery mildew symptoms. Natural PPV-infection percentages of apricot trees varied between 16.4% and 87.7% according to the location, tree age, soil type and tested cultivar. The virus was transmitted mechanically (by using some special treatments) and by grafting but not through the infected seeds. Graft transmission gave better results than mechanical transmission. Varietal susceptibility studies revealed that under natural conditions, Amal cultivar was the most susceptible one followed by Canino, Amar and then by Hamawy cultivar. A positive correlation between trees-age and susceptibility to PPV-infection was detected. Infected apricot seedlings showed decrements in total chlorophyll content as compared with healthy ones. In addition, comparing with the control plants (uninoculated), virus infections increased the activity of phenylalanine ammonia-lyase, peroxidase and polyphenol oxidase at all stone fruit samples. On the other side, a total phenol was increased in virus-infected apricot and peach trees as compared with