الفهرس 
Material and MethodsOnly 14 pages are availabe for public view
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Abstract
Table grape (Vitis vinifera L.) is a wildly spread fruit crop
which occupied the second most important fruit crop following
citrus fruits. It is cultivated mainly for exportation, table use, fresh
juice and raisin. Recently, grapes are widely cultivated in the newly
reclaimed lands. Grapes are easily propagated by cuttings directly
which could be grown through a wide range of soil or grafting the
cuttings on rootstocks according to their resistance to some biotic
and abiotic factors. Grapevine dieback is one of the most important
diseases all over the world which attacked twigs of grapevine and
cause great losses in the field. Lasiodiplodia theobromae (syn.
Botrydiplodia theobromae, Diplodia natalensis) is the pycnidial
state of Botryosphaeria rhodina, a pathogen that causes cankers and
dieback in many woody and herbaceous species.
The obtained results could be summarized as follows:
1- characteristic symptoms of Lasiodiplodia dieback were
observed in vineyards throughout all surveyed locations. The
disease was present in all surveyed vineyards but disease
incidence and severity significantly varied with location.
Disease incidence and severity showed slight significantly
differences between two seasons. Means of both parameters
were low in the second season than first one.
2- Testing the grapevine cultivars revealed that cv. Thompson
seedless was the most susceptible one to dieback disease where
it recorded the highest percentage of disease severity followed
by Crimson while, Flame seedless recorded the lowest
percentage.
3- The highest percentage in disease severity was recorded in
Beheira governorate with all tested cultivars, while, the lowest.