الفهرس 
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Abstract
Data presented in Table (4.24) and (Figures 4.91, 4.94, 4.95, 4.96) indicated that there
were highly significant differences among treatments and soft rot bacterial isolates in potato Cara
cultivar.
The best percentage, of disease severity, were 0.83 %, 0.93% in potato tubers infected by
Pectobacterium carotovorum as treated with essential oils from Syzygium cumini and Conyza
dioscoridis, respectively, then 1.80% in potato tubers inoculated with Dickeya chrysanthemi and
treated by S. cumini essential oil followed by 1.96% as potato tubers infected by Enterobacter
cloacae as treated with S. cumini and 2.33% as potato tubers inoculated by D. chrysanthemi and
treated with C. dioscoridis essential oil.
While the worst treatment were 4.46 % and 4.96 % as potato tubers infected by E. cloaca that
was previously treated with methanol extracts from C. dioscoridis and Erythrina humeana,
respectively, followed by potato tubers infected by P. carotovorum and treated with E. humeana
methanol extract (5.16%), compared generally with the healthy tubers (Negative control) and
control with Index.
On the other hand, The percentage of disease severity of soft rot bacterial isolates in potato
Spunta cultivar is shown in (Table 4.25) and (Figures. 4.92, 4.97, 4.98, 4.99) with high
significant differences among treatments and soft rot bacterial isolates.
The best treatment (10.93%) was observed in potato Spunta tubers infected by D.
chrysanthemi and treated with S. cumini essential oil followed by potato tubers treated by P.
carotovorum with S. cumini essential oil (14.33%), then 11.49% and 12.0% as potato Spunta
tubers infected with E. cloaca and treated with essential oils for S. cumini and C. dioscoridis,
respectively.
While the worst treatment was in the potato tubers injected by D. chrysanthemi and treated
with E. humeana methanol extract (23.33%) then 24.0% as potato tubers injected by E. cloaca
and treated with E. humeana methanol extract followed by 27.60% and 29.70%, in potato tubers
infected by P. carotovorum and treated with methanol extracts from C. dioscoridis and E.
humeana, respectively. compared with the healthy tubers (Negative control) and control with
Index.
In the case of potato Lady Rosetta cultivar plants inoculated, the percentage of disease
severity of soft rot bacterial isolates were presented in (Table 4.26) and (Figures. 4.93, 4.100,
4.101, 4.102) with high significant differences among treatments and soft rot bacterial isolates.
The treatments were 4.80%, 6.50% and 7.0%, D. chrysanthemi and treated with essential
oils from S. cumini, C. dioscoridis and in potato tubers infected by E. cloaca and treated with S.
cumini essential oil, respectively, followed by potato tubers infected by E. cloaca and treated
with C. dioscoridis essential oil (9.0%). On the other hand, the highest percentage of 15.83% and
16.31% were found when using E. humeana methanol extract with Lady Rosetta potato infected
with P. carotovorum and E. cloaca, respectively, compared generally with the healthy tubers
(Negative control) and control with Index.