EPIDEMIOLOGY AND CONTROL OF FIRE BLIGHT
DISEASE IN PEARS
[68]
Abd-El-Khair1, H. and H.I. Seif El-Nasr1
ABSTRACT
The fire blight
disease has caused severe losses to pear orchards since it occurred in Egypt in
1982. A loss ranged from 75-85% and 95-97% from developed blossoms was
recorded during
2000 season
in Monofia
and Behera
governorates, respectively.
Streptomycin sulphate
and Cuprozan separately or
in a mixture were used in controlling E. amylovora in vitro test.
Streptomycin sulphate was effective against fire blight pathogen
at used concentrations, while
Cuprozan gave a weak effect especially
at high concentrations. Strepto-Cuprozan
mixture gave
an excellent
antagonistic effect against E. amylovora comparing with streptomycin or
Cuprozan, separately. In field experiments, good control was achieved using
pruning and treated with strepto-copper sulphate mixture. The amount of copper
is increased inside the E. amylovora
cells when treated with
strepto-Cuprozan mixture.
Also, hypersensitivity reaction could be
used for
quick detection of bactericide effectiveness.