© Benaki Phytopathological Institute
Karajeh
38
er for the yeast treatment than that of the
control followed by H
2
O
2
and the nemati-
cide treatments (Figure 1C). There was no
significant variation in chlorophyll content
of leaves due to the treatments (Figure 2 A).
The highest significant level of total pheno-
lics in roots of the tomato cv. Asala plants
treated with H
2
O
2
followed by plants treated
with the yeast, which caused significant but
lower increase than H
2
O
2
. There was no vari-
ation between oxamyl treated plants and
non-treated control plants in their phenol
content (Figure 2B).
With respect to root-galling reduction,
the yeast treatment was similar to oxamyl
followed by the H
2
O
2
treatment (Figure 3A).
Both yeast and oxamyl treatments signifi-
cantly reduced
M. javanica
final populations
in the rhizospheric soil as compared to the
untreated controls. Oxamyl was significantly
better than the yeast in decreasing the nem-
atode population. However, H
2
O
2
treatment
did not significantly affect the final popula-
tions under field conditions (Figure 3B).
Figure 2.
Effects of different treatments [HP: hydrogen peroxide, VD: Vydate (oxamyl), YS: yeast (
Saccharomyces cerevisiae
)]
on (A) leaf chlorophyll content and (B) root total phenol content in tomato.
