This study was carried out to determine the efficiency of local Bacillus isolates to
control large wax moth larvae (Galleria mellonella L.) at GCSAR laboratory in 2012.
Infected larvae were collected from stored wax combs, and the bacteria Bacillus
genus were isolated from dead larvae, or that showing disease symptoms of black
brown spots on larvae cuticle. Bacterium was grown on T3 medium and identified
according to biochemical tests, and the efficacy of isolates was determined on pure
colonies of larvae. The results of biochemical tests showed that the isolates belong
to Bacillus thuringiensis. Isolates were different in pathogenicity. Bt5 isolate was
the most efficient to kill the larvae of large wax moth (72.4 %), and significantly
superior all other isolates (p ≤ 0.01). Bt1 isolate showed a significant difference
with control but non-significant difference with Bt2, Bt3, Bt4, Bt6 and Bt7 isolates.
In this study, the virulence of six isolates of nematode
Heterodera schachtii Shmidt which had isolated from fields in
Syrian Governorates (Homs, Hamah, Idlib, Aleppo, Der-Azzoor and
Arraqqa), was compared on sugar beet in a greenhouse pot
experi
ment. Final populations of the nematode were calculated, RF
(Reproduction factor) of the nematode were calculated for every
isolate.
Biological tests were study the pathogenicity of four
local isolates of Beauveria bassiana (Bals) orginated
from, Latakia , Homs ,ICARDA Jableh on third larval age of Bactrocera oleae.
The pathogenicity of three isolates of the fungus Beauveria
bassiana (Bals.) Vuill were evaluated on potato tuber moth
Phthorimaea operculella (Zeller) (Lep.,Gelechiidae).
WI٢٢٩١ and Tadmor, two barley lines widely grown in the Mediterranean
region were tested for powdery mildew (Erysiphe graminis f. sp. hordei)
resistance together with the European differential tester set against six powdery
mildew isolates. The si
x cultures of powdery mildew developed from single
colonies were comprised of four powdery mildew isolates originating from Syrian barley lines and two cultures originating from Danish barley lines.
