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Register a new userتقصي انتشار الفطر Phytophthora infestans المسبب لمرض اللفحة المتأخرة على البطاطا في سوريا ودراسة التنوع الفيزيولوجي والجزيئي للمسبب
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Damascus University رسالة ماجستير
Publication date
2015
fields
Agricultural Engineering
and research's language is
العربية
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Shamra Editor
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تقصي انتشار الفطر Phytophthora infestans المسبب لمرض اللفحة المتأخرة على البطاطا في سوريا ودراسة التنوع الفيزيولوجي والجزيئي للمسبب
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References used
حسن أحمد عبد المنعم (1989) البطاطا جامعة القاهرة - الدار العربية للنشر والتوزيع
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This search carried out to study the effect of treatment with some fungicides
(mancozeb + metalaxyl - M, chlorothalonil ،azoxystrobin and mancozeb) in
control late blight (Phytophthora infestans Mont.) on potato va. Spunta and
yield in homs during
two seasons 2008 and 2009. The results showed that the
use of a mixture of fungicides (mancozeb + metalaxyl - M) gave the superior
efficacy in controlling the disease during two seasons compared with other
treatments. The percentage of effect (74.32% and 57.24%) during 2008 and
2009, respectively. While, the fungicides (mancozeb) gave the lowest effect in
controlling the disease during two seasons, where as the percentage of effect
(31.95% and 40%), respectively. Recorded results showed that spray of potato
plant with tested fungicides increase the yield compared with untreated plants.
The mixture fungicides (mancozeb + metalaxyl-M) increase in yield (35.55%
and 32.285) during 2008 and 2009, at respectively. We can arrange the tested
fungicides according to their the efficacy in controlling the disease and in
increase the yield such as following: mancozeb +metalaxyl-M> chlorothalonil>
azoxystrobin> mancozeb.
Ascochyta blight, which is caused by the fungus Ascochyta fabae f. Sp. Lentis, is
considered as a very important fungal disease that infects lentils and cause it damage.
The experiment was conducted in ICARDA research station for agricultural exper
iments in
the orchard area Basha, Jableh, Lattakia in four varieties of lentils that are grown in
different parts of Syria, and these varieties are: Idleb 2, Idleb 3, Idleb 4, and municipal red.
Artificial infection was performed using a local isolation of the fungus Ascochyta lentis
with an average of three times and ten days between each infection and the other. The
infectious vaccine adopted a concentration of 105 Båge / ml.
To study the effect of some fungicides invitro on an isolate of the fungus Cladosporium fulvum(cook) that causes leaf mold on tomatoes, five fungicides were tested Flint - Topsin-M- Score and Collisand Indofil-M at concentrations between 1 - 4000 p
pm. The results showed that Score and Indofil-M were the most effective fungicides inhibiting hyphal growth for the isolate even at 10ppm. Also, they inhibited completely the spores germinatios at the 100 ppm. The effects of fungicides Flint and Collis were weak on hyphal growth of the isolate and inhibited almost completely the spores germinatios at 1000 ppm. We didn,t observe clear inhibiting effects of Topsin-M on hyphal on the growth of the spores germinatios at 1000 ppm .
A survey was conducted to determine the frequency and mean densities of
plant-parasitic nematodes associated with cotton crop (Gossypium hirsutum L.)
after the harvesting season 2008 in Syria. Results showed that twelve genera of
plant-parasitic n
ematodes were found associated with cotton crop roots. The
distribution of nematode genera varied between the Syrian governorates,
Pratylenchus spp., Meloidogyne spp. and Rotylenchulus infect most cotton fields
in all syrian governorates. The distribution was relatively uniform between the
governorates. They occurred in 80.7%, 46.6% and 32.95%, respectively, of
tested fields with an average density of 137.2, 59.6 and 574.3 juveniles/100 cm3
soil, respectively. meanwhile, the genus Tylenchorhynchus was found in central
region only. Rotylenchulus was more prevalent in the heavier soils, but
Meloidogyne. was not influenced by soil type. The other nematode genera
detected in this survey were less frequent, their frequency of occurrence were
for Hoplolaimus (19.3%), Scutellonema (31.8%), Tylenchorhynchus (31.8%),
Helicotylenchus (30.7%), Rotylenchus (36.4%), Tylenchus (18.2%), Xiphinema
(3.4%).
The research was conducted to study an efficacy of the fungus
Trichoderma harzianumin controlling the gray mold disease on
tomato that causing by the fungus Botrytis cinerea. A local isolate
of the fungus T. harzianum was studied under laboratory conditions
using two methods: antagonism and the spore suspension.
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