Three systemic fungicides fenarimol, triflumizol, and triadimenol were used (mixed with mineral oil at 300 ml/100 L water or not) to evaluate the effects on powdery mildew of tomato in greenhouse. Results showed important role of mineral oil in inhan
cing the studied fungicides's effects by decreasing infection percentage and severity of the disease if the recommended doses are used or half of them. when these fungicides were used in low rates (50% of the recommended doses without mineral oil) infection percentage after a mounth of treating were 65.2 - 75.7% and severity 62.7 – 77.3% wherease when the fungicides were used with oil the infection percentage were decreased to 44.5 - 48.6% and severity to 16.9 – 45.8%
To evaluate the effects of summer mineral oil which were mixed with tow systemic commercial fungicides Flint and Trifmine on some tomato yield properties in Syrian coast greenhouse conditions, the tow fungicides were supplied at the recommended doses
(mixed with mineral oil or not), the results showed no negative effctes on the plant flowers, fruits, fruit's weight through the study; there were 71.0-75.0 fruits on each plant and fruit's weight was 75.3-87.2 g/one fruit in treatments which fungicides were not mixed with mineral oil, 69.1-76.4 fruits on each plant, 74.8-81.2 g/one fruit in treatments which fungicides were mixed, compairing with 62.2 fruits/plant in control, 87.6 g/fruit in control, differences were not significant.
The experiment was carried out at Jableh region during 2012-2013 in two green
houses to study the effects of using the bumble bees and organic carbon to improve flower
set and yield of tomato hybrid Dalloula . The experiment included three treatmen
ts :
natural pollination (control) ,flowers pollination by organic carbon, and flowers pollination
by bumble bees . The first and second treatments were applied in the first green house , and
the third treatment was applied in the second green house . Results showed that the bumble
bees treatment produced significantly the highest percentage of flower set and yield than
the other treatments . Flower set of tomato over 10 clusters was 89.8% , 83.7% , 39.2% for
bumble bees treatment, organic carbon treatment, and control , respectively. The highest
yield (22 kg/m2)was obtained from bumble bees treatment . Flowers pollinated by bumble
bees gave fruits that looked better in shape , size and color ,and with higher weights . In
the bumble bee pollinated flowers , the quality of fruits was superior for vitamin C , sugar
and acidity .
A salt stress was applied from 3rd leaf stage until the maturation on three tomato
cultivars (Marmara, Levovil and Picolino). The salt stress was achieved by increasing the
solution EC from 3 (control) to 6.7 dS/m for, Na and Na+Ca treatments, resp
ectively. The
stress induced a significant increase in vitamin C of Marmara and Levovil fruit content
(20.94 and 23.03 mg/100g) as compared to the control (16.62 and 19.43 mg/100g,
respectively). The titratable acidity was increased significantly (17%) only in Marmara and
Picolino. The fruit content of fructose was increased in Levovil and Picolino by 1.4 and 1.7
folds, respectively, as compared to control (11.13 and 18.8g/kg, respectively). While the
content of N in Levovil and Picolino was decreased, under stress, by 33 and 58% as
compared to the control (0.12 and 0.19%), respectively, the P content was increased. The
salt stress decreased the K content in Levovil and Picolino to reach to 0.22 and 0.26% as
compared to control (0.27 and 0.29%), respectively. The calcium addition modified the
stress impact. A significant increase, was registered in Ca content under stress in Marmara
andPicolino as compared to control, while the calcium addition did have any effect on.
The effect mycorhizal fungi on tomato wilt disease caused by Fusarium oxysporum
was studied. The results showed that % of disease incidence reduced in treatment whit
mycorrhizal fungi . % of disease incidence reached to 33% when plants infected wit
h
mycorrhizae and Fusarium wilt compared to plants infected with Fusarium wilt just
where% of disease incidence reached to 70% .The results showed a sighificant increased in
plant height ,leaf number , fresh and dry matter of shoot and root in treated plants with
mycorrhiza and Fusarium wilt compared whit treated plants with Fusarium wilt.The
increase in plant height reached 24.13% ,16.93% in leaf number,36.13% in wet weight of
shoot ,48.14 in wet weight of root,30.37% in dry weight of shoot and 29.18% in dry
weight of root in treated plants with mycorrhiza and Fusarium wilt.
In this research, 66 samples of tomatoes were collected from vegetables
central market in Darr´aa city during the period extended between 20
October/2009 - 4 October/2010) to investigate the presence of 26 pesticide
residues which belong to differ
ent chemical classes using Gas Chromatography
instruments equipped with μECD, FPD, MSD detectors. QuEChERS extraction
method was used for residue extraction from tomato samples. The detectors
linearity and pesticide detection limits were determined for every pesticide
studied, and the recovery for all pesticides ranged from 90.6 for fenvalerate to
105.5% for propargite. Results showed that 56.1% of tomato samples contained
detectable residues and Chlorpyrifos and cypermethrin were the most detected
pesticides, while amounts of propargite, methamidofos, cypermethrin,
chlorpyrifos were the largest detected and mounted to 0.99, 0.15, 0.015, 0.012
mg/kg respectively as a median values. Residues of methamidofos in only 2
samples were above the European MRLs.,
This search was carried out in Abi Garash farm, Faculty of Agriculture,
Damascus University to study the efficiency of using “Agerton” as a fertiliser;
either by irrigation or a foliar spry on tomato seedling. Four varieties were
used (Astona, Tyr
ad, E26 and Local).
Results showed that the treatment by the fertilizer resulted in an increase in
growth thorough the plant length increasing. This increase was about 1.1 and
1.2 folds for all varieties and types of treatment (irrigation and foliar spry), as
compared to the control.
Moreover, the using of fertilizer led to a significant increase in the yield of
plant, which increased by 1.2 and 1.5 in Astona; 1.2 and 1.4 in E26, 2.2 and 2.3
in Local and 1.5 and 2 in Tyrade, for the treatment of irrigation and foliar spry,
respectively.
Despite being one of the reasons of production decline, salinity is still a tool
to improve production quality in some hybrids. this research was conducted at
the Faculty of Agriculture, University of Damascus during 2012 season. A salt
stress was
applied on two tomato hybrids, Bonaparte and Marmara by
increasing the value of the electrical conductivity of irrigating water from 4 to
13 ds / m, at the stage of the third true leaf to the end of growth of the two
tomato plants.
Results indicated that salt stress led to a reduction in the fruit weight of
both hybrids but it helped in improving some chemical and physical
characteristics relating to fruit quality, such as increasing the fruit content of
soluble solids in both hybrids. Salt stress did not affect the lycopene content of
fruits in Bonapart, but it was increased by 2 folds inMarmara. Some fruit color
indices (a* and b*) were greater in Bonaparte while L* indice was higher in
Marmara. However, the color indices of fruits were not affected by salinity in
both hybrids studied.
This study was conducted in a green house at the Faculty of Agriculture
Sana'a University, during 2000-2001 and 2002 growing season. The objective
of the study was to obtain a genetic information on total soluble solids in the
tomato fruits in ord
er to estimate the gene action effects, which control
inheritance, heterosis, degree of dominance and heritability in term of broad
sense and narrow sense, as will as, reduction inbreeding depression in F2, for
understanding the suitable method for genetic improvement of quality.
Two tomato cultivars were used for genetic screening and cross breeding for
F1 hybrid production. F1 was cross bred with the parents for getting back cross
P1 and P2. Also, F2 was obtained. The results revealed, the heterosis in F1 based
on average of mid parents was 7.94% as compared with average of higher
parents (-2.21%). The degree of dominance was less than 1.0, which indicate
partial dominance, additive gene action variance was higher than the non
additive gene action variance which reflected on the narrow sense heritability
(h2 n.s), that reached 81.37%. The reduction in inbreeding depression in F2
reached 15.82%. The overall results indicated that, selection and hybridization
methods seem to be a good method for improving quality of total soluble solids
in tomato.
The research aims to study the effect of certain organic and amino
compounds in the growth and production of tomato under green
houses conditions.Hulay F1 hybrid tomato and two organic
commercial vehicles differing in composition Hupost and
Boldo
uzerwere used.The experiment done in a way randomized
complete blocks designed , with three replicates per treatment , and
10 plants per replicate . Seedlings WERE Prepared in beet moss
using trays of Alstrepor inside the greenhouses.
