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Register a new userStudy of Persistence Residues of Dimethoate and Deltamethrin Grape in Hamah in Syria
دراسة استمرارية بقايا مبيدي الدايمثوات و الدلتامثرين على ثمار العنب في سورية مدينة حماة
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أجريت هذه الدراسة في محافظة حماة عام ١٩٩٨ لتحديد استمرارية بقايا كل من مبيدي الدايمثوات و الدلتامثرين على ثمار العنب، و حساب فترة الأمان لهما ضمن الظروف البيئية المحلية للقطر العربي السوري.
Study was conducted at Hama on summer ١٩٩٨ to determine the Persistence of two pesticides, the Organophosphorus Dimethoate, and the Pyrethroid Deltamethrin, on the Grapes.
References used
Awasthi M. D. ١٩٨٥. Persistence pattern and safety evaluation of synthetic pyrethroids on eggplant. Indian Journal of Agriculture Science
Awashi M. D. ١٩٨٦. Persistence Pattern and safety evaluation of Synthetic Pyrethroids on grapes. Indian Journal of Agricultural Science
Awasthi M.D. ١٩٨٩. Persistence of synthetic pyrethroid residues on mango fruits. Acta-Horticultural
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This study investigated the Persistence of Deltamethrin on Apple,
Grape, Tomato and Cucumber. as follows:The grape and apple trees
were sprayed with Deltamethrin at rate 250 Cm3/ha, while
Cucumber and tomato were sprayed with Deltamethrin at rate
150
cm3/ha.
The half-life of Deltamethrin was 5.36, 5.78, 2.32, 2.11
days on grape, apple, tomato and cucumber respectively. The
calculated safety periods of Deltamethrin were 7, 4, 0, 3 days for
grape, apple, cucumber and tomato respectively. Although the
pesticide container label, states that crops can be consumed
immediately after spraying.
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.,
The cucumber plants grown in field were sprayed with methomyl at dose
(60-g a.i./100 liter water).The objectives of this work were to study role of
somehome Preparation (washing and peeling) in elimination of methomyl
residues from contaminated cu
cumber fruits. The washing processes caused
removal of residues methomyl from contaminated cucumber fruits that
collected at intervals: 1,3 days after one application by percent loss reached:
72,60 %, respectively.
The percent loss reached: 37.7, 45.8 % in cucumber fruits that collected at
intervals: 0, 2 days, respectively after two applications. The peeling processes
caused removal of residues methomyl from cucumber fruits that collected at
intervals: 0, 3 days after one application by percent loss reached: 58.75, 57.14
%, respectively. and in cucumber fruits that collected at intervals : 0, 2 and 3
days after two applications ,the percent loss was: 55, 62.7 and 34.6 %,
respectively.
This study was carried out on soil samples collected from Damascus
country side (Alghota – Jesrin), in order to study the impact of organochlorine
insecticides resulted from heavy use for a long time.
The duration of experiment was ١١ monthes cove
ring four season
condition. Samples were taken from two levels, the surface (١٠ cm) and the
deep levels (٣٠-٤٥ cm). Soil samples were extracted by acetone, hexane and
chloroform solvents. Residues were detected by using GC.
This study was conducted to examine the effect of storage period and fruit
wrapped of two local grapes varieties (Balady and Helwany) using polyethylene
bags of 50 μm thickness on some losses of grapes berry . the study estimated the
weight loss p
ercent, berry shatter, berry spoilage and the total losses for the
varieties as a function to storage period and packing of grapes berry. Results
showed that there is a high correlation between the storage period and the
weight loss, berry shatter, spoilage and the total losses of fruits, where this
action started after 3 weeks of the beginning of storage. The average percents of
weight loss after 100 days storage were 11.75 % and 8.43% for Balady and
Helwany respectively, the berry shatter percents were 6.20% and 5.52%
respectively for Balady and Helwany, the spoilage percents were 9.50% and
7.20% for Balady and Helwany respectively and the total losses for tow
varieties were 20.1% and 13.63% for Balady and Helwany respectively. The
previous values decreased clearly by using bags of polyethylene of 50 μm
thickness as follows: 9.47% and % 6.82 for weight losses, 3.10 % and 1.8% for
berry shatter, 7.20% and 3.51% for spoilage and the total losses 16% and
10.1% for Balady and Helwany respectively.
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