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| Articles
by
G. Nouri-Ganbalani |
Total Records (
3 ) for
G. Nouri-Ganbalani |
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S.A.A. Fathi
and
G. Nouri-Ganbalani
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The two-spotted spider mite (TSSM), Tetranychus urticae
Koch and onion thrips (OT), Thrips tabaci Lindeman, are two serious
pests of potato and Orius niger (Wolff) and O. minutus (Linnaeus)
are major predators of these pests in the potato fields in Ardabil region.
Therefore, we compared the predation potential and fecundity of these
predator when they fed on 2nd instar larvae of thrips and female mites
on potato leaves in the no-choice and choice experiments in a growth chamber
that was set at 24 ± 1 °C, 50 ± 5% RH and 16: 8 h (L:D)
photoperiod. In the no-choice tests, O. niger showed lower nymphal
mortality percentage, higher fecundity and higher killing rate (km)
when fed on 2nd instar larvae of thrips than female mites. O. minutus
showed lower nymphal mortality percentage, higher fecundity and higher
killing rate (km) on female mites than 2nd instar larvae of
thrips. In the choice tests, the number of 2nd instar larvae of thrips
consumed by different nymphal instars and the adult pairs of O. niger
were significantly higher than the number of female mites consumed.
Different nymphal instars and the adult pairs of O. minutus consumed
significantly more female mites compare to 2nd instar larvae of thrips.
Based on these results it can be concluded that O. niger and O.
minutus are effective natural enemies of OT and TSSM in the potato
fields, respectively. |
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S.A.A. Fathi
,
G. Nouri-Ganbalani
and
H. Rafiee-Dastjerdi
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Empoasca decipiens Paoli (Hom.: Cicadellidae)
has been causing damage in potato fields of Ardabil region in Iran. There
has been an increasing interest in controlling of E. decipiens
using resistant cultivars. The resistance of four commonly planted cultivars
including Diamant, Agria, Casmos and Omidbakhsh to E. decipiens
was compared using some life cycle parameters of this pest in greenhouse
at 24±1°C, 50±5% RH and 16:8 h (L:D) photoperiod. Incubation
period, development timeof1st, 2ndand 3rd instar larvae were not significantly
different on the cultivars studied. Fourth and 5th instar larvae development
time and female and male life span of E. decipiens decreased among
the cultivars in the order of Diamant >Casmos >Omidbakhsh >Agria.
The percentage of larval survival of E. decipiens on Diamant and
Casmos were significantly lower than on Omidbakhsh and Agria. Sex ratio
of E. decipiens on four cultivars was not significantly different.
High correlation coefficients were observed between the density of simple
and glandular trichomes with the percentage of larval survival, larval
development time, female and male life span of E. decipiens. These
results indicated that among the cultivars that were investigated, Diamant
and Casmos were resistant and Omidbakhsh was tolerant to E. decipiens
damage. The results of this study also confirmed that the density of glandular
trichomes may have more affects on the life cycle of E. decipiens
than the density of simple trichomes by restricting larvae and adult feeding.
These results are useful in an integrated management program of E.
decipiens in potato fields. |
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A. Nouri-Ganbalani
,
G. Nouri-Ganbalani
and
D. Hassanpanah
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In this study yield and yield component, Harvest Index
(HI), Stress Tolerance Index (STI), Stress Susceptibility Index (SSI),
Tolerance Index (Tol), Mean Productivity (MP) and Geometric Mean Productivity
(GMP) of 13 advanced winter and intermediate cold hardy wheat genotypes
with two advanced genotypes of Shahreeyar and C-79-16 as checks were investigated
under normal irrigation and after anthesis drought stress condition in
a randomized complete block design experiment with three replications
in Ardabil, Iran in 2006-2007. The effect of drought stress on harvest
index was significant (p≤0.01). The lowest harvest index (38.14%) was
observed in genotype KRC66/SERI//KINACI97 and the highest harvest index
(45.66%) was observed in genotype FDL4/KAUZ. Genotypes KARL//…/3/F1502W9.01,
Appolo/Mhdv and SG-U7067 produced more grain yield under normal irrigation
condition compared to checks and mean stress susceptibility indices of
genotypes SG-U7067, 885K4.1//MNG/SDV1/3/1D13.1/MLT and GKRABA were lower
than checks. On the other hand, under the drought stress condition genotypes
SG-U7067, GKRABA and 885K4.1//…/1D13.1/MLT yielded higher than checks
and their mean stress susceptibility indices were lower than checks. Genotype
SG-U7067 produced the highest yield under both normal irrigation and drought
stress conditions. The yield reduction of this genotype was lowest under
the drought stress conditions. Genotypes SG-U7067 with mean grain yield
of 5.020 t ha-1 under drought stress, lowest SSI of 0.82 and
highest STI of 0.62 was selected as the best drought stress tolerant genotype
among the 15 genotypes that were evaluated. |
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