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Articles by G. Nouri-Ganbalani
Total Records ( 3 ) for G. Nouri-Ganbalani
  S.A.A. Fathi and G. Nouri-Ganbalani
  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.
  S.A.A. Fathi , G. Nouri-Ganbalani and H. Rafiee-Dastjerdi
  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.
  A. Nouri-Ganbalani , G. Nouri-Ganbalani and D. Hassanpanah
  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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