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Articles by S. Kabbabeh
Total Records ( 3 ) for S. Kabbabeh
  C. Akem , S. Kabbabeh and S. Ahmed
  Field trials were conducted at 3 Mediterranean environments in Syria, during the cropping seasons of 1997 and 1998, to evaluate the control of chickpea Ascochyta blight with a single fungicide spray on 4 chickpea genotypes. Ascochyta blight disease epidemics were produced at the different locations and plots with the spread of Ascochyta-infected chickpea debris soon after crop germination. The plots were sprayed with a single application of the fungicide, Chlorothalonil at 4 different growth stages, starting from seedling stage to podding growth stage, to determine the effect of the fungicide application timing on Ascochyta blight severity, chickpea grain yield and grain quality. Generally, single applications made before flowering significantly (p<0.05) reduced disease severity in the 2 susceptible genotypes, Ghab1 and Ghab 3. Plot yields of these genotypes were also significantly greater than the untreated controls when applications were made at seedling or vegetative growth stages. There was no significant difference in disease severity and grain yield, between the untreated control and time of application on the resistant genotypes, F 90-96 and F 85-88. The timing of application had a significant effect on pod infection but generally no effect on seed weight. There were no significant effects of seed infection by Ascochyta rabiei. The results suggest that single fungicide sprays made before flowering are most effective in Ascochyta blight control under Mediterranean conditions and can also result in higher grain yields than applications made at the reproductive phase of the crop.
  C. Akem , S. Kabbabeh and S. Ahmed
  The influence of different row spacings on the development of Ascochyta blight and on the grain yield of chickpea (Cicer arietinum) was evaluated during the 1997 and 1998 cropping seasons. Two chickpea cutivars (Ghab 1 and Ghab 3) and 2 breeding lines (FLIP 90-96 and F 88-85) were used in the field trials at 3 locations, representing the different agroecological zones in which winter chickpea is grown in Syria and in most of the Mediterranean countries. Four row spacings, (15, 30, 45 and 60 cm), were evaluated in all the trials at the different locations. All plots were initially inoculated with infected chickpea debris and disease development followed natural prevailing environmental conditions. Ascochyta blight disease severity ratings were taken at early flowering and again at podding and grain yield for each plot was measured at harvest. There was a significant (p<0.05) decrease in disease severity as the row spacings were increased, in most of the entries at all the locations, for both years. There was a corresponding significant increase in grain yields with less disease at wider row spacings. The increase in grain yield was due to the added factor of increased plant branching at wider row spacings, than from less disease alone. This was noted in the more resistant entry (F90-96) which showed no significant change in disease severity with increased row spacings but still had a significant yield increase at wider row spacings at all the 3 locations. It would appear from this study that under Syrian and Mediterranean conditions, an increase in grain yield is expected when chickpea is planted at wider row spacings during winter. This increase is due both to lower Ascochyta blight severity and increased plant branching.
  C. Akem , S. Kabbabeh and S. Ahmed
  The influence of chickpea (Cicer arietinum) planting date on seasonal epidemics of Ascochyta blight caused by Ascochyta rabiei (Pass.) Labrousse and on grain yield was evaluated during the 1997 and 1998 cropping seasons. Two chickpea cultivar (Ghab 1 and Ghab 3) and 2 breeding lines (FLIP 90-96 and F 88-85) were used in the field trials at 3 different locations representing the different agro ecological zones in which winter chickpea is grown in Syria and in most of the Mediterranean countries. Four field plantings were made at 14-day intervals from mid November to mid March. All plots were initially inoculated with infected debris and disease development followed natural prevailing environmental conditions. Ascochyta blight disease severity ratings were taken at early flowering and again at podding and grain yield for each plot was measured at harvest. There was a significant (p<0.05) increase in disease severity between the first and third planting in all the entries at all the locations and for both years. The difference in disease severity resulted in significant yield differences but not in differences in seed quality. Under Syrian and Mediterranean conditions, an increase in Ascochyta blight severity can be expected with early planting of chickpea before January and this can result in a corresponding big loss in crop yield. The loss in yield from disease through early plantings however, is more than compensated for, by the reduction in yield due to other environmental parameters in late spring planting, if moderate resistant cultivars are planted.
 
 
 
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