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Articles by Wafaa M. Haggag
Total Records ( 3 ) for Wafaa M. Haggag
  Wafaa M. Haggag
  Downy mildew in cucumber plants, caused by Pseudoperonospora cubensis, was reduced by foliar spraying of antitranspirants film Kaolin nu-film, bio-film, folicote and Polyacrylamide Anti-Stress 550. In greenhouse test, antitranpirants proved to be effective treatments in reducing disease incidence, severity and pathogen sporulation when applied prior or post to inoculation. Among these compounds, Kaolin and Nu-Film (1.0 %) were more effective in reducing spores counts, germination and infection as well as downy infected area and lesions number. Scanning electron microscope examination showed that, Kaolin antitranspirant inhibited zoospores germination, growth and development as well as had become collapsed and lost its turgidity when applied either pre or post inoculation. Although, spraying of Bio-Film and Polyacrylamide Anti-Stress 550 antitranspirants, at 1 and 3%, resulted also in better disease control. Under protected cultivation and natural infection conditions, all antitranspirants showed a remarkable effectiveness on the reduction of disease severity and pathogen density when applied twice at 45 and 75 days after sowing in cucumber leaves. Furthermore, all tested antitranspirants, significantly increased the cucumber plant height and yield. Kaolin strongly protected cucumber against downy mildew and yield increased. Conclusively, antitranspirants film can be used as effective treatments for the control of downy mildew disease in cucumber plants under plastic houses.
  Wafaa M. Haggag and A.W. Amin
  The effect of Trichoderma species in control of root- rot fungus, Fusarium solani, root-knot nematode, Meloidogyne javanica or reniform nematode, Rotylenchulus reniformis disease complex and on growth of sunflower plant was studied under greenhouse conditions. Treating two weeks old sunflower seedlings cv. Giza 1 with Trichoderma harzianum, T. viride, T. koningii, T. reesei or T. hamatum gave highly significant effect in control of fusarium-rot disease incidence and nematodes infection on sunflower roots. Infection of F. solani was highly increased in M. javanica infested soil than R. reniformis. Treatments of Trichoderma species led to decreasing Fusarium cfu counts in soil, infested with either M. javanica or R. reniformis and also significantly improved the plant growth parameters. T. hamatum, T. harzianum and T. koningii gave the greatest reduction in disease incidence caused by Fusarium, M. javanica or R. reniformis infestation. Generally, there was highly significant reduction in the number of fusarium-wilt disease and nematode population and increases in plant growth parameter of sunflower when treated with Trichoderma species.
  Wafaa M. Haggag and Nadia G. El-Gamal
  The efficacy of Tilletiopsis pallescens, formulated with natural oils on the inhibition of cucumber powdery mildew in greenhouses was investigated. Two foliar sprays of cotton, maize, sunflower or paraffin oil formulations (0.05 %) of T. pallescens were sprayed on cucumber plants, 30 and 75 days after planting. The oils formulated with T. pallescens improved the biocontrol potential. The most effective treatments were cotton, paraffin and maize oil formulations which enhanced the T. pallescens survival and the plant protection against the powdery mildew disease incidence. Where, the disease colonies, disease severity and infected leaf areas as well as Sphaerotheca fuliginea sporulation were greatly suppressed. Furthermore, cotton oil formulation of Tilletiopsis isolate exhibited high quantities of chitinase , β-1,3- glucanase, cellulase and protease isozyme bands of cucumber leaves surface after 10 extended to 40 days of application. On the contrast, unamended oil treatments showed moderate isozyme bands activity after 10 days of application and then began to decline after 40 days of application. Whereas no β-1,3- glucanase or cellulase were detected. At the same time, yield of cucumber plants treated with oil formulations of T. pallescens was significantly higher.
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