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Articles by Wafaa M. Haggag
Total Records ( 2 ) for Wafaa M. Haggag
  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 decrease 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 (P< 0.01) 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 , Faten M. Abd-El- Latif and Riad S.R. El- Mohamedy
  Physical and biochemical integrated management using soil solarization and chitin or chitosan singly or in combination for controlling tomato wilt disease under field conditions was studied. Chitin had no inhibitory effect on the growth of pathogenic fungus. On the other hand, chitosan at 6 g L–1 completely inhibit the linear growth and spore germination of F. oxysporum f. sp. lycopersici. Under field conditions, results indicated that maximum soil temperatures in solarized were recorded 55.2, 50.8 and 46.3°C at depths of 1-10, 11-20 and 21-30 cm of soil surface. Solarization was more effective in reducing the pathogen population. The highest reduction in total count of F. oxysporum f. sp. lycopersici was observed in mulched soil at 1-10 and 11-20 cm depths. Soil solarization and chitin at 6.0 g kg–1 soil, chitosan at 6.0 g kg–1 soil or topsin at 3.0 g kg–1 soil singly or in combination for controlling tomato, wilt disease under field conditions was evaluated. Results revealed that all treatments significantly reduced the disease incidence and severity during two growing seasons. The highest reduction in disease incidence and severity were obtained with combined treatments between soil solarization and chitin, chitosan or topsin which recorded 3.2-5.0% as disease incidence and 0.2-0.3% as disease severity during two growing seasons. As for tomato yield the highest increase in tomato yield was obtained with combined treatments between soil solarization and chitin, chitosan or topsin which increased the tomato yield more than 66.7, 68.9 and 66.7% during two growing seasons. All treatments significantly increased the chitinase activity of tomato plants. The most effective treatments were combined treatments between soil solarization and chitin or chitosan which increased the chitinase activity by 100.0 and 116.7%. It could be suggested that combined treatments between soil solarization and chitin or chitosan as safety materials might be used commercially for controlling tomato wilt diseases under field conditions.
 
 
 
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