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Browsing by Author Abd-El-Kareem, Farid

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  • Local Trichoderma strains as a control strategy of complex black root rot disease of strawberry in Egypt

    • Authors: Abd-El-Kareem, Farid;  Advisor: -;  Participants: Elshahawy, Ibrahim E.; Abd-Elgawad, Mahfouz M. M. (2019)

  • Each of the antagonistic fungal strains significantly reduced growth area of all pathogenic fungi collectively causing the disease. Trichoderma harzianum, T. viride, and T. koningii reduced the growth area more than 90.6% for all tested pathogenic fungi. Each species significantly reduced disease incidence and severity under field conditions. The highest reduction in the disease incidence and severity, 83.3 and 88.5% respectively, was attained by mixture of the four species. This mixture increased the strawberry fresh and dry weight by 83.3 and 176.9%, respectively, and the yield by 117.1%. All Trichoderma species tested significantly increased the activity of two plant defense-relate...
  • BB

  • Native bacteria for field biocontrol of black root rot in Egyptian strawberry

    • Authors: Abd-El-Kareem, Farid;  Advisor: -;  Participants: Elshahawy, Ibrahim E.; Abd-Elgawad, Mahfouz M. M. (2022)

  • Increasing cultivation of strawberry in Egypt has boosted efforts to increase its yield. Biocontrol agents (BCAs) may avoid side effects and health risks caused by chemical fungicides used to control black root rot disease in strawberry. Some BCAs control the disease and augment strawberry yield, but additional research is needed to fit BCAs into emerging control strategies. The impact of six bacterial isolates of Paenibacillus polymyxa and Bacillus brevis on this disease and on berry yield is reported and compared to a common chemical fungicide.
  • BB

  • Resistance against phomopsis leaf blight disease induced by potassium salts in strawberry plants

    • Authors: Abd-El-Kareem, Farid;  Advisor: -;  Participants: Elshahawy, Ibrahim E. (2020)

  • Full inhibition of the fungal linear growth was achieved at the highest concentration (2%) of the two salts. Under field conditions, 87.5, 81.3, and 81.3% were the best decreases in disease severity gained by the two salts at 2% of both salts and the fungicide Amstar, respectively. Potassium bicarbonate at 1.5% reduced severity by 68.8%. Concentrations 1, 1.5, and 2% of each salt considerably enhanced strawberry yield. The increases were 66.7 and 61.7%, at 2% concentration by the two salts, respectively. Increments by 126.7 and 150% of peroxidase activity in plant leaves and by 140 and 148% of chitinase activity were noted by the two salts, respectively, at 2%.