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Journal of Biological Sciences
Year: 2012  |  Volume: 12  |  Issue: 7  |  Page No.: 416 - 420

Effect of Soil Acidity on Diseases Caused by Pythium ultimum and Fusarium oxysporum on Tomato Plants

Khalaf M. Alhussaen    

Abstract: Pythium ultimum and Fusarium oxysporum are important pathogens in agriculture crops and cause serious diseases that resulted in reducing the yield of many crops. The effect of soil acidity on the occurrence and severity of diseases caused by Pythium ultimum and Fusarium oxysporum were examined. Pathogens were grew at pH levels of 2-10 in vitro. Pythium ultimum and Fusarium oxysporum isolates have an optimum growth pH level of 6 and 7 and grew well at pH level of 5 and slightly at pH level of 4 and 8 but no growth at pH levels of 2, 3, 9 and 10. Six treatments (4, 5, 6, 7, 8 and 9) were tested in vivo to examine the effect of soil pH on the occurrence and severity of disease. The pH level of 5 was the best for plant growth but not to both pathogens. However, more disease severity by the two pathogens were found at the pH levels of 6 and 7. The pH levels could be used to reduce the plant disease reduction by knowing the optimum levels for plants and pathogens.

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