Incidence and Genetic Variability of Erysiphe Cichoracearum, the Causal Agent of Powdery Mildew on Squash and Cucumber in Tubas and Jenin
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AbstractAn experiment was carried out in 2008 to study the incidence of Erysiphe cichoracearum, the causal agent of powdery mildew on squash and cucumber in different growing seasons of the Tobas and Jenin districts. The incidence was studied in both open fields and plastic houses. Also, the research studied the genetic variability between the fungal isolates using RAPD. The maximum fungal incidence was recorded on squash, compared with cucumber in all growing seasons. The maximum disease incidence of 70% was recorded on squash during both spring and summer growing seasons in Tobas district. Autumn was considered the second most serious growing season of both crops as the fungal incidence ranged from 4 to 53% and 3 to 42% on squash and cucumber, respectively. In late winter growing season, the fungal incidence was much lower on both crops planted in Tobas district compared with the other growing seasons (4 to 20% on squash and 2 to 18% on cucumber) . In addition, studying the genetic variability between the fungal isolates showed that these isolates were genetically different between Tobas and Jenin districts. Furthermore, polymorphism was in squash and cucumber from obtained isolates the between observed Tobas district while no polymorphism was recorded in Jenin district.
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دراسة مدى االنتشار واالختالفات الوراثية لمسبب مرض البياض الدقيقي على محصولي الخيار والكوسا في طوباس وجنين
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