Preventive effect of some bio preparations, natural compounds and chemical salt against powdery mildew of strawberries [electronic resource].

Includes reference.

Two different beneficial microorganisms namely Bacillus subtilis and Trichoderma harzianum, two commercial natural compounds namely soft guard and Chitocare (Chitosan) were used as foliar spray to study their effects on strawberry powdery mildew disease, compared with Calciven (calcium chloride) preparation at deferent rates (concentrations). Disease incidence, percentage of disease severity were determined under greenhouse conditions and field conditions, in addition to weight of crop and the shelf life period of the harvested fruits were determined under field conditions. Treatments were implemented in greenhouse and field under natural infestation condition for two successive seasons 2007 - 2008 and 2008 - 2009. Data of greenhouse show that treatments using Bacillus subtilis or soft guard or chitocare led to the best disease control and give 69.2% and 61.5% reduction of disease incidence, respectively, followed by Trichoderma harzianum and Calcivin gave 53.80% reduction of disease incidence. Data also show that positive correlation between concentration of different preparations and plant protection were noticed. Results obtained from field experiments were in harmony with those obtained from greenhouse regarding plant protection. Under field conditions, all treatments led to increase in weight of the crop compared with control treatment. All treatments led to increase of shelf life of fruits to 7 days compared with 3 days in control treatment.

Summary in Arabic.

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