Abstract
A field and laboratory study was conducted for soil samples in citrus orchards in the Muqdadiya region - Diyala province in year 2021, for three depths (3, 5, and 7) cm, to detect overwintering peach fruit fly pupae Bactrocera zonata (Saunders) its infecting by Beauveria bassiana (Bals) Vuill. . The results showed that inverse (negative) correlation between the rates of the numbers of fungal colonies and the different soil depths, as the correlation value was (-0.906).
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