A method of biological control of pest organisms in a agricultural, horticultural or forestry crop by application of beneficial organisms comprises the steps of: generating a supply of beneficial organisms; Generating a supply of carrier substrate particles which have a relief-like, executed with trough-like depressions surface structure; Generating a spreading formulation by applying beneficial organisms to the surface of the carrier substrate particles in their trough-like depressions; Application of the application formulation in a agricultural, horticultural or forestry plant stock.
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