Abstract: The present invention relates to a biological control composition comprising at least arthropod biological control agents and astigmatid mite eggs. The invention also relates to the use of astigmatid mite eggs as a nutrient source for arthropod biological control agents. The invention also relates to a biological control composition comprising at least one population of arthropod biological control agents, a nutrient source comprising astigmatid mite eggs, and optionally, a support and/or dissemination substrate. Finally, the present invention further relates to a method for rearing arthropods from astigmatid mite eggs as a nutrient source.