"Like all spiders, black-and-yellow argiopes are carnivorous. They spin an orb web to capture small flying insects such as aphids, flies, grasshoppers, and Hymenoptera (wasps and bees). A female can take prey up to 47mm in diameter, up to 200% of her own size (Nyffeler et al. 1987)."
Source for text information is The University of Michigan Museum of Zoology, Animal Diversity Web