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In the latter part of the summer some patches of fragrant white water lilies and yellow pond lilies become infested with water lily aphids. Depending on conditions, large numbers of wasps and to a lesser extent bees, feed on these. The bees are likely feeding on the honeydew produced by the aphids, and the wasps feeding on the aphids themselves. The wasps might be picking off aphids to bring back to the nest and feed to their larvae, although some of the wasps appear to be licking off the honeydew as well.