If you google ant+aphid there is a lot of info about problems. Here is one:
Some ants actually care for and "farm" other insects! Aphids, scale insects and mealybugs suck the sap of plants. These insects can't use all the sugar that they get from the plants, so they excrete "honeydew", which the ants collect to feed the colony. Ants will transport aphids from plant to plant and take the eggs into their colony for the winter. Ants will also defend aphids from insect predators, such as lady beetles and lacewings, by attacking them in large numbers.
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Michael
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