Dogwoods And Ants - Knowledgebase Question

Regina, SK
Question by mazzy11
September 10, 1999
The leaves on my two dogwoods are curled with holes in them. I opened up a curled leaf recently and discovered several ants racing about. Could they be affecting the health of the leaves? I live in zone 3 Canada; the dogwoods are in a shady area facing west. It's only the upper leaves that are curling, nothing underneath. Any ideas? Should I spray ant killer on them?


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Answer from NGA
September 10, 1999

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What an interesting observation. Ants often 'herd' aphids, protecting them from predators and milking them for the sticky 'honeydew' they excrete. I suspect that the leaves are curling because aphids are sucking the juices from the leaves. The ants you found were probably gathering the honeydew left by the aphids. I wouldn't spray anything at this point; the dogwood leaves will be shed in just a few weeks. Rake the leaves up and remove them from the garden to remove the potential of overwintering aphid eggs.

Holes in the leaves are usually associated with the feeding of caterpillars or beetles. If you found none of these insects on the leaves, there's no point in spraying to eradicate them.

Ants in themselves are considered beneficial in the garden and are usually just left alone.

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