Pine Brooming (Witch's Broom): Fusiform Rust's Strange Growth

A dense, bushy cluster of needles at a pine branch tip—called a witch's broom or pine brooming—is caused by fusiform rust, a common fungal disease on loblolly pines.

How It Forms

The fungus typically creates swollen galls on stems. When it invades a growing tip, it triggers a hormonal explosion: the tip produces vigorous, short shoots in all directions, each covered in needles. The result is a conspicuously dense, green "broom."

Long-Term Outlook

Brooms can persist for decades. One neighbor's broom survived 22 years, its heavy photosynthesis actually strengthening the supporting limb. Eventually, accumulated needle weight plus a storm caused the branch to fall.

Interesting Fact

The dwarf loblolly pine cultivar 'Nana' originated from a propagated witch's broom.

Management

No treatment needed unless the broom becomes a hazard. Prune it out if it threatens to break; otherwise, enjoy this quirky natural sculpture.