Historical clue formulations

• Tunnel-making machine — 2026-01-02
• Termite, e.g. — 2024-11-30
• Hole maker — 2018-12-12
• Burrowing insect — 2016-03-13
• Uninvited cornfield guest — 2010-06-18
• Drill — 2009-04-23
• Hole-making tool — 2009-01-29
• Termite, e.g. — 2004-03-13
• Orchardist's woe — 2001-03-03
• Drill — 1998-11-01
• Hole-making bug — 1998-03-22
• Auger or drill — 1996-12-10