Historical clue formulations

• Termites and drills — 2019-01-15
• Tunneling machines — 2018-06-23
• Orchard menaces — 2014-07-05
• Wood-damaging insects — 2013-02-27
• Insects found in trunks — 2008-03-09
• Bugs that live in trees — 2006-05-14
• Damaging insects — 2003-02-15
• Shipworms, e.g. — 2002-03-08