📋 Steps
1
September 1-15: Apply perimeter spray for fall invaders
Bifenthrin on all south and west-facing exterior walls before stink bugs, boxelder bugs, Asian lady beetles, and cluster flies begin aggregating. This single action prevents all five major fall invaders simultaneously.
2
September: Seal all exterior gaps top to bottom
Work from roofline down: attic vents (add hardware cloth if needed), fascia-soffit junction, all window and door frames, utility penetrations, and foundation cracks. Use caulk for gaps under 1/4 inch; expanding foam plus hardware cloth for larger gaps.
3
September-October: Inspect foundation for mouse entry
Get low with a flashlight and inspect the full foundation perimeter. Seal any gap a pencil passes through — every utility penetration, sill plate junction, and conduit entry. Install new door sweeps on all exterior doors.
4
October: Set snap traps inside along all interior walls
Before any mouse enters, position snap traps along interior walls in kitchen, basement, and utility areas. Peanut butter bait. Check every 2-3 days through November. Catching mice immediately as they enter prevents population establishment.
5
October: Apply Delta Dust to attic vents
2-3 puffs of Delta Dust into attic vents in October creates a barrier that kills cluster flies seeking hibernation sites before they establish winter aggregations. Prevents the winter emergence nuisance without indoor spray.
6
October: Check crawl space vapor barrier
Inspect crawl space vapor barrier for damage and ensure all joints are sealed. A compromised vapor barrier allows moisture and pest entry. Replace damaged sections before winter.
💡 Tips
- The entire fall protocol takes about 4 hours and costs $100-200 in products — compared to $500-2,000 for reactive treatment of established mouse, stink bug, or cluster fly infestations mid-winter
- Fall exclusion work is permanent — every gap sealed reduces pest entry indefinitely, unlike sprays that require annual reapplication
- October is the single best month for rodent exclusion — field mice are actively seeking winter shelter but population pressure hasn't peaked yet
- Keep a running list of new gaps found during the fall inspection — this creates a permanent map of the structure's vulnerabilities for future reference
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