Bonus Pest Chance

Bonus Pest Chance

Bonus Pest Chance (or BPC) is a stat that affects the chance to spawn additional pests whenever one would spawn on your Garden while actively farming. It does not affect offline spawns or Pest/Mouse/Vermin Traps.

Pest Spawning Formula

$\text{Average Pest Spawns}=1+\frac{\text{BPC}}{100}$

$\text{Guaranteed Pest Spawns}=1+\lfloor \frac{\text{BPC}}{100}\rfloor$

$P(\text{Additional Pest Spawn})=\frac{\text{BPC}}{100}mod1$

Just like how Farming Fortune works, every 100 Bonus Pest Chance guarantees an additional pest. Any additional BPC gives a percentage chance for one more pest to spawn.
For example: 250 BPC = 3 pests + 50% chance of an additional pest.

Bonus Pest Chance Sources

Image	Item	Bonus Pest Chance	Notes
Helianthus Armor Helianthus Armor	Armor	+134
Pest Vest	Equipment	+31.5
Mosquito Pet	Pet	+92
Pesthunter Relic Pesthunter Relic	Pesthunter Relic	+80	Can also be used to disable the BPC stat entirely.
Wriggling Larva	Wriggling Larva	+10	Each Larva gives +2 BPC, you can consume up to 5. This BPC is permanent.
Yellow Potion	Douce Pluie de Stinky Cheese Potion	+20	Lasts for 1 h (can be increased by Alchemy level, Legendary Parrot Pet, and Potion Affinity Talisman/Ring/Artifact)
Sprayonator	Sprayonator	+50	Lasts for 30 min, only gives BPC when farming on a sprayed plot.
Vermin Vaporizer Chip Vermin Vaporizer Chip	Vermin Vaporizer Chip	+100	Grants +3/+4/+5 BPC per chip level depending on its rarity, up to 20 chips.
	Total	517.5	6 pests + 17.5% chance for 7

NOTE: This is not in any particular order (e.g. price or which is most efficient to get first), it is simply a list of sources.

Armor BPC Breakdown

Image	Item	Bonus Pest Chance	Notes
Helianthus Armor Helianthus Armor	Helianthus Armor	+80	An upgrade to Fermento Armor
Enchanted Book	Pesterminator	+24	A Beginner's Guide to Pesthunting is required to get Pesterminator 6
Mantid Claw Mantid Claw	Mantid Claw	+30	+2.5 BPC per piece on Mythic rarity, and up to +5 additional BPC per piece depending on pest kills within the last 10 minutes

Equipment BPC Breakdown

Image	Item	Bonus Pest Chance	Notes
Pesthunter's Necklace	Pesthunter's Necklace + Squeaky	+6.5	Also decreases pest spawn cooldown by 10% + 2.5%
Pest Vest	Pest Vest + Squeaky	+12	Also decreases pest spawn cooldown by 15% + 2.5%
Pesthunter's Belt	Pesthunter's Belt + Squeaky	+6.5	Also decreases pest spawn cooldown by 10% + 2.5%
Pesthunter's Gloves	Pesthunter's Gloves + Squeaky	+6.5	Also decreases pest spawn cooldown by 10% + 2.5%

Pet BPC Breakdown

Image	Item	Bonus Pest Chance	Notes
Slug Pet	Slug	+40
Mosquito Pet	Mosquito	+50
Brown Bandana	Brown Bandana	+42	Gives +0.2 BPC pest bestiary level

Decreasing Pest Spawn Time

Decreasing Cooldown

The base cooldown is 5 min.

• Pesthunter's Necklace (-10%)
• Pest Vest (-15%)
• Pesthunter's Belt (-10%)
• Pesthunter's Gloves (-10%)
• Squeaky Reforge (-2.5% each, -10% total)
• Finnegan's Pest Eradicator perk (-20%)

This results in a total reduction of 55% (making the cooldown 2 min 15 s) outside Finnegan, or 75% (making it 1 min 15 s) during Finnegan.

Increasing Spawn Chance

• Sprayonator - 1/500 (avg. 25 s at 20 BPS -> 1/250 (avg. 12.5 s at 20 BPS)
• Atmospheric Filter (during Autumn) - 1/250 (avg. 12.5 s at 20 BPS) -> 1/212.5 (avg. 10.625 s at 20 BPS)