New York Natural Heritage Program
Rusty-patched Bumble Bee
Bombus (Bombus) affinis Cresson, 1863
Sarina Jepsen
Family: Triepeolus (Apidae)

State Protection: Not Listed
The species is not listed or protected by New York State.

Federal Protection: Not Listed

State Rarity Rank: SH
A State Rarity Rank of SH means: Historically known from New York State, but not seen in the past 15 years.

Global Rarity Rank: G1
A Global Rarity Rank of G1 means: Critically imperiled globally because of extreme rarity (5 or fewer occurrences), or very few remaining acres (or miles of stream), or especially vulnerable to extinction because of some factor of its biology.

Did you know?
Not all rusty-patched bumble bees have a rusty-brown patch of hair on their abdomen. Workers and males have this coloration, but queens do not (Evans et al. 2008). See the Identification Comments for more details.

State Ranking Justification [-]
Rusty-patched bumble bee (Bombus affinis) has been ranked state historical (SH) as the last known record for New York is from 1999 and the species has not persisted in neighboring states, suffering catostrophic decline throughout its range in recent years. While the definitive cause for its decline is unknown, bumble bee experts and scientists strongly suspect exotic pathogens such as Nosema bombi that have been introduced into wild populations (Cameron et al. 2011) and neonicotinoid pesticides (Colla and Taylor-Pindar 2011). 

Short-term Trends [-]

Long-term Trends [-]