New rusty patched bumble bee's reproductive method makes it such as for example vulnerable to the negative effects of short population proportions
Therefore, using the better available scientific and industrial guidance, we have been checklist this new rusty patched bumble-bee because the a put at risk kinds prior to areas 3(6) and you may 4(a)(1) of your Act

Pesticide play with, for instance the accessibility of several pesticides which have known dangerous and you will sublethal outcomes so you're able to bumble bees, is occurring at increasing account rangewide (Basis Age). Also, herbicide have fun with happens rangewide and certainly will lose available floral information (Foundation A good). On the other hand, the fresh rusty patched bumble-bee is not able to obviously recolonize unoccupied elements that are not linked because of the compatible dispersal environment (Facts An excellent and you can Age).
The newest kinds can experience good diploid male vortex, where amount of nonviable men grows once the wealth declines, and thus further reducing inhabitants size (Basis E).