Lesser mouse-eared bat

The lesser mouse-eared bat (Myotis blythii) is a mammal belonging to the order Chiroptera, family Vespertilionidae. In an agronomic context, it is critical to clarify that this species is not a plant pest. Often misidentified or misunderstood in rural areas, these bats are highly beneficial insectivores that perform essential ecological services by preying upon agricultural pests during their nightly foraging flights.

The biology and lifecycle of this species are centered around colonial living and strict dietary specialization on insects. They typically inhabit caves, mines, or large attic spaces during the breeding season. Having a relatively low reproductive rate, with females producing only a single pup per year, they depend on stable, undisturbed roosting sites. Their peak activity coincides with the growing season, which aligns with the high-activity period of various crop-damaging moths and beetles.

Regarding their impact on crops, these bats provide natural pest suppression. They are highly efficient hunters, consuming thousands of insects each night. Their diet primarily consists of nocturnal Lepidoptera and Coleoptera, which are known to cause significant damage to cereals, fruit orchards, and vegetable crops. By naturally limiting these populations, they serve as biological agents of control.

There is zero evidence that Myotis blythii damages plants, fruits, or roots. They are strictly insectivorous and have no mechanisms to feed on plant tissue. Therefore, they pose no threat to agricultural productivity. Instead, their presence in agricultural landscapes serves as a marker of a functional, biodiverse ecosystem where integrated pest management (IPM) can thrive without excessive chemical interventions.

Conservation strategies are vital for maintaining these natural pest controllers. Farmers are encouraged to avoid the use of broad-spectrum systemic insecticides, which can lead to biomagnification and secondary poisoning of the bats. Furthermore, protecting maternity roosts and maintaining natural corridors near farms are recommended practices to support the health and activity of the lesser mouse-eared bat population.