Vespertilionidae

These bats primarily affect crops that provide resting sites or food sources, specifically fruits like grapes and stone fruits. Damage occurs during their nocturnal foraging and roosting activities. While not feeding directly on plant tissue as a primary source of nutrients, their physical interaction with the plants often leads to irreparable damage to delicate fruit skins and young shoots.

The biology and lifecycle of Vespertilionidae are centered around nocturnal activity and colonial nesting. They typically breed in spring and summer, occupying spaces such as farm structures, lofts, or dense tree foliage. During the peak growing season, their colonies can reach significant sizes, leading to concentrated waste deposition and increased risk to the nearby vegetation.

The harmful impact is largely observed through the contamination of crops with guano, which introduces pathogens and induces phytotoxicity, leading to fruit rot. Furthermore, mechanical damage caused by bats navigating within the fruit canopy results in significant losses in harvest quality and marketability, as damaged fruit becomes susceptible to secondary fungal infections.

Protection measures must be non-lethal and focus on deterrence and exclusion. Recommended strategies include the installation of ultrasonic repellents, which disrupt the echolocation ability of the bats without harming them. Physical exclusion through netting and sealing entry points to farm buildings is essential for prevention. Maintaining clean field boundaries and minimizing night-time lighting can also help reduce the attractiveness of agricultural sites to these mammals.