infestation

The act of infesting or harassing; harassment; molestation.

A harassing inroad; a malignant or mischievous invasion.

The act of infesting or state of being infested; molestation; vexation; annoyance.

The presence of a large number of pest organisms in an area or field, on the surface of a host or anything that might contact a host, or in the soil.

a swarm of insects that attack plants

the state of being invaded or overrun by parasites