organic infestation definition
Wiktionary (0.00 / 0 votes) Rate this definition: infestation (Noun). 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.iktionary (0.00 / 0 votes) Rate this definition: infestation (Noun). 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.