Livestock Management Insect Pests Sept. 2003, LM-10.8 Black Dump Fly Michael W. DuPonte1 and Linda Burnham Larish2 1CTAHR Department of Human Nutrition, Food and Animal Sciences, 2Hawaii Department of Health Hydrotaea aenescens Wiedemann Origin First collected by Grimshaw on Lanai, December 1893, now found on all the major Hawaiian islands. Public health concern Can be a nuisance to the public in large numbers. Hosts Larva feeds primarily on chicken and swine manure, dead animals, and rotting meat. Poultry concern Larvae of the black dump fly are considered to be ben­ eficial because they prey on house fly larvae. Description 3 3 Medium size, glossy black fly ⁄16– ⁄8 inches long. Adults prefer dark locations and stay close to the ground. Life cycle Growth stages: egg, larva, pupa, adult. From egg to adult takes approximately 14 days. Females lay about 170 eggs over a 7–10 day period. Control Poultry operations need to keep good manure manage­ References ment records if using the black dump fly as a biologi­ Hardy, D. Elmo. 1960. Insects of Hawaii, v. 14 Diptera: Cyclorrapha cal control for house flies. IV. Univ. Hawaii Press, Honolulu. pp. 54–56. Hogsette, J. A., and R. D. Jacobs. The black dump fly: a larval preda­ When manure is removed, keep a residue of old, dry tor of house flies. Univ. Florida Cooperative Extension. Photo manure to help absorb fresh droppings and preserve above downloaded May, 2003 from <http://edis.ifas.ufl.edu/ fly predators. BODY_PS021>. Surface-spray with an insecticide when adult flies are overabundant. Consult your pesticide supplier for recommended prod­ ucts, and always follow label directions. Published by the College of Tropical Agriculture and Human Resources (CTAHR) and issued in furtherance of Cooperative Extension work, Acts of May 8 and June 30, 1914, in cooperation with the U.S. Department of Agriculture. Andrew G. Hashimoto, Director/Dean, Cooperative Extension Service/CTAHR, University of Hawaii at Manoa, Honolulu, Hawaii 96822. An Equal Opportunity / Affirmative Action Institution providing programs and services to the people of Hawaii without regard to race, sex, age, religion, color, national origin, ancestry, disability, marital status, arrest and court record, sexual orientation, or veteran status. CTAHR publications can be found on the Web site <http://www.ctahr.hawaii.edu> or ordered by calling 808-956-7046 or sending e-mail to [email protected]. .