Document Type

Thesis - Open Access

Award Date


Degree Name

Master of Science (MS)

Department / School



Three organophosphate insecticides, viz. Ravap® (a 1:4 mixture of dichlorvos and Gardona® (2-chloro-1-(2,4,5-trichlorophenyl) vinyl dimethyl phosphate, Rabon® (2-chloro-1-(2,4,5-trichlorophenyl) vinyl dimethyl phosphate), and 95.0% malathion, were applied aerially at ULV rates for control of face flies, Musca autumnalis De Geer, and horn flies, Haematobia irrit.ns (L.), during the summers of 1971 and 1972. From pre- and post- spray counts of adult flies on cows it was determined that Ravap reduced horn flies and face flies 69.6% and 26.1% respectively, one day after application. One week after application, however, horn flies had increased 217.4% over prespray counts, and face flies had increased 60.8%. The first application of Rabon reduced horn flies on cows by 96.2% one day post spray, and 9.4% one-week post spray, while face flies were reduced 90.9% the day after, and increased 127.3% after one week. The second application of Rabon reduced face flies 76.0% the day after application, and 32.0% after one week, and reduced horn flies 95.7% and 48.1% one day and one-week post spray, respectively. Malathion reduced horn flies 83.0% the day after application, and 14.0% the week after, and reduced face flies 29.4%, and 17.6% one day and one-week post spray, respectively. Out of 21 species and 2 species-groups or the dung fauna, only 2 species of dung beetles, Platystethus americanus Erichson and Aphodius f'imetarius (L.), as well as certain larval Diptera, were significantly reduced by Rabon. Neither Ravap nor malathion affected dung biota significantly.

Library of Congress Subject Headings

Face fly
Horn fly
Insect pests -- Control



Number of Pages



South Dakota State University