Field studies using repellent-treated wide-mesh net jackets against Glossina morsitans in Ethiopia
Sholdt, L.L.; Grothaus, R.H.; Schreck, C.E.; Gouck, H.K.
East African Medical Journal 52(5): 277-283
1975
ISSN/ISBN: 0012-835X PMID: 1157732 Document Number: 95882
Wide-mesh netting impregnated with space repellents (which affect biting insects at a distance rather than by contact) has proved effective against a wide range of species of Diptera. In this paper, tests are reported of wide-mesh, repellent-impregnated net jackets against bites of Glossina morsitans Westw. under field conditions in western Ethiopia. The hooded jackets were of polyester with cotton threaded through the netting to absorb the repellent. Five men wearing jackets impregnated with different compounds at 0.5 g/g net rode in a Landrover driven slowly for 2 h with stops every few minutes through country infested with G. morsitans. The most effective repellent was A13-20830 (di-isopentyl malate), which provided an average over-all protection of 83% to net-covered areas and hands and face for the 8-day period of the tests (90% of net-covered areas and 59% of face and hands) in comparison with an untreated control jacket. A13-20364 (1-(o-ethoxybenzoyl)piperidine) gave 66% protection, A13-15510 (2-(2-(2-butoxyethoxy)ethoxy)ethyl 3-methylcrotonate) gave 61% and deet 56%. The fifth repellent, 2-((p-methoxybenzyl)oxy)-N,N-dipropylacetamide, was dropped from the tests because it caused burning sensations of bare skin. Compounds A13-20830 and A13-15510 gave complete protection to the hands and face for the first day, and the other two provided 83% protection. Thereafter, protection of these exposed areas was poor. This pattern indicates weak spatial repellency.