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Control of tsetse and trypanosomiasis transmission in Uganda by applications of lambda‐cyhalothrin
Author(s) -
OKOTH J. O.,
OKETHI V.,
OGOLA A.
Publication year - 1991
Publication title -
medical and veterinary entomology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.028
H-Index - 82
eISSN - 1365-2915
pISSN - 0269-283X
DOI - 10.1111/j.1365-2915.1991.tb00529.x
Subject(s) - cyhalothrin , african trypanosomiasis , biology , pyrethroid , trypanosomiasis , toxicology , veterinary medicine , trypanosoma brucei , virology , pesticide , ecology , medicine , biochemistry , gene
. The pyrethroid insecticide lambda‐cyhalothrin was evaluated in field trials against Glossina f.fuscipes and sleeping sickness transmission in Iyolwa sub‐county, Tororo District, Uganda. The insecticide was applied selectively to the resting‐sites of tsetse, by bush‐spraying, using 10% wettable powder (10WP) formulation at an application rate of 11.6 g a.i./ha over an area of 28 km 2 , or by a 2% Electrodyn formulation (2ED) applied at 0.9 g a.i./ha over 30 km 2 . In a third trial area of 32 km 2 , 215 pyramidal traps treated with lambda‐cyhalothrin 100 mg/m 2 were set. The best impact was obtained with 10WP lambda‐cyhalothrin which eliminated tsetse within 1–2 months, whereas G.f.fuscipes persisted at very low density in part of the area treated with 2ED lambda‐cyhalothrin. In both treated areas the numbers of human sleeping sickness cases fell to no more than one per month, compared with four to twelve per month previously. The overall rate of cattle trypanosomiasis (T.brucei and T.vivax) was also reduced slightly. Insecticide‐treated traps remained fully effective for at least 6 months under field conditions and catches were reduced 20–90‐fold. These results in the control of tsetse and trypanosomiasis transmission lead us to recommend lambda‐cyhalothrin for tsetse control operations.