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Sublethal insecticide effects on the probing responsiveness of tsetse flies and blowflies
Author(s) -
CHADD ELIZABETH M.,
BRADY JOHN
Publication year - 1982
Publication title -
physiological entomology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.693
H-Index - 57
eISSN - 1365-3032
pISSN - 0307-6962
DOI - 10.1111/j.1365-3032.1982.tb00281.x
Subject(s) - biology , permethrin , endosulfan , diazinon , toxicology , zoology , physiology , pesticide , ecology
. Tethered Glossina austeni Newst. males and females were tested for daily and starvation‐related changes in their probing responsiveness to a warmed sponge surface presented to their tarsi. The change in responsiveness of the two sexes was indistinguishable, both following a marked V‐shape pattern across the photophase of LD 12:12 and an increase from a mean of c. 5% responding on day 3 after a blood‐meal to over 60% doing so on day 6. Sublethal doses ( c. LD 15 ) of endosulfan had no detectable effect on this pattern, but of DDT caused a temporary doubling of responsiveness, and of permethrin caused a marked and long‐lasting reduction in responsiveness. Tethered Protophormia terraenovae (R.‐D.) tested similarly for changes in threshold to tarsal stimulation with sucrose solutions (assessed by whether or not they extended the proboscis), showed a marked threshold decrease following LD 15 diazinon treatment and, like the tsetse, no effect of LD 15 endosulfan treatment, though unlike tsetse they showed no increase in threshold following permethrin treatment. The results are discussed in relation to what is known of the mode of action of these four insecticides, and in relation to circadian rhythm physiology in insects.