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Improved persistence of insecticide deposits on targets for controlling Glossina pallidipes (Diptera: Glossinidae)

  • S.J. Torr (a1), M.T.P. Holloway (a1) and G.A. Vale (a2)
  • DOI:
  • Published online: 01 July 2009

Deposits of deltamethrin suspension concentrate (s.c.) on Terylene net and cotton cloth were bioassayed in Zimbabwe by exposing them to fed, female Glossina pallidipes Austen, using a 45 s contact with cloth and a brief collision with net. On textured yarn net, the effective life of deposits produced from immersion in 0.1% deltamethrin was longer than on flat yarn net, apparently because the textured net held more insecticide and the insecticide was lost more slowly. The addition of an absorber for ultra-violet light (0.1% 2-hydroxy-4-methoxybenzophenone-5-sulphonic acid) did not significantly extend the effective life of deltamethrin deposits on cloth or net. Applying deltamethrin s.c. as a 0.6% suspension to cotton cloth produced mortalities of <90% for 300 days. Applications of 0.8% deltamethrin on cotton cloth and textured net produced mortalities of <70% for 12–16 months and 9 months, respectively, compared to 4–10 months and 5–7 months, respectively for applications of 0.1% deltamethrin. Chemical analyses indicated that the longer effective life of the 0.6–0.8% was due to a higher initial amount of insecticide and a lower rate of loss. It is suggested that for controlling tsetse in southern Africa, all-cloth targets sprayed with 0.6% deltamethrin s.c. will have an effective life of ca. one year.

Corresponding author
Dr. S. Torr, Tsetse Control Branch, PO Box 8283, Causeway, Harare, Zimbabwe.
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M. Hussain H. Perschke and R. Kutscher (1990) The effect of selected UV absorber compounds on the photodegradation of pyrethroid insecticides applied to cotton fabric screens. Pesticide Science 28, 345355.

G.A. Vale (1974) New field methods for studying the response of tsetse flies (Diptera: Glossinidae) to hosts. Bulletin of Entomological Research 64, 199208.

G.A. Vale , D.F. Lovemore , S. Flint and G.F. Cockbill (1988) Odour baited targets to control tsetse flies, Glossina spp. (Diptera: Glossinidae), in Zimbabwe. Bulletin of Entomological Research 78, 3149.

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Bulletin of Entomological Research
  • ISSN: 0007-4853
  • EISSN: 1475-2670
  • URL: /core/journals/bulletin-of-entomological-research
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