Controlled release insecticide devices for protection of sheep against head strike caused by Lucilia cuprina

James, P. J., Mitchell, H. K., Cockrum, K. S. and Ancell, P. M. C. (1994) Controlled release insecticide devices for protection of sheep against head strike caused by Lucilia cuprina. Veterinary Parasitology, 52 1-2: 113-128.


Author James, P. J.
Mitchell, H. K.
Cockrum, K. S.
Ancell, P. M. C.
Title Controlled release insecticide devices for protection of sheep against head strike caused by Lucilia cuprina
Formatted title Controlled release insecticide devices for protection of sheep against head strike caused by Lucilia cuprina
Journal name Veterinary Parasitology
Publication date 1994-03
Sub-type Article
DOI 10.1016/0304-4017(94)90041-8
Volume number 52
Issue number 1-2
ISSN 0304-4017; 1873-2550
Start page 113
End page 128
Total pages 16
Place of publication Amsterdam, Netherlands
Publisher Elsevier
Language eng
Formatted abstract The effectiveness of polymer matrix tags containing (w/w) 8.5% cypermethrin, 7.5% flucythrinate, 13.7% tetrachlorvinphos or 20.0% diazinon in protecting sheep against head strike by the sheep blowfly (Lucilia cuprina Wiedemann) was investigated in larval implant, fly cage and field studies.
Tags impregnated with cypermethrin reduced the total number of egg masses deposited on the heads of sheep in fly cage studies over a 6 week period by 73.3% compared with no treatment. Tags impregnated with flucythrinate reduced the number of egg masses by 25.3% over 21 weeks but there were no significant differences (P < 0.05) between treated and untreated sheep at individual exposures. Egg masses were found on the majority of tagged sheep and no protection was provided against implants with first instar L. cuprina larvae by either cypermethrin or flucythrinate tags.
Tags impregnated with diazinon gave longer protection than treatment with a liquid formulation containing 400 ppm diazinon in larval implant, fly cage and field studies. Over a 12 week period in field studies, 6.6% of rams treated with diazinon tags became struck compared with 30% treated by diazinon jetting 35.7% treated with plastic tags not impregnated with insecticide and 24.2% of untreated rams. When the rams were exposed to high populations of L. cuprina in an exposure house from 13 to 18 weeks after treatment, 3.3% of rams treated with diazinon tags, 57.1% treated by diazinon jetting, 43.8% treated with plastic tags and 23.5% of untreated rams became struck. Most strikes in the diazinon tagged sheep occurred at sites which were not contacted by the tags. Tags impregnated with tetrachlorvinphos reduced the number of strikes in comparison with no treatment in larval implant and fly cage studies but the results were inconsistent and not as good as those from diazinon tags.
It is concluded that well designed controlled release devices that reliably contact the wool on the heads of sheep at sites of flystrike risk and which are able to withstand damage from rams fighting may be able to give prolonged protection against head strike.
Keyword Lucilia cuprina
Sheep-Arthropoda
Controlled release technology
Head strike
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article
Collection: Queensland Alliance for Agriculture and Food Innovation
 
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