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Efficacy of zeta‐cypermethrin as pour‐on or spray formulations for the control of buffalo fly (Haematobia irritans exigua) in cattle
Author(s) -
ROTHWELL JT,
HACKET KC,
FRIEND M.,
FARNSWORTH WR,
LOWE LB
Publication year - 1998
Publication title -
australian veterinary journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.382
H-Index - 59
eISSN - 1751-0813
pISSN - 0005-0423
DOI - 10.1111/j.1751-0813.1998.tb10240.x
Subject(s) - cypermethrin , haematobia irritans , deltamethrin , exigua , muscidae , pyrethroid , biology , veterinary medicine , toxicology , zoology , stomoxys , pesticide , agronomy , spodoptera , medicine , botany , biochemistry , gene , recombinant dna
Objective To determine the efficacy of zeta‐cypermethrin in controlling buffalo fly ( Haematobia irritans exigua ). Design Five field trials in northern and central Queensland. Procedure Zeta‐cypermethrin pour‐on at 2.5 mg/kg, spray at 62.5 ppm, deltamethrin pour‐on and pour‐on vehicle were applied to groups of 20 cattle. Buffalo fly counts were conducted three times before treatment and 3, 7, 14, 21, 28 and 35 days after treatment. Results In central Queensland where synthetic pyrethroid resistance in buffalo fly populations was rare, 2.5 mg/kg of zeta‐cypermethrin pour‐on gave good control of buffalo fly for 4 weeks and was better than a deltamethrin product. A zeta‐cypermethrin spray used at 62.5 ppm gave 14 days control. In far‐north Queensland where resistance to synthetic pyrethroids and heavy rain was common, the maximum period of efficacy of zeta‐cypermethrin pour‐on was reduced to 2 weeks. Conclusion In areas where there is low resistance to synthetic pyrethroids among buffalo flies, zeta‐cypermethrin pour‐on can be expected to give good control for 4 weeks.