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Beyond the Bale : June 2019
AWI’s Sheep Blowfly Resistance Management Strategy Working Group, who contributed to the development of this eight-step strategy are: Brian Horton (University of Tasmania), Peter James (University of Queensland), Deborah Maxwell (ParaBoss), Jane Morrison (MSD Animal Health), Bridget Peachey (AWI), Nick Rolls (Elanco) and Narelle Sales (NSW Department of Primary Industries). MORE INFORMATION www.flyboss.com.au ARE SHORTER PROTECTION PERIODS ALWAYS BECAUSE OF RESISTANCE? In cases where flystrikes are occurring earlier than expected based on the protection period on the product label, you should first rule out other causes of reduced protection: • The individual sheep did not receive a treatment. • Treatment was applied, but incorrectly. • Wool length was too short at application time. • Soiled or lumpy wool. • Seasonal rainfall has been excessive and washed some chemical out of the treated area. monitoring of sheep is not possible for a short period because of other farm tasks or holidays. – The Flyboss Fly and Lice Products Tool can help you select a chemical group that will provide the length of protection that is required. 4. MINIMISE THE NUMBER OF INSECTICIDE TREATMENTS APPLIED IN A SEASON • Optimise the timing of treatment to provide full protection during high risk periods. • Utilise other management strategies, such as shearing and crutching, to minimise the length of time flies may be exposed to inadequate levels of insecticides on the sheep. However, ensure that you abide by wool harvesting intervals so that there are no unacceptable chemical residues in the wool. 5. CONSIDER TREATMENTS FOR OTHER PARASITES, PARTICULARLY LICE TREATMENTS • Exposure to insecticides used for treatment of other parasites (particularly lice) can contribute to resistance selection in blowflies, and vice versa. • Where possible, use a different chemical group to treat flies and lice. • Aim to eradicate lice and avoid the need for lice treatments. ON FARM 41 PREMIUM YARDS CALL NOW TO BE ELIGIBLE $30,000 INSTANT 6. APPLY INSECTICIDES CAREFULLY AND STRICTLY AS SPECIFIED ON THE LABEL • Shorter protection periods are often due to poor application, not resistance. Be sure to apply insecticides carefully according to the label instructions. • Poor application can expose flies to sub-lethal levels of insecticides; this can contribute to an increase in resistance. 7. MONITOR FOR FLYSTRIKE FREQUENTLY • Check every 2–3 days during high risk periods to identify struck sheep early. • Treat sheep and kill maggots before they become larger and are harder to kill. • Record when strike occurs in relation to preventive treatments. • Notify the product manufacturer if you suspect resistance. 8. COLLECT AND KILL ALL MAGGOTS FROM FLY STRUCK SHEEP • Place maggots and shorn wool into a sealed plastic bag and leave in the sun so the maggots are killed. • If maggots are not collected or destroyed the most resistant ones can burrow into the soil, complete development and contribute to the next generation of flies.