WormBoss worm control program

Victorian winter rainfall

The life cycle of sheep roundworms

Image: The roundworm life cycle (Source: Sheep CRC)

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The availability of infective larvae of the winter scour worms on pasture, showing a peak around June–August (depending upon the timing of the autumn break)

Source: The epidemiology and control of gastrointestinal parasites of sheep in Australia. Edited by A.D. Donald, W.H Southcott and J.K. Dineen, Division of Animal Health, CSIRO 1978.