He is popularly best known for his introduction of a small wasp as an agent for controlling woolly aphis in apple-trees. In 1925 he was elected a fellow of the Royal Society, London, and in the following year he published his book on The Insects of Australia and New Zealand, a comprehensive work with many illustrations.
He is famous for his introduction of a small wasp as an agent to control woolly aphids in apple trees. In 1925, he was elected a fellow of the Royal Society in London, and the following year, he published a comprehensive work on insects of Australia and New Zealand.