Achyra affinitalisAchyra affinitalis, the cotton web spinner, is a moth of the family Crambidae. It was described by Julius Lederer in 1863 and is found in Australia and New Zealand.DescriptionThe wingspan is about 20 mm.Host plantsThe larvae feed on Helianthus annuus, Medicago sativa, Linum usatissimum, Gossypium hirsutum, Sorghum bicolor and Atriplex species.