A tiny North American wasp – Aphelinus mali – is a natural enemy of woolly apple aphids, and was introduced to New Zealand in 1921 to help control the pest. Female wasps lay a single egg into aphid nymphs. The nymph dies and the wasp develops into an adult inside the dead body over 20–50 days.
Using this item
This item has been provided for private study purposes (such as school projects, family and local history research) and any published reproduction (print or electronic) may infringe copyright law. It is the responsibility of the user of any material to obtain clearance from the copyright holder.