- The adult moths prefer to lay eggs where there is a dense vegetation cover, for example they often occur in the larger numbers where turf has been dug up to make a vegetable or flower bed, large populations tend therefore to be temporary
- Where possible tolerate populations of caterpillars, as butterflies and moths are an important part of the garden ecosystem
- Encourage predators and other natural enemies in the garden such as birds, wasps, hedgehogs and ground beetles. Cultivation of the ground can briefly expose the grubs to predators, such as birds.
- Remove larvae of from soil as they are found
A mixture of nematode species for controlling caterpillars and some other vegetable pests is sold as Fruit and Vegetable Protection and is available from some biological control suppliers. To be effective the nematodes need to be watered into moist soil while soil temperatures are in the range of 12-20ºC (54-68ºF). These temperatures occur between April and September. Nematodes should be applied as soon as possible after purchase, following the suppliers’ instructions. It may be necessary to water the soil before and after application to ensure the soil is sufficiently moist for nematode activity and survival. Repeat application may be necessary.
Biological control suppliers (pdf document)
There are currently no pesticides available to home gardeners or the treatment of soil.