[1] Diadegma semiclausum is native to Europe but has spread to, or been introduced to, other parts of the world, including Asia, Egypt, South Africa, Hawaii, Australia and New Zealand.

Its preferred temperature range is between 15 and 25 °C (59 and 77 °F), so in tropical countries it is found in cooler climates at higher altitudes.

The female wasp can lay several hundred eggs over the course of about three weeks if it finds sufficient nectar or other sugary food to sustain it.

The main natural enemy of the diamondback moth in the Philippines is the parasitoid wasp Cotesia vestalis, but overuse of insecticides limits this parasite's effectiveness.

[4] However the use of insecticide has to be moderated otherwise the wasps will not survive, with the bacterium Bacillus thuringiensis being an acceptable alternative.