Use 15 ml of pupae per square metre as standard. Modify this quantity in relation to the number of flowers per square metre.
Protect the pupae from direct sunlight and moisture such as rain or condensation. Use coffee cups with lids, for instance, or bags. Do not scatter the pupae loose.
Do not release Natupol Fly without preparation if the temperature is below 15 ˚C. The outcome will be unpredictable and will often take longer than a week. In the event of having to use Natupol Fly at a temperature below 15 ˚C, first mature them in a warm environment. Release Natupol Fly once the first fully-grown flies have emerged.