Effects of several insect growth regulators on egg hatch and subsequent development in the cabbage maggot Delia radicum (L.) (Diptera: Anthomyiidae)

Eggs of Delia radicum 24-28 h old were treated with the same doses of 4 insect growth regulators. Diflubenzuron significantly reduced egg hatch as compared with untreated and solvent-treated controls. Methoprene had a delayed effect, preventing hatching of adults from pupae that subsequently developed from treated eggs. A commercial formulation of diflubenzuron (Dimilin) significantly suppressed and delayed the hatch of eggs treated when 3-7 h old but not of those treated when 24-48 h old..