Cabbage Centre Grub
Hellula hydralis and Hellula undalis
Colour - Buff grey. Mottled.
Body - Small. Stout with long hair scales.
Wings - Mottled. 2 Pairs. Membranous. Hairy
Broad, Wingspan up to 180 mm in some species.
Mouthparts - Naked proboscis.
Antennae - 3 segments. Filiform (Finely hair like).
Legs - Broad overlapping scales. Feet (Tarsi) have 5 segments.
Head - Broad overlapping scales. Large rounded compound eyes.
Thorax - Broad overlapping scales. 3 segments. Front segment much smaller. Hairy
Abdomen - Broad overlapping scales. 7-11 segments. Spiracles on segments 1-7. Hairy
Egg - Flat.
Habits - Can't fly when cold.
Colour - Pale yellow with dark marks on its back.
Body - 10-15 mm long, 5-10 mm wide.
Mouthparts - Chewing.
Antennae - Short. 3 segments.
Legs - 5 segments. Single claw on end.
Head - Hard.
Thorax - 10-11 segments. Spiracles on segments 1 to 8. Prolegs on segments 3, 6 and 10.
Habits - Herbivorous.
Eggs are laid on the host plant. Caterpillar mines the leaves when young then bores into the growing point. It pupates on the host.
Habitats:Origin and History:
Caterpillars bore into the centre of cabbages and other Brassicas. Minor pest of turnips in Victoria where it bores into the growing point.
Management and Control:In most years control is not economic.
Related Species:Cabbage Cluster Caterpillar (Crocidolomia pavonana), Cucumber Moth (Diaphania indica), Wax moths (Galleria mellonella and Achroia grisella), Rice moth (Corcyra cephalonica), Meal moth (Pyralis farinalis)
CSIRO. The Insects of Australia. Melbourne University Press. (1991) p889.
Victorian Department of Agriculture. Insect Bulletins. p24.
Collated by HerbiGuide. Phone 08 98444064 or www.herbiguide.com.au for more information.