Colour - Light brown and yellow with darker markings.
Body - Small. Stout with long hair scales. 10 mm long.
Wings - 2 Pairs. Membranous. Hairy. Wing span of 7 mm.
Mouthparts - chewing.
Antennae - 3 segments. Filiform (Finely hair like).
Legs - Broad overlapping scales. Feet (Tarsi) have 5 segments.
Head - Smooth. 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. Oval. Pale yellow.
Habits - Can't fly when cold.
Colour - Green.
Body - 10 mm long, 2 mm wide.
Mouthparts - Chewing.
Antennae - Short. 3 segments.
Legs - 5 segments. Single claw on end.
Head - Hard.
Thorax - 3 pair of legs.
Abdomen - 10-11 segments. Spiracles on segments 1 to 8. Prolegs on segments 3, 6 and 10.
Habits - Herbivorous. Wriggle from their shelters when disturbed.
Eggs laid on the upper side of leaves at any time of the year. There may be many generations per year. Most damage occurs just before flowering.
Habitats:Origin and History:
Caterpillars feed on lucerne leaves and can completely defoliate a stand in a month. Leaves and tips are rolled over and joined with silk to form a shelter for the caterpillar.
Management and Control:Spraying is usually not required unless numbers build up and seed production is threatened.
The first spray is normally applied when 30% of Lucerne terminals are rolled.
Related Species:Cabbage Centre Grub (Crocidolomia binotalis), 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) p873.
WADA. Insects and Allied Pests of Extensive Farming. Department of Agriculture - Western Australia Bulletin No. 4185. p56.
Collated by HerbiGuide. Phone 08 98444064 or www.herbiguide.com.au for more information.