Sclerobia tritalis (Couch grass Webworm)
Colour - Grey to brown.
Body - Small. Stout with long hair scales. 10 mm long.
Wings - 2 Pairs. Membranous. Hairy.
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.
Habits - Can't fly when cold. Attracted to lights.
Colour - Translucent.
Body - Cylindrical. 15 mm long.
Mouthparts - Chewing.
Antennae - Short. 3 segments.
Legs - 5 segments. Single claw on end.
Head - Hard.
Thorax - 3 pairs of legs.
Abdomen - 10-11 segments. Spiracles on segments 1 to 8. Prolegs on segments 3, 6 and 10.
Habits - Herbivorous. Live in web shelters. Emerge when cool and damp - usually at night.
The moths lay eggs on grasses in the autumn. These hatch and the caterpillars burrow into the soil. They feed through out winter.
Habitats:Origin and History:
The caterpillar cuts grass plants off at ground level. They are a pest of pastures and turf.
Management and Control:Insecticides are used for control in turf and pastures.
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)
Collated by HerbiGuide. Phone 08 98444064 or www.herbiguide.com.au for more information.