Sclerobia tritalis (Couch grass Webworm)
Family: - Pyralidae
Order: - Lepidoptera
Colour - Grey to brown.
Body - Small. Stout with long hair scales. 10mm 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. 15mm 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:
Caterpillars cut grass plants 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 for more information.