Spodoptera mauritia

Spodoptera mauritia (Boisduval, 1833)
(one synonym : Prodenia acronyctoides)
Lawn Armyworm
AMPHIPYRINAE , NOCTUIDAE

Don Herbison-Evans ( donherbisonevans@yahoo.com )
&
Stella Crossley

(updated 21 August 2008)

These eggs were laid on the painted wall of a house, as a hairy irregular mass about 0.5 cms. across. The baby Caterpillars were white with big black heads, about 0.1 cm long. They descended from the wall on silken threads.

The young Caterpillars are smooth-skinned and green with longitudinal lines.

Later, the Caterpillars become brown with two rows of black triangles down the back. When disturbed, they drop, and curl into a spiral with the head in the middle.

They are an international agricultural pest on crops and pastures, feeding on plants from the family POACEAE such as:

Bermuda Grass ( Cynodon species ),

Kikuyu ( Pennisetum clandestinum ),

Sorghum ( Sorghum bicolor ), and

Rice ( Oryza sativa ),

as well as:

Horsetail She Oak ( Casuarina equisetifolia, CASUARINACAE ).

The Caterpillars grow to a length of about 3 cms.

They burrow into the soil below the plant where they pupate without a cocoon.

(Photo: courtesy of Boris Branwhite, Wadalba)

The adult moth is brown with a complex pattern of light marks on the forewings. It has a wingspan of about 4 cms.

(Specimen: courtesy of the Macleay Museum, University of Sydney)

The moth is preyed on by a Bolas Spider ( Celaenia species, ARANEIDAE ). This spider swings a silk thread with a sticky knob on the end, and emits a copy of the female moth's pheromone to attract the male moths.

Attempts to control the pest include the use of:

some sacking laid near the plants attacked, so that the Caterpillars will hide under that by daytime, and they may be then collected and disposed of, or

a garden roller at midnight (when they come out to feed),

Hormones,

its Nucleopolyhedrovirus ( BACULOVIRIDAE ),

the nematode Steinernema carpocapsae ( STEINERNEMATIDAE ),

The species occurs around the world, including:

Borneo,