(Photo: courtesy of Harold McQueen, Goodna, Queensland)
These grubs are not true Caterpillars, but are the larvae of Stethopachys formosa, which are beetles in the family CHRYSOMELIDAE. They are a pest in Australia on
The larvae are off-white with a black head. The larvae grow to a length of about 2 cms.
The larvae bore into the budding stem of an Orchid, and create a stiff mess of foam around the borehole entrance, and pupate in their borehole.
The adult beetle is yellow-brown with a black band across the back, and black tips to the elytra, and black eyes, antennae, and legs. The beetles have a length of about 2 cms.
The eggs are little cylinders and yellow, laid in a line with mucus joining them.
The species is found in
Further reading :
Joseph Sugar Baly,
Descriptions of new genera and species of Phytophaga,
Journal of Entomology,
Volume 1 (1861), p. 194.
(written 8 April 2017)