I suppose it is one of the most common moth larvae in HK!!
All of the below records are from Southern District of HK Island:
At Februray 23, a female was found laying eggs
It seems to have habit of laying hundreds of eggs on concrete walls
On Februray 27, first instar larvae were found
Later, on April 8, many larvae were found.
The youger one:
The last instar:
I think its eating preference was the most diverse amongst the moth. It was found consume most Gramineae plant including roadside weed & Bamboo species. It also fed on Oxalis spp. And it was commonly found feeding on withered flower of various plants and also the plant tissue in birds' dropping!!!
On April 16, one of the last instar was pupated.
On April 23, freshly adult moth was emerged from the pupa. I think it should be a female.