Dm. Hunter, VITELLOGENESIS IN AUSTRACRIS-GUTTULOSA (WALKER) (ORTHOPTERA, ACRIDIDAE) IN TROPICAL AUSTRALIA, Australian journal of entomology, 36, 1997, pp. 307-308
In tropical northern Australia, vitellogenesis in Austracris guttulosa
only occurs if two requirements are met: daylength exceeds 13 h and v
egetation is green. During the dry season (April-September), daylength
is short and vitellogenesis is inhibited regardless of vegetation con
dition. Daylength exeeds 13 h by mid October, and vitellogenesis begin
s by late October if there is green vegetation produced by recent rain
. But it is often dry during October and vitellogenesis is delayed unt
il it rains either in November or even December.