Abstract
1. 1. The Warsaw and Florida strains of the wax moth, Galleria mellonella, are different in their sensitivity to juvenilizing treatments such as: chilling, application of ecdysone mimic (RH-5849) and juvenile hormone analogue (hydroprene), and implantation of brain or corpora cardiaca-corpora allata complex. 2. 2. The low sensitivity of the Florida strain larvae to these treatments results from low allatotropic activity of the brain of treated larvae and low sensitivity of corpora allata of this strain to allatotropin released from the brain. 3. 3. In the case of the Florida strain, the insects tissues had lower sensitivity to hydroprene and RH-5849 treatments compared to the Warsaw strain. 4. 4. In the haemolymph of chilled Warsaw strain larvae a small ecdysteroid peak, reaching a maximum of 28.0 ± 8.1 pg of 20-hydroecdysone per 1 μ1 of haemolymph was observed. 5. 5. This peak appeared 6 hr after chilling; it was absent in the haemolymph of chilled Florida strain larvae. 6. 6. The significance of this ecdysteroid peak in the induction of supernumerary larval moulting is discussed .
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