Further Data On the Effect of Ammonia On the Termination of Diapause in Eggs of Teleogryllus Commodus (Walk.) (Orthoptera: Gryllidae)

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Abstract
The relationship between the concentration of ammonia and the period of application required to cause termination of diapause in T. commodus eggs was determined. Aliquots of ammonium hydroxide of specified concentration were used as a source of gaseous ammonia. It was shown that the higher the concentration of the ammonia the shorter was the period of exposure required to give a significant rise in the rate of termination of diapause. The extent to which the period could be reduced by raising the concentration was limited by the onset of toxicity at the higher concentrations. Similar results were obtained when the eggs were held in desiccators containing ammonium hydroxide. Prolonged exposure without appreciable loss of concentration of ammonia was practicable by this means. The pH of the contents of eggs exposed to ammonia was measured by taking successive samples over a period of 48 hr. This revealed that the pH rose rapidly by 0.15 units and then remained relatively constant over the period of observation.

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