Graduate Thesis Or Dissertation
 

The effects of four anticholinesterase compounds on the embryology of Acheta domesticus (L.) (Orthoptera: Gryllidae)

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  • Two organophosphates (Ruelene and Tiguvon) and two carbamates (Sevin and Baygon) were administered topically at various sublethal concentrations to cricket eggs. All the pesticides caused an immediate decrease in the acetylcholinesterase (AChE) activity level in the embryo, but the level usually returned to normal within three days after dosage. The pesticides were found to be competitive inhibitors of AChE. When applied before the AChE was present, the pesticides caused a depression of AChE when it first appeared. Nymphs were more susceptible than eggs to all the pesticides tested, except Ruelene. Penetration through the chorion was never more than 10% and usually about 3%. Pretreatment of eggs with carbamates had no effect on the susceptibility of the nymphs to methyl parathion, another anticholinesterase agent. However, pretreatment of eggs with organophosphates increased the susceptibility of emerging nymphs to an anticholinesterase agent. When either Sevin or Ruelene was applied to three day old eggs, ACNE activity level was observed to be significantly higher at the time of hatching than it was in undosed controls. The higher level of AChE activity led to an increase in tolerance of emerging nymphs to anticholinesterase agents.
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file details HartmanMargaretJ1971.pdf 2017-08-14 Público Baixar