Description:
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.
Raw Url:
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Repository Record Id:
ir.library.oregonstate.edu:8336h482h
Record Title:
The effects of four anticholinesterase compounds on the embryology of Acheta domesticus (L.) (Orthoptera: Gryllidae)
http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/8336h482h