Effect of chlorpyrifos and monocrotophos on locomotor behaviour and acetylcholinesterase activity of subterranean termites, Odontotermes obesus

The acute toxicity of chlorpyrifos and monocrotophos to subterranean termites, Odontotermes obesus (Rambur), has been studied by a paper contact method. The LC50 values for chlorpyrifos and monocrotophos were 0.046 and 0.148 microgram cm(-2), respectively. Chlorpyrifos was 3.22-fold more toxic than...

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Bibliographic Details
Published in:Pest management science 2005-04, Vol.61 (4), p.417-421
Main Authors: Rao, J.V, Parvathi, K, Kavitha, P, Jakka, N.M, Pallela, R
Format: Article
Language:English
Subjects:
acetylcholinesterase
AChE
Animal behavior
Animals
application rate
behaviour
Biological and medical sciences
Chemical control
chlorpyrifos
Chlorpyrifos - pharmacology
Cholinesterase Inhibitors - pharmacology
Control
enzyme activity
enzyme inhibitors
Enzymes
Fundamental and applied biological sciences. Psychology
insect control
Insecticides - pharmacology
Insects
Isoptera - enzymology
Lethal Dose 50
locomotion
mechanism of action
monocrotophos
Monocrotophos - pharmacology
Motor Activity - drug effects
Odontotermes obesus
Pesticides
Phytopathology. Animal pests. Plant and forest protection
Protozoa. Invertebrates
subterranean termites
termites
Time Factors
wood products
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Summary:The acute toxicity of chlorpyrifos and monocrotophos to subterranean termites, Odontotermes obesus (Rambur), has been studied by a paper contact method. The LC50 values for chlorpyrifos and monocrotophos were 0.046 and 0.148 microgram cm(-2), respectively. Chlorpyrifos was 3.22-fold more toxic than monocrotophos. The effect of the pesticides on locomotor behaviour (velocity) and head acetylcholinesterase (AChE: EC 3.1.1.7) activity was estimated in LC50-exposed termites at intervals of 4, 8, 12, 16, 20 and 24 h. Chlorpyrifos- and monocrotophos-treated termites showed, respectively, 97 and 88% reduction in locomotor behaviour (velocity) after 24 h. At all time intervals the chlorpyrifos-treated termites exhibited more AChE inhibition and showed greater distorted behaviour than those exposed to monocrotophos. In vitro studies indicated that the I50 value (50% inhibition) for chlorpyrifos against AChE was 8.75 times that of monocrotophos.
ISSN:1526-498X
1526-4998
DOI:10.1002/ps.986