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- Title
Effect of chlorpyrifos and monocrotophos on locomotor behaviour and acetylcholinesterase activity of subterranean termites, Odontotermes obesus.
- Authors
Rao, J. Venkateswara; Parvathi, K.; Kavitha, P.; Jakka, N. M.; Pallela, R.
- Abstract
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 µg 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 24h. 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.
- Subjects
CHLORPYRIFOS; ACARICIDES; TERMITES; INSECTS; ODONTOTERMES
- Publication
Pest Management Science, 2005, Vol 61, Issue 4, p417
- ISSN
1526-498X
- Publication type
Article
- DOI
10.1002/ps.986