ACUTE TOXICITY POTENTIAL OF PHORATE – AN ORGANO – PHOSPHATE

ACUTE TOXICITY POTENTIAL OF PHORATE – AN ORGANO – PHOSPHATE INSECTICIDE ON TWO DIFFERENT EARTHWORM SPECIES
Suneel Kumar and Satyendra M. Singh*
Earthworm Toxicology Unit, Earthworm Ecology and Environmental Research Laboratory,
Department of Animal Science, Mahatma Jyotiba Phule Rohilkhand University, Bareilly-243006 (Uttar Pradesh), India
[Corresponding author E-mail*: satyendramsingh@rediffmail.com]
Received: 12-03-2016 Revised: 19-03-2016 Accepted: 31-03-2016

Abstract:
Several studies have been conducted on the acute toxicity of organophosphates; however very little information is available on the acute toxicity of phorate which is one of the most popular organophosphorous widely applied in pest infested crops in India. The present investigations were made to evaluate the acute toxicity of phorate using contact filter paper method, as per OECD (1984) guidelines in two different endogeic earthworm species Metaphire posthuma and Eutyphoeus waltonii. The acute toxicity (LC50) of phorate was found 20-40 μl /cm2 at the end of 48 hrs and was considered as ‘very toxic’ to both experimental worms. The
purpose of the study was to assertion its minimal dose to be applied to kill the pests but not the earthworms. These findings showed that a dose of less than its acute toxicity level may be applied in the crops that will not affect the earthworms.

Keywords: Toxicity, organophosphates, Earthworm, crops

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