Non Target Effect of Ethiprole + Imidacloprid 80 WG on
Predators of Rice Planthoppers
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Author:B. Vinoth Kumar*, N. Boomathi, N. Kumaran and S. Kuttalam
p-ISSN:0024-9602, e-ISSN:2582-5321, Vol:97, Issue:apr-jun
DOI: https://doi.org/10.29321/MAJ.10.100369
Abstract
Studies were conducted to evaluate ethiprole 40% + imidacloprid 40% - 80 WG as foliar
application for its toxicity against spiders and mirid bugs of rice in Tamil Nadu Agricultural
University, Coimbatore during 2006 - 2008. The higher dose of ethiprole 40% + imidacloprid
40% - 80 WG (125 g ha-1) recorded 41.20 and 58.13 percent reduction of spiders and 35.74 and
56.21 percent reduction of mirid bugs over control during first and second trials, respectively.
Whereas standard check, acephate 75 SP + endosulfan 35 EC (Tank mixture) @ 750 + 1000 g/ml
ha-1 recorded higher reduction of 59.79 % and 61.00 % of spiders and 50.70 % and 78.75 % of
mirid bugs over untreated control during first and second trials, respectively. A reduction in
the population of mirid bugs and spiders was observed immediately after the application of
insecticides. Though there was an initial set back in the population, it started increasing
gradually in the ethiprole 40% + imidacloprid 40% - 80 WG treated plots. However, the population
was found to be less when compared to untreated check. Hence ethiprole 40% + imidacloprid
40% - 80 WG treatments were found to be safer to the predators found in the rice ecosystem.
Key words : Ethiprole, Imidacloprid, spiders, mirid bugs, rice, safety