Fipronil, a phenyl-pyrazole insecticide, is often used in rice (Oryza sativa L.) production agriculture, with elevated runoff concentrations and loads having potential toxicological effects on downstream aquatic environments. This study evaluated two species of aquatic plants-broadleaf cattail (Typha latifolia L.) and powdery alligator-flag (Thalia dealbata Fraser ex Roscoe)-placed in series ag...

Fipronil and dieldrin are known to inhibit GABA receptors in both mammals and insects. However, the mechanism of selective toxicity of these insecticides between mammals and insects remains to be seen. One possible mechanism is that insect GABA receptors are more sensitive than mammalian GABAA receptors to fipronil and dieldrin. We examined differential actions of fipronil and dieldrin on GABA-...

An indirect competitive enzyme-linked immunosorbent assay (ELISA) was developed for the quantitative detection of fipronil in some environmental samples. Polyclonal fipronil antibodies were produced from rabbits immunized by hapten (fipronil) protein conjugate. The conjugate was prepared by activating the carboxylic groups of proteins; keyhole limpet hemocyanin (KLH) or bovine serum albumin (BS...

long –term use of some of insecticides on rice striped stem borer (chilo suppressalis walk.) and for the reason the urgency of use of new suspension insecticide an experiment carried out, in paddy fields under condition at rice research institute in rasht, iran.treatments were as follow;1-fipronilg in first generation 2-fipronil g. in second generation 3-fipronil sc in first generation 0.5 lit....

Fipronil insecticide dissipated in California rice fields, producing half-lives of 10.5 to 125 h in water and 44.5 to 533 h in soil, depending on the formulation applied and the resulting differences in water solubility. The major degradation products were desthiofipronil in water and fipronil-sulfide in soil, while the sulfone and amide were less abundant. Fipronil was photolyzed rapidly to de...

Dogs are easily infested with fleas, ticks, and other ectoparasites serving as vectors for transmitting bacterial, viral, and parasitic diseases. Therefore, the use of ectoparasiticides is inevitable and important. The present investigation was undertaken with two specific objectives: one, to evaluate the safety of fipronil and cyphenothrin in dogs after topical application of Parastar® Plus, a...

Blattella germanica (L.) (Dictyoptera: Blattellidae) that were fed fipronil bait produced liquid excretions that were toxic to conspecifics. We have used a combination of analytical and behavioral assays to localize the source, to elucidate the time course, and to evaluate the role of these excretions in facilitation of secondary kill. Fipronil excretion coincided with the onset of the paralyti...

The stereoselective difference of chiral pesticide enantiomers is an important factor risk evaluation and the subject has received wide attention. In present work, enantioselective metabolism phenylpyrazole insecticides including fipronil, ethiprole flufiprole in rat liver microsomes was investigated vitro. result showed remarkable enantioselectivity for fipronil with EF values 0.11–0.58. metab...

In 1996, fipronil and malathion residues were evaluated after four ultra-low-volume (ULV) spray applications in northeastern Tarnaulipas, Mexico. Sprays were applied at 0.88 L/ha. Fipronil was applied at 28 and 56 g A.I./ha and malathion at 840 g A.I./ha. Four applications were made beginning 23 May at four, five and six day intervals. Leaf surface residues of malathion accumulated with each ap...

We examined the toxicity mitigation efficiency of a hydrologically modified backwater wetland amended with a pesticide mixture of atrazine, metolachlor, and fipronil, using 96 h survival bioassays with Hyalella azteca. Significant H. azteca 96 h mortality occurred within the first 2 h of amendment at the upstream amendment site but not at any time at the downstream site. H. azteca survival vari...