Paper Information

Title: 

TOXICITY OF FIPRONIL TO A SUSCPTIBLE AND PERMETHRIN RESISTANT STRAINS OF GERMAN COCKROACHES (DICTYOPTERA :BLATELLIDAE)

Type: SPEECH
Author(s): LADONI H.,NASIRIAN H.,SHAYEGHI M.
 
 
 
Name of Seminar: IRANIAN CONGRESS OF TOXICOLOGY
Type of Seminar:  CONGRESS
Sponsor:  SOCIETY OF TOXICOLOGY
Date:  2004Volume 8
 
 
Abstract: 

The German cockroach, Blattella germanica (L.), is the most important pest species in the entire world which for reason tiny body, feeding habit and special behavior, besides its adaptation to environment of the humans can cause the transmission of the factor of diseases and is the factor of the allergic diseases and the severity of it. The resistance of German cockroach to insecticides such as organochlorines, organophosphates, and pyrethroids has been investigated by several laboratories. The search for new insecticides and new methods of insecticide delivery to control the German cockroach continues because this insect remains one of the most economically and medically important pests of the urban environment. In this ongoing process, older chemicals are displaced because of insecticide resistance, increasingly strict regulations, and public demand for safer and more effective products. New active ingredients and innovative delivery tools emerge to provide effective means of dealing with infestations. One of the newest insecticides is fipronil, a fast-acting phenylpyrazole that blocks the transmission of signals by the inhibitory neurotransmitter g-amino butyric acid. It is higher toxicity of fipronil in insects than in mammals is due partially to the higher sensitivity of GABA receptors. It is highly toxic to the German cockroach and other pests of public and medical importance. Fipronil is a highly effective, broad-spectrum insecticide with potential value for the control of a wide range of crop, public hygiene, amenity and veterinary pests. It can generally be applied at low to very low dose rates to achieve effective pest control.
The development of resistance and cross-resistance are potential problems resulting from the over-use of any pesticides and fipronil is relatively new and thus currently free from this problem. Although attempts to monitor resistance of field-collected strains at the adult stage have been conducted in Iran very little information is currently available on the toxicity of fipronil to in german cockroach.
In the current study, in a resistance management design, the cross- resistance spectrum of a susceptible a number of permethrin resistant strains of German cockroaches collected from different hospitals and student dormitories, were compared with fipronil using three WHO standard testing methods, i.e. topical application, surface contact (WHO glass jar) and toxic baits.
The result of susceptibility tests on the permethrin indicated that the all field collected strains are resistant to permethrin with resistance ratios between 8.6 to 17.8 folds compared with a standard susceptible strain. Cross-resistance spectrum of permethrin resistant strains with fipronil indicated that the all strains are susceptible to fipronil.

 
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