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Titolo:
Permethrin resistance ratios compared by two methods of testing nymphs of the German cockroach, Blattella germanica
Autore:
Ladonni, H;
Indirizzi:
Tehran Univ Med Sci, Sch Publ Hlth, Dept Med Entomol, Tehran 14155, Iran Tehran Univ Med Sci Tehran Iran 14155 pt Med Entomol, Tehran 14155, Iran
Titolo Testata:
MEDICAL AND VETERINARY ENTOMOLOGY
fascicolo: 2, volume: 14, anno: 2000,
pagine: 213 - 216
SICI:
0269-283X(200006)14:2<213:PRRCBT>2.0.ZU;2-#
Fonte:
ISI
Lingua:
ENG
Soggetto:
INSECTICIDE RESISTANCE; PYRETHROID RESISTANCE; DICTYOPTERA; SYNERGISTS; MECHANISMS; ORTHOPTERA;
Keywords:
Blattella germanica; insecticide; mixed function oxidase; permethrin resistance; piperonyl butoxide; resistance ratio; synergist; tarsal contact bioassay; topical exposure test; Tehran; Iran;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
20
Recensione:
Indirizzi per estratti:
Indirizzo: Ladonni, H Tehran Univ Med Sci, Sch Publ Hlth, Dept Med Entomol, POB 6446,Tehran 14155, Iran Tehran Univ Med Sci POB 6446 Tehran Iran 14155 ran 14155, Iran
Citazione:
H. Ladonni, "Permethrin resistance ratios compared by two methods of testing nymphs of the German cockroach, Blattella germanica", MED VET ENT, 14(2), 2000, pp. 213-216

Abstract

For the German cockroach, Blattella germanica L. (Dictyoptera: Blattellidae), the permethrin resistance ratio (RR) was assessed by topical application and by tarsal contact tests, using first-instar nymphs of five strains from Tehran, Iran. Each test was replicated three or four times with 10 nymphs aged 2-3 days; mortality was scored 24 h post-treatment. The reference susceptible strain showed LD50 permethrin 0.0175 mu l/nymph from topical application, KT50 of 8.41 min and LT50 of 12.82 following tarsal contact with permethrin 15 mg/m(2). In four wild strains (F1 generation) the RR varied from 4.14 to 4.7 for mortality after topical application, from 4.2 to 6.45 for mortality and 17-27 for knockdown following tarsal contact tests. Hence, overall knockdown results gave much higher RRs than for mortality data. Resistance ratios based on both methods of treatment were very similar: one strain showed a slightly higher value by topical application (RR 4.6 vs. 4.2,i.e. 1.1-fold difference) whereas the other three strains gave slightly greater RR (1.2-1.4 fold) by tarsal contact. Resistance was abolished by cotreatment with the synergist piperonyl butoxide plus permethrin (ratio 3 : 1 required for full efficacy), indicating that mixed-function oxidases were inhibited as a major metabolic pathway in all four resistant strains.

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Documento generato il 17/01/20 alle ore 20:11:23