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Susceptibility of Dysdercus species Boisduval (Hemiptera: Pyrrhocoridae) to Selected Synthetic Pyrethroids

  • A. M. Mambiri
  • B. M. Khaemba
Research Article

Abstract

Relative susceptibility of laboratory-established cultures of four populations of Dysdercus fasciatus Sign. and one population each of D. nigrofasciatus Stal., D. cardinalis Gerst. and D. superstitiosus (F.) to topical applications of Cypermethrin, fenvalerate and permethrin was investigated at Kibos, Kenya. The LD50 values of the three chemicals to populations of D. fasciatus were 0.0656-0.0757, 0.335-0.469, 0.442-0.505 µg/insect, respectively, while those for D. nigrofasciatus were 0.1690-0.2541, 0.481-0.504, 0.721-0.851 µg/insect. The LD50 values for D. cardinalis and D. superstitiosus were 0.1507, 0.714, 0.798 µg/insect and 0.0991 and 0.824 µg/insect of each of the three chemicals respectively. Based on D. fasciatus from Kibos as the reference strain, the relative susceptibility values of all populations of Dysdercus species studied were small (< four-fold) indicating that resistance was not apparent in the cotton stainers. Of the three insecticides tested, Cypermethrin was the most effective judging from the high toxicity ratios between it, fenvalerate and permethrin.

Key Words

Cotton stainers Dysdercus spp. susceptibility synthetic pyrethroids 

Mots Cléfs

Punaise du coton Dysdercus spp. DL50 applicateur de microgouttes sensibilité pyrethrinoïdes de synthèse action par contact 

Résumé

Des études ont été menées sur la sensibilité aux 3 pyrethrinoïdes (Cypermethrin, fenvalerate et permethrin) de 4 espèces de Dysdercus (D. fasciatus Sign., D. nigrofasciatus Stal., D. cardinalis Gerst. et D. superstitiosus [F.]) venant de Kenya, en utilisant des colonies d’insectes établies au laboratoire. L’étude de la mortalité, basée sur l’action de contact, a porté sur les nymphes femelles du cinquième stade, âgées de cinq à six jours. Les résultats ont montré que les pyrethrinoïdes de synthèse sont efficaces contre Dysdercus spp. Les LD50 de Cypermethrin, fenvalerate et permethrin sont respectivement 0.0656-0.0757, 0.335-0.469 et 0.442-0.505 mg/ml pour D. fasciatus, 0.1690-0.2541, 0.481-0.504 et 0.721-0.851 mg/ml pour D. nigrofasciatus, et 0.1507, 0.714 et 0.798 mg/ml pour D. cardinalis. Cepandant pour D. superstitiosus le DL50 de Cypermethrin est 0.0991-0.824 mg/ml. Les résultats ont montrés que l’espèce D. fasciatus est la plus sensible aux trois produits. Parmi les insecticides testés, Cypermethrin est le plus efficace alors que les fenvalerate et permethrin montrent leur efficacité dans l’ordre décroissant.

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Copyright information

© ICIPE 1988

Authors and Affiliations

  • A. M. Mambiri
    • 1
  • B. M. Khaemba
    • 1
  1. 1.Department of ZoologyUniversity of NairobiNairobiKenya

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