BACKGROUND: Five formulated insecticides (lambda-cyhalothrin at 10 mg m−2, bifenthrin at 50 mg m−2, fipronil at 10 mg m−2, fenitrothion at 50 mg m−2, imidacloprid at 5 mg m−2) and one active ingredient (DDT at 500 mg m−2) were evaluated using a surface contact method against early and late instars and adults of two strains of the tropical bed bug, Cimex hemipterus (F.). Synergism of lambda-cyhalothrin and fipronil using piperonyl butoxide (PBO) was also assessed.

RESULTS: The order of susceptibility of different stages of bed bugs was as follows: early stage − lambda-cyhalothrin > bifenthrin = imidacloprid > fipronil > fenitrothion > DDT; late stage—lambda-cyhalothrin > bifenthrin > fenitrothion > imidacloprid > fipronil > DDT; adult—lambda-cyhalothrin > imidacloprid > bifenthrin > fenitrothion > fipronil > DDT. The late instars exhibited significantly higher LT50 among the life stages. The addition of PBO to fipronil increased the susceptibility of the insects.

CONCLUSIONS: Lambda-cyhalothrin, bifenthrin, fenitrothion and fipronil at the recommended application rates were effective against C. hemipterus. Although imidacloprid demonstrated good initial response against C. hemipterus, the insects showed substantial recovery 72 h post-treatment. The late instars (fourth and fifth instars) should be used as the model for toxicological evaluation. Copyright © 2011 Society of Chemical Industry

/pdf/surface-contact-toxicity-and-synergism-of-several-18203yz46h.pdf

Surface contact toxicity and synergism of several insecticides against different stages of the tropical bed bug, Cimex hemipterus (Hemiptera: Cimicidae)

BACKGROUND: Five formulated insecticides (lambda-cyhalothrin at 10 mg m−2, bifenthrin at 50 mg m−2, fipronil at 10 mg m−2, fenitrothion at 50 mg m−2, imidacloprid at 5 mg m−2) and one active ingredient (DDT at 500 mg m−2) were evaluated using a surface contact method against early and late instars and adults of two strains of the tropical bed bug, Cimex hemipterus (F) Synergism of lambda-cyhalothrin and fipronil using piperonyl butoxide (PBO) was also assessed RESULTS: The order of susceptibility of different stages of bed bugs was as follows: early stage − lambda-cyhalothrin > bifenthrin = imidacloprid > fipronil > fenitrothion > DDT; late stage – lambda-cyhalothrin > bifenthrin > fenitrothion > imidacloprid > fipronil > DDT; adult – lambda-cyhalothrin > imidacloprid > bifenthrin > fenitrothion > fipronil > DDT The late instars exhibited significantly higher LT50 among the life stages The addition of PBO to fipronil increased the susceptibility of the insects CONCLUSIONS: Lambda-cyhalothrin, bifenthrin, fenitrothion and fipronil at the recommended application rates were effective against C hemipterus Although imidacloprid demonstrated good initial response against C hemipterus, the insects showed substantial recovery 72 h post-treatment The late instars (fourth and fifth instars) should be used as the model for toxicological evaluation c © 2011 Society of Chemical Industry

The susceptibility of the bed bug, cimex hemiptelus fabricius, to certain synthetic contact insecticides, viz., DDT, lindane dieldrin, diazinon and malathion was investigated. The fifth nymphal stage of the insect was found to be more tolerant to insecticides than other nymphal instars or the adult bed bug.

Insecticide susceptibility of cimex hemipterus

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Insecticide susceptibility of cimex hemipterus