Studies On Indoxacarb Toxicity And Its Effects On Selected Biological Parameters Of The German Cockroach, Bla Ttella Germanica Cl.) (Dictyoptera: Bla Ttellidae)
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Date
2005-03
Authors
Teo, Edwin Hong Hua
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Abstract
This study focuses on the toxicity of indoxacarb, a relatively new insecticide
compound and its effects on several biological parameters of the German
cockroach, B/attefla germanica (L.). When treated topically on both nymphal
and the adult stages of German cockroaches, it was found that its performance
was comparable to chlorpyrifos, but slower than deltamethrin. Sublethal effects
studies revealed that treatment of LOso doses on nymphal and adult stages did
not cause any profound effect on nymphal development, neither did it cause
any significant effects on incubation period and preoviposition period. However,
total, number of nymphs produced by the treated females showed a significant
reduction (P < 0.05) when compared with that of the untreated ones. In
addition, the longevity of treated adult males were also affected by sublethal
dose of ind<?xacarb. Further studies were conducted using indoxacarb and
,noviflumuron (a relatively new chitin synthesis inhibitor) at several
concentrations (1, 10, 50 & 100 mg/m2
) to evaluate their effects on simulated
German cockroach populations. For both compounds, a single treatment only
lasted for 3 months and retreatment was needed. Significant control of the
simulated population was achieved with indoxacarb at 100 mg/m2 when
~.,i compared to that of the untreated population at 6'" month post-treatment, while ~,' noviflumuron caused population elimination at the alh month, Bait formulations
containing indoxacarb in the form of gel (0.1, 0.5 and 1.0% indoxacarb) and bait
station (0.1 %) were evaluated in this study. Comparison was made with several
bait formulations containing fipronil and hydramethylnon. In the evaluation of
bait stations, fipronil at 0.03% and 0.05% showed better efficacy than
indoxacarb (0.1 %). Indoxacarb was also found to exhibit secondary kill effects
towards German cockroaches.
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Keywords
New insecticide compound and , its effects on German cockroach