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The efficacies of Abate 1-SG and Vectobac G were evaluated against the dengue vector Aedes albopictus in bromeliads in Malaysia The dosage for both insecticides was 1 gm/plant. Both insecticides were effective in controlling Ae, albopictus breeding with residual activity of up to 1 week with more than 76% mortality of immature stage$. INTRODUCTION MATERIALs AND METHODs In Southeast Asia, Aedes albQPictus (Skuse) has been incrirninated as a secondary vector of dengue fever and Ae. aagmpti (Linnaeus) as the principal vector of the disease (Russell et al., 1969; Chan et al., 1971; Jumali et aL, 1979; Harinasuta, 1984). Fanning et aL (1997) found Ae. notoson'ptus and Culex quinquojlrisciatus breeding in bromeliads in Queensland, Australia. In Malaysia, we found that bromeliads is also infested with Ae. albopictus. To date there is no program on control of dengue vectors in bromeliads. The objective of this study was to compare the eMcacy of Abate 1-SG and Vectobac G againstAe. albopictus in bromeliads in the field in Kuala Lumpur, Malaysia. The experiment was conducted at Tasek Perdana, a recreational area in Kuala Lumpur, Malaysia. Forty-five bromeliad plants (Aechmea chatinii) were chosen at randorn and divided into three groups with 15 bromeliad plants in each group. Each bromeliad plant in each group was assigned to receive one control agent each, narnely Vectobac G (granules formulation 200 ITU/mg) at 1 gm weight of granules/plant manufactured by Abbott Laboratories, North Chicago, IL. USA and Abate 1-SG at 1 grn weight of granules/plant manufactured by American Cyanamid Company, USA and supplied by Cyanamid Agricultural Products, Malaysia. Both Abate 1-SG (1% sand granule) and Vectobac G were applied to the leaf axils by hand. The third group of The Japan Society of Medical Entomology and Zoology NII-Electronic Library Service he apanSociety f edical ntom logy nd o logy 166 Med. Entomol. Zool. bromeliads served as control. Prior to treatment, the bromeliads were left undisturbed for Ae. albQPictus breeding to take place naturally. No other mosquito species were identified in this study. All the bromeliad plants in each group were sampled for immature stages (larvae and pupae) before treatment, 24hr after treatment and weekly thereafter. Sampling was conducted with a pipette from each plant. Numbers of dead and live immatures were recorded from each plant. Live immatures were replaced into respective plant axil. The percentage mortality was based on dead immature stages sampled by the pipette. The above experiment was conducted four times at different period, The experiment was conducted in the field between September 1996 to December 1997. Statistical analysis was performed using ANOVA and LSD test (Choi, 1978). REsuLTs AND DIscusSIoN Vectobac G yielded the highest Ae. albopictus mortality of 97.8%, Abate 1-SG 96.4% and control 1.9%, 24 hr after treatment, respectivety (Fig. 1). One week after treatment, Vectobac G showed 76.2% mortality, Abate l-SG 78.9% and control O.4%, respectively. Both insecticides were effective in controlling Ae. albQPictus population up to 2 weeks, with Vectobac G showed 65.4% mortality of immature stages, Abate 1-SG 68.1% and control 1.7%, respectively. There was no significant difference between Vectobac G and Abate 1-SG up to 2 weeks post-treatment (P>O.05) but both insecticides were significantly different to control {PO.05), Thus, both insecticides were effective up to 2 weeks in controlling Ae. albopictus in the bromeliad leaf axils. Studies by Novak et al. <1985) using formulations of temephos (AbateO) and Bacillus thurz'ngiensis israelensis (BTI) on corncob and dried coconut husk carriers were evaluated against Ae. aegmpti larvae in Puerto Rico. Granular formulations of BTI controlledAe. aegyPti in tires for 19 to 33 days. Granular formulations of 5% and 10% temephos gave continuous control in automobile tires for 27 to 127 days and 34 to 162 days, respectively. From our previous study (Sulaiman et al. 1997), Vectobac 12AS (aqueous suspension) controlled Ae. albopictus in tires for one week. Since leaf axils of brorneliads as a new habitat for the dengue vector in Malaysia, it is timely to control such habitat and both insecticides Vectobac G and Abate 1-SG would be effective with residual ac-

Evaluation of Abate 1-SG and Vectobac G in bromeliads infested with dengue vector Aedes albopictus (Skuse) in Kuala Lumpur, Malaysia