The effect of sublethal concentration of abate on aedes aegypti (linnaeus) and culex quinquefasciatus (says)
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Date
2007-04
Authors
Lim, Chia Shian
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Abstract
A laboratory study on the effectiveness and the sublethal effects of Abate on
several biological parameters of Aedes aegypti and Culex quinquefasciatus was
conducted using standard WHO bioassay technique. Late third instar larvae
were exposed to larvacide for twenty four hours. The LC50 and LCg5 obtained
using Probit analysis for Aedes aegypti were 0.0006 mgll and 0.001 mgll,
respectively, with a regression slope of 7.30 ± 0.60, whereas for Culex
quinquefasciafus were 0.00088 mgt! and 0.00249 mgll, respectively with a
regression slope of 3.64 ± 0.22.
Treated parent population (P) of Aedes aegypti, treated parent
population (P) and F1 of Culex quinquefasciatus larvae at sublethal
concentration of Abate showed prolonged larval duration. Treated F2 Aedes
aegypti and F1 Culex quinquefasciatu~ larvae showed significant increase in
the total eggs deposited. Significant differences were observed in the mean
number of eggs deposited by treated F2. F3 Aedes aegypti and treated F1
Culex quinquefasciatus (P<0.05). Significant reductions of egg hatching
percentage were found in treated F1 and F2 Aedes aegypti and treated F1 and
F3 of Culex quinquefascaitus (P<O.05). Significant differences were observed in
the mean adult emergence time of treated F3 female and male of Aedes aegypti
and treated F1 and F2 female of Culex quinquefasciatus (P<0.05). Percentage
mortality of F1. F2 and F3 Culex quinquefasciatus larvae were reduced
significantly (P<0.05). No mortality was observed in F1 Culex quinquefasciatus
pupae; F2 pupae showed significant increased in mortality (P<O.05). Blood
engorgement of F1 and F2 of Culex quinquefasciatus were reduced by 7.3%
and 4% respectively. Longevity of sucrose-fed population (P) of treated Culex
quinquefasciatus females and males and F2 females were reduced significantly
(P<O.05). Longevity of blood-fed treated F1 Aedes aegypti females, treated F2
and F3 Culex quinquefasciatus females were reduced significantly (P<O.05).
The proportion of Aedes aegypti males of the treated population (P), F1, F2 and
F3 were reduced, while the proportion of F3 females increased. The female
proportion of treated population (P) of Culex quinquefasciatus increased; the F1
male proportion was reduced. Abate did not affect blood engorgement, mean
pupation time, percentage mortality of larva and pupa and longevity of sucrose
fed female and male of Aedes aegypti; and the mean Culex quinquefasciatus
male emergence time.
The percentage mortality of treated F1, F2 and F3 Aedes aegypti and
Culex quinquefasciatus larvae after second exposure to LCso decreased.
Description
Keywords
Effectiveness and the sublethal effects of Abate on , several biological parameters of Aedes aegypti and Culex quinquefasciatus