A novel series of aryl hydrazono esters (AHE) (1–13) were synthesized (yield 76–98%) to study the oviposition responses in
Aedes albopictus (Skuse) mosquitoes for the first time. At a concentration ...of 10
μg
ml
−1 in dual choice experiment, among the screened compounds, AHE-12 showed remarkable oviposition attractant activity with an oviposition activity index (OAI) of +0.299 (greater than 95% confidence limit) comparable to
p-cresol (OAI +0.320) which is well-reported oviposition attractant for
Aedes aegypti. Conversely, AHE-10 exhibited highest oviposition deterrent activity with OAI −0.247. The possible utilization of these compounds will be in integrated vector management strategies.
A novel series of aryl hydrazono esters (AHE) (1–13) were synthesized (yield 76–98%) to study the oviposition responses in
Aedes albopictus (Skuse) mosquitoes for the first time. At a concentration of 10
μg
ml
−1 in dual choice experiment, among the screened compounds, AHE-12 showed remarkable oviposition attractant activity with an oviposition activity index (OAI) of +0.299 (greater than 95% confidence limit) comparable to
p-cresol (OAI +0.320) which is well-reported oviposition attractant for
Aedes aegypti. Conversely, AHE-10 exhibited highest oviposition deterrent activity with OAI −0.247. The possible utilization of these compounds will be in integrated vector management strategies.
The exposure of sublethal doses (25% emergence inhibition) of diflubenzuron (DFB) (0.0002 mg/liter) and azadirachtin (AZD; 0.0079 mg/liter) insect growth regulators was provided to late third—early ...fourth instars of Culex quinquefasciatus till emergence of adults to find out the effects on various biological and life table attributes of adults, and comparison was made with control (CTL) as well. Life expectancy of both males and females of DFB survivors was significantly less in comparison with AZD and CTL ones; however, it was nonsignificantly different between CTL and AZD. In all treatments, males were shorter lived than females of their respective treatments. DFB survivors showed significant reduction in number of blood-fed females, resulting in minimum of oviposition days, total number of egg rafts, total number of eggs, eggs per egg raft, eggs per female life span, and eggs per female per day than survivors of both AZD and CTL significantly, but these parameters did not differ significantly between CTL and AZD, except eggs per egg raft. The net reproductive rate, intrinsic rate of increase, and finite rate of increase were significantly less in DFB than rest of the survivors, whereas doubling time for generation was significantly high; however, difference in mean generation was not significant among them. This study reveals that DFB has the potency to affect severely the various life table attributes at sublethal dose, but AZD does not have such effectiveness at similar sublethal dose against Cx. quinquefasciatus.
Aedes mosquito control has gained much importance nowadays in view of rise in number of reported cases of dengue and chikungunya in India and other countries. In the present study, C21 attracticide ...(containing a pheromone and an insect growth regulator—IGR, developed by Defence Research and Development Establishment (DRDE), Gwalior, India was tested for its feasibility for surveillance and control of Aedes mosquito in a multicentric mode from October 2007 to June 2012 in urban (Delhi, and Bengaluru district, Karnataka) and suburban (Alappuzha district, Kerala) settings of the country in three phases.
Across the randomly selected households in each study area, two to four containers treated with attracticide (experimental) and untreated (control) were placed and monitored by trained surveillance workers on weekly/ fortnightly basis for determining the presence of eggs, larvae and pupae. Container positivity, percent larvae, egg and pupae collected were determined during different phases and analyzed statistically using SPSS 18.0.
Container positivity was found statistically significant at Bengaluru and Alappuzha, Kerala while in Delhi, it was found non-significant. Eggs collected from experimental containers were significantly higher in comparison to control at all the locations except Delhi. Also larvae collected from control containers were significantly higher at all the locations except Bengaluru. Pupae collected from control containers remained significantly higher at all the locations as no pupal formation was recorded from experimental containers.
The use of C21 attracticide hampered pupal formation, thus inhibiting adult population in the study areas. The study established that C21 attracticide was efficacious in the field conditions and has potential for use in surveillance and management of dengue and chikungunya mosquitoes.
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