Найдено научных статей и публикаций: 2, для научной тематики: Ovicidal
1.
Vivek Kempraj and Sumangala.K.Bhat
- Pesticide Biochemistry and Physiology , 2011
The current study involved evaluation of the toxicity of acetone soluble fraction of the ethanol extract of
Annona squamosa Linn. seeds on Aedes albopictus (Skuse). Toxicity of fresh sample has been compared
with that of solar radiated and heat treated aliquots of the same. Acute toxicity of fresh a...
The current study involved evaluation of the toxicity of acetone soluble fraction of the ethanol extract of
Annona squamosa Linn. seeds on Aedes albopictus (Skuse). Toxicity of fresh sample has been compared
with that of solar radiated and heat treated aliquots of the same. Acute toxicity of fresh acetone fraction
on adults was evident with LC50 and LC90 values of 15.21 and 60.38 lg/ml, respectively. Larvicidal bioassays
recorded LC50 and LC90 values ranging from 0.44 to 5.97 and 1.64–43.36 lg/ml, respectively for different
instars. Ovicidal bioassays yielded EC50 and EC90 values of 18.82 and 69.61 lg/ml. The study
further revealed ovipositional deterrent and chemosterilant activities of the extract on the target mosquito.
Bioassays using solar radiation and heat treated samples of the active fraction have showed toxicity
levels similar to those of fresh sample. Chemical analysis of acetone soluble fraction of seed extract of A.
squamosa has reveled ethyl oleate and iso-octyl phthalate as major components. Adulticidal, larvicidal,
ovicidal, ovipositional deterrent and chemosterilant activities of the fraction on A. albopictus were proved.
The investigation further confirmed stability of the active fraction on exposure to solar radiation and high
temperature.
2.
Vivek Kempraj and Sumangala.K.Bhat
- Natural Product Radiance , 2008
The ovicidal and larvicidal efficacy of essential oils extracted from the tubers of Cyperus giganteus Vahl and Cyperus rotundus Linn. was studied on eggs and fourth instar larvae of Aedes albopictus (Skuse). The eggs and larvae were exposed to serial concentration of the oils ranging from 5-150 ppm ...
The ovicidal and larvicidal efficacy of essential oils extracted from the tubers of Cyperus giganteus Vahl and Cyperus rotundus Linn. was studied on eggs and fourth instar larvae of Aedes albopictus (Skuse). The eggs and larvae were exposed to serial concentration of the oils ranging from 5-150 ppm and kept under observation for 24h. Both the oils showed remarkable ovicidal and larvicidal activities indicated by EC50 values of <5 ppm and LC50 and LC90 values of <20 ppm. The results obtained suggest that the essential oils of these Cyperus species can serve as a potential source of natural mosquitocidal agents.