Effect of Azadirachtin on vitellogenesis of Labidura riparia (Insect Dermaptera)

Sayah, Fouad; Fayet, Claire; Idaomar, Mohamed; Karlinsky, A.

doi:10.1016/s0040-8166(96)80077-2

Cited by 45 publications

(30 citation statements)

References 25 publications

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“…In bumblebees, as well as in distinct insect species, juvenile hormone (JH) and ecdysteroids are the main hormones linked to the behavioural and physiological aspects of the reproduction 33,34 . Such hormonal disturbances caused by azadirachtin are in general linked to damages on ovarian development or related processes 35,36 . These impairments include blockage of oogenesis, disruption of vitellogenesis and vitelline envelope formation, degeneration of follicle cells and breakdown of yolk protein production 29,35 .…”

Section: Discussionmentioning

confidence: 99%

“…Such hormonal disturbances caused by azadirachtin are in general linked to damages on ovarian development or related processes 35,36 . These impairments include blockage of oogenesis, disruption of vitellogenesis and vitelline envelope formation, degeneration of follicle cells and breakdown of yolk protein production 29,35 . However, since azadirachtin has antifeedant effects against insects, the impact on ovarian development and consequently reproduction may be additionally attributed to a low food intake or uptake.…”

Section: Discussionmentioning

confidence: 99%

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Lethal and sublethal effects of azadirachtin on the bumblebee Bombus terrestris (Hymenoptera: Apidae)

et al. 2014

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Background: Lethal and sublethal effects of azadirachtin were studied on Bombus terrestris via oral exposure in the laboratory to bring out the potential risks of the compound to this important pollinator.Results: Microcolonies chronically exposed to azadirachtin via treated sugar water during 11 weeks in the laboratory exhibited a high mortality ranging from 32 to 100 % with a range of concentrations between 3.2 and 320 mg litre , azadirachtin significantly inhibited the egg laying and, consequently, the production of drones during 6 weeks. When azadirachtin was tested under an experimental setup in the laboratory where bumblebees need to forage for food, the sublethal effects were stronger as the numbers of drones were reduced already with a concentration of 0.64 mg litre -1 . Besides, a negative correlation was found between the body mass of male offspring and azadirachtin concentration.Conclusion: Azadirachtin can affect B. terrestris with a range of sublethal effects. This study confirms the need to test compounds on their safety, especially when they have to perform complex tasks such as foraging.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Lethal and sublethal effects of azadirachtin on the bumblebee Bombus terrestris (Hymenoptera: Apidae)

et al. 2014

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“…It is also a known disruptor of larval development of insects (Schmutterer 1990;Singh 2003;Rharrabe et al 2008). However, the reports are scarce about the efficacy of it on oogenesis (Sayah et al 1996;Denardi et al 2010) and reproductive potential of parasites. Moreover, no such information is available on the crustacean reproductive biology.…”

Section: Introductionmentioning

confidence: 99%

Effect of aqueous extract of Azadirachta indica A. Juss (neem) leaf on oocyte maturation, oviposition, reproductive potentials and embryonic development of a freshwater fish ectoparasite Argulus bengalensis Ramakrishna, 1951 (Crustacea: Branchiura)

2014

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In present study, a microcosm experiment is carried out to investigate the efficacy of 120 and 250-ppm crude aqueous extract of Azadirachta leaf on oocyte maturation, oviposition, embryonic development and hatching of the eggs of a fish ectoparasite Argulus bengalensis. Relative abundance of different maturing oocyte stages in the ovary of the parasite from different age groups was enumerated, and marked variations were obtained. Significant depletion in the abundance of pre-vitollogenic, vitellogenic and post-vitellogenic oocytes was recorded, which indicates impairment in maturation. Chromatin condensation of the oocytes of treated parasite indicates apoptosis of oogenic cells. Strong oviposition deterrence was evident by the elevated oviposition deterrence index of 0.18 and 0.52 at respective toxin levels. The treated parasites invested less number of eggs per oviposition, and hatching percentage of the eggs reduced markedly. In vitro treatment of eggs within 70 min of incubation exhibited coagulation of yolk material and subsequent reduction in hatching percentage. However, treatment applied after this critical period, hatching was not significantly altered. In vitro treatment of eggs at 80 min of incubation resulted in normal development. It signifies that azadirachtin affects the early developmental events but not the later. Presumably, azadirachtin either affects early gene expression of the embryo or antagonizes any of the substances of the zygote required for sustaining early developmental process. The result of the present experiment suggests that azadirachtin could be a promising agent to control argulosis through inhibition of the reproductive maturity of the parasite as well as through interference of its embryonic development.

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“…Mordue (Luntz) & Blackwell 1993, Isman 2006, and references herein), thereby negatively affecting moulting of the larvae as well as metamorphosis in the pupal stage and reproduction in the adults (e.g. Garcia & Rembold 1984, Sayah et al 1996, Otto 1997. Moreover, gut motility may be disturbed after ingestion of neem-treated plant material (Mordue (Luntz) et al 1985).…”

Section: Introductionmentioning

confidence: 99%

Aerial Spraying of Neemazal®-T/S Against the Forest Cockchafer (Melolontha hippocastani, Col.: Scarabaeidae) in South-West Germany: The Effects of Two Field Trials Performed in 2007 and 2008 on Local Populations

et al. 2015

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The forest cockchafer Melolontha hippocastani is a serious forest pest whose infestation levels have been increasing in South-West Germany since the mid-1980 s. During the past 25 years several control measures have been taken to manage its populations. In 2007 and 2008, 122 and 73 hectares of forest stands comprising of deciduous trees were sprayed with NeemAzal ® -T/S (1% azadirachtin A) by helicopter, respectively. Here we summarize the results of the accompanying research with the aim to evaluate the efficacy of NeemAzal ® -T/S in the control of M. hippocastani populations under field conditions. As expected from azadirachtin's mode of action, no immediate mortality occurred but maturation feeding and oogenesis was interrupted. It appeared that precise timing of the application is a crucial issue regarding the level of its effect on the population density. In 2007, the first application was performed in good synchrony with the climax of female emergence from the soil, resulting in a remarkable decline of the population density in the next generation of beetles in 2011. In 2008, our data suggest that maturation feeding and oogenesis had already been completed when the agent was sprayed. Hence, no significant decline of the population density could be registered in 2012. Practicability of the use of NeemAzal ® -T/S against M. hippocastani in forests is discussed.

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Effect of Azadirachtin on vitellogenesis of Labidura riparia (Insect Dermaptera)

Cited by 45 publications

References 25 publications

Lethal and sublethal effects of azadirachtin on the bumblebee Bombus terrestris (Hymenoptera: Apidae)

Lethal and sublethal effects of azadirachtin on the bumblebee Bombus terrestris (Hymenoptera: Apidae)

Effect of aqueous extract of Azadirachta indica A. Juss (neem) leaf on oocyte maturation, oviposition, reproductive potentials and embryonic development of a freshwater fish ectoparasite Argulus bengalensis Ramakrishna, 1951 (Crustacea: Branchiura)

Aerial Spraying of Neemazal®-T/S Against the Forest Cockchafer (Melolontha hippocastani, Col.: Scarabaeidae) in South-West Germany: The Effects of Two Field Trials Performed in 2007 and 2008 on Local Populations

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