Effects of azadirachtin on the moulting cycle, endocrine system, and ovaries in last-instar larvae of the milkweed bug, Oncopeltus fasciatus

Dorn, August; Rademacher, Johannes; Sehn, Elisabeth

doi:10.1016/0022-1910(86)90063-6

Cited by 89 publications

(52 citation statements)

References 18 publications

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“…Azadirachtin has sterilizing activity among different insect species 29,30 . This effect is generally attributed to disturbances in the synthesis or release of hormones or neurohormones involved in the insect reproduction 31,32 . 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 .…”

Section: Discussionmentioning

confidence: 99%

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%

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

et al. 2014

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“…Dysdercus fasciatus (Brunt, 1971) and Oncopeltus fasciatus (Dorn et al, 1986a) nymphs also have fused ovaries forming a heart-shaped structure on the midgut. Each ovary opens into a lateral oviduct that typically joins a dilated chamber.…”

Section: Discussionmentioning

confidence: 97%

Regression of the lateral oviducts during the larval-adult transformation of the reproductive system ofMelipona quadrifasciata andFrieseomelitta varia

Boleli

Simões

Bitondi

2000

Journal of Morphology

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“…1987 ), Diptera (Miller and Chamberlain 1989 ), Orthoptera (Ascher et al . 1989 ;Champagne et al 1989 ;Mordue et al 1985 ;Rao and Subrahmanyam 1986 ), Hemiptera (Dorn et al . 1986 ;Garcia and Rembold 1984 ;Koul 1984 ;Redfern et al 1982 ), and Hymenoptera .…”

Section: Limonoidsmentioning

confidence: 93%

“…Growth regulatory effects was attributed to a disruption of endocrine events as the downregulation of hemolymph ecdysteroid level through the blockage of release of PTTH, prothoracicotropic hormone, from the brain-corpus cardiacum complex or to a delay in the appearance of the last ecdysteroid peak showing a complete molt inhibition. These groups of meliacins have effect on insect reproduction, leading to disruption of ovarian development, fecundity, and fertility and prevention of oviposition (Dorn et al 1986 ). Female S. exempta when emerged from larvae topically treated with 0.01 and 0.1 μg azadirachtin exhibited reduced fecundity due to failure of many oocytes to mature (Tanzubil and McCaffrey 1990 ).…”

Section: Limonoidsmentioning

confidence: 98%

Phytochemical Pesticides

Walia¹,

Saha²,

Rana³

2014

Advances in Plant Biopesticides

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Many phytochemical pesticides exhibiting broad spectrum of activity against pests and diseases have long been considered as attractive alternative to synthetic chemical pesticides as they are biodegradable, target specifi c, and pose no or less hazard to the environment or to human health. Although a large number of studies suggest that plant-based materials do affect arthropod pests, vectors, and other pathogens, yet only a handful of botanicals are currently used in agriculture, and there are few prospects for commercial development of new botanical products. Several factors appear to limit the success of botanicals, most notably regulatory barriers and the availability of competing products of microbial origin that are cost-effective and relatively safe compared with their predecessors. In the context of agricultural pest management, botanical pesticides are best suited for use in organic food production and can play a much greater role in the production and post-harvest protection of food and food products in developing countries. There is thus a need to organize natural sources, develop quality control, adopt standardization strategies, and modify regulatory mechanisms.

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Effects of azadirachtin on the moulting cycle, endocrine system, and ovaries in last-instar larvae of the milkweed bug, Oncopeltus fasciatus

Cited by 89 publications

References 18 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)

Regression of the lateral oviducts during the larval-adult transformation of the reproductive system ofMelipona quadrifasciata andFrieseomelitta varia

Phytochemical Pesticides

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