Effects of different formulations of neem oil-based products on control Zabrotes subfasciatus (Boheman, 1833) (Coleoptera: Bruchidae) on beans

Costa, Jacqueline Tonielo da; Forim, Moacir Rossi; Costa, Eveline Soares; Souza, Joseane Rodrigues de; Mondego, Janaina Marques; Boiça, Arlindo Leal

doi:10.1016/j.jspr.2013.10.004

Cited by 72 publications

(25 citation statements)

References 18 publications

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“…in female adults of another Diptera, Lutzomyia longipalpis (Lutz and Neiva). Previously, azadirachtin was reported to impair, with variable effects, the survival of different insect species . Strong variations in insects' susceptibility to azadirachtin were noted depending on insect order, species, formulation, or the method of application .…”

Section: Discussionmentioning

confidence: 99%

Azadirachtin effects on mating success, gametic abnormalities and progeny survival in Drosophila melanogaster (Diptera)

Oulhaci

Denis

Kilani-Morakchi

et al. 2017

Pest Management Science

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BACKGROUND: Azadirachtin is a prominent natural pesticide and represents an alternative to conventional insecticides. It has been successfully used against insect pests. However, its effects on reproduction require further analysis. Here we investigated lethal and sublethal effects of azadirachtin, on treated adults in a model insect, Drosophila melanogaster (Meigen). Dose-mortality relationships as well as several parameters of reproduction (mating, spermatogenesis, oogenesis and fertility) were examined.RESULTS: Neem-Azal, a commercial formulation of azadirachtin, applied topically on newly emerged adults, increased mortality with a positive dose-dependent relationship. The LD 50 (0.63 g) was determined 24 h after treatment using a non-linear regression. Adults surviving this dose had a mating success that was divided by 3 and a progeny production reduced by half when males were treated, and even more when females were treated. When combining probability of survival, of mating and reduced progeny, it appeared that LD 50 induced a 98% reduction in reproductive rates. Reduced progeny was partially explained by the effect of adult treatment on gametes number and abnormalities. The number of cysts and the apical nuclei positions within the cysts decreased by 29.7% and 20%, respectively, in males. In females, the number of oocytes per ovary and the volume of basal oocytes also decreased by 16.1% and 32.4%, respectively. CONCLUSION: Azadirachtin causes significant toxic effects in both sexes and decreases the fecundity and fertility of D. melanogaster. Females are more sensitive to azadirachtin.

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Section: Discussionmentioning

confidence: 99%

Azadirachtin effects on mating success, gametic abnormalities and progeny survival in Drosophila melanogaster (Diptera)

Oulhaci

Denis

Kilani-Morakchi

et al. 2017

Pest Management Science

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“…The nanoparticles required humidity and/or microbial enzymatic activity in order to degrade the biopolymer and release the active principle (Costa et al, 2014). Moreover, not all of the neem oil/extract was encapsulated.…”

Section: Screening Of Nanoformulationsmentioning

confidence: 99%

Evaluation of neem-based nanoformulations as alternative to control fall armyworm

2016

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Neem (Azadirachta indica A. Juss.) based insecticides are efficient for the control of various pest species, but their low residual effect and the lack of standardized formulations are problems for field use. Nanoformulations of neem in colloidal suspension or powder, containing the polymers poly (ε-caprolactone) (PCL), poly (β-hidroxibutirate) (PHB) or poly (methyl methacrylate) (PMMA), in capsules or spheres, were developed in order to reduce biodegradation of the active neem compounds and improve their residual effect. Corn leaves treated with the nanoformulations were offered to first instar larvae of fall armyworm during 10 days, observing mortality and larval weight and comparing it to a commercial neem oil and negative controls. The residual effect of the four most efficient nanoformulations was evaluated at 1, 3 and 7 days after spraying (DAS). Feeding preference tests with dual-choice (treatment vs. control) were performed with corn leaf disks at 1, 3 and 7 after DAS, and a preference index was determined 24 hours after larvae feeding on the disks. Some nanoformulations caused mortality up to 3 DAS and sublethal effects up to 7 DAS, but none outperformed the residual effect of commercial neem oil. All treatments showed phagodeterrence at 1 DAS, but this was lost over time. The short duration of the nanoformulations' efficacy suggests that there was little or no release of neem by the nanoparticles, so more studies are needed to improve the release kinetics of the nanoformulated products.Index terms: Azadirachta indica; Spodoptera frugiperda; polymeric nanoparticles; controlled-release formulations. RESUMOInseticidas à base de nim (Azadirachta indica A. Juss.) são eficientes para controle de várias espécies de pragas, porém o baixo efeito residual e a falta de padronização das formulações são um problema para uso em campo. Nanoformulações de nim em suspensão coloidal e em pó, contendo os polímeros poli-ε-caprolactona (PCL), poli-β-hidroxibutirato (PHB) e polimetilmetacrilato (PMMA) em cápsulas ou esferas, foram desenvolvidas, a fim de reduzir a biodegradação dos compostos ativos e melhorar seu efeito residual. Folhas de milho tratadas com as nanoformulações foram oferecidas a lagartas de primeiro ínstar de lagarta do cartucho durante 10 dias, observando-se a mortalidade e o peso larval e comparando com um óleo comercial de nim e controles negativos. O efeito residual das quatro nanoformulações mais eficientes foi avaliado aos 1, 3 e 7 dias, após a pulverização (DAP). Testes de preferência alimentar com dupla escolha (tratamento vs. controle) foram realizados com discos de folhas de milho aos 1, 3 e 7 DAP, e um índice de preferência foi determinado 24 horas após as lagartas se alimentarem nos discos foliares. Algumas nanoformulações causaram mortalidade até 3 DAP e efeitos subletais até 7 DAP, mas nenhuma superou o efeito residual do óleo comercial de nim. Todos os tratamentos apresentaram fagodeterrência em 1 DAP, mas esta foi perdida ao longo do tempo. A curta duração da eficiência das nanoformu...

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“…Neem [Azadirachta indica A. Juss (Sapindales: Meliaceae)] oil is a broad spectrum botanical pesticide commonly used for stored grain protection worldwide (Medeiros et al, 2007;Costa et al, 2014;Choupanian et al, 2017). In a recent study, the contact toxicity of neem oil nanoemulsions, were evaluated against S. oryzae and T. castaneum adults by filter paper impregnation method (Choupanian et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

Formulation and physicochemical characterization of neem oil nanoemulsions for control of Sitophilus oryzae (L., 1763) (Coleoptera: Curculionidae) and Tribolium castaneum (Herbst, 1797) (Coleoptera: Tenebrionidae)

Choupanian¹,

Omar²

2018

Turkish Journal of Entomology

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Effects of different formulations of neem oil-based products on control Zabrotes subfasciatus (Boheman, 1833) (Coleoptera: Bruchidae) on beans

Cited by 72 publications

References 18 publications

Azadirachtin effects on mating success, gametic abnormalities and progeny survival in Drosophila melanogaster (Diptera)

Azadirachtin effects on mating success, gametic abnormalities and progeny survival in Drosophila melanogaster (Diptera)

Evaluation of neem-based nanoformulations as alternative to control fall armyworm

Formulation and physicochemical characterization of neem oil nanoemulsions for control of Sitophilus oryzae (L., 1763) (Coleoptera: Curculionidae) and Tribolium castaneum (Herbst, 1797) (Coleoptera: Tenebrionidae)

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