Neem oil and neem oil components affect the efficacy of commercial neem insecticides

Stark, John D.; Walter, J. F.

doi:10.1021/jf00050a047

Cited by 65 publications

(29 citation statements)

References 13 publications

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“…Evidence suggests that other limonoids in neem extracts may increase the efficiency of products based on azadirachtin [29]. More than 130 limonoids have already been isolated from different parts of the neem plant [30].…”

Section: Discussionmentioning

confidence: 99%

Toxic effects of neem seed cake on the larval-pupal (prepupal) stage of Mediterranean fruit fly (Diptera: Tephritidae)

Silva¹,

Alvarenga²,

Bezerra-Silva³

et al. 2011

Fruits

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-Introduction. Traditionally the control of fruit flies is based on the use of pesticides, which increase production costs and have led to many environmental concerns. Our study aimed to evaluate the effect of neem cake on the larval and pupal stages of Ceratitis capitata. Materials and methods. Third instar larvae were transferred to plastic vials with neem cake in different proportions. The treatments consisted of vermiculite with neem cake in the concentrations: control (vermiculite only), then (10, 25, 50, 75 and 100)% of neem seed cake. The bioassay was completely randomized, with six treatments, ten replicates and ten third instar larvae per replicate. The results were statistically analyzed. Results. At concentrations of 75% or more of neem cake in vermiculite, practically no adult flies emerged. At 50%, more than 80% of the adults did not emerge and the pupal period was prolonged. The sex ratio of the adults was not affected after the contact of the pupae with the neem cake. The estimated lethal concentrations to kill 50% and 90% of the population were 30.6% and 51.6%, respectively. Conclusion. The neem seed cake has contact actions against the larval-pupal stage of C. capitata. Neem seed cake in the pupation substrate can cause high mortality when its concentration is 50% or more, and it prolongs the delay of the pupal period of C. capitata.Brazil / Azadirachta indica / Ceratitis capitata / Tephritidae / insect control / botanical pesticides / biological control Effet toxique du tourteau de graines de neem sur le stade prépupe de la mouche des fruits méditerranéenne (Diptera: Tephritidae).Résumé -Introduction. Traditionnellement, le contrôle de la mouche des fruits est basé sur l'utilisation de pesticides, ce qui augmente les coûts de production et conduit à de nombreux problèmes environnementaux. Notre étude a cherché à évaluer l'effet du tourteau de neem sur les stades larvaires et nymphaux de Ceratitis capitata. Matériel et méthodes. Des larves de troisième stade ont été transférées dans des flacons en plastique contenant de la vermiculite mélangée à du tourteau de graines de neem à diffé-rentes concentrations : le traitement témoin a été constitué de vermiculite seule ; cinq autres traitements ont été appliqués à partir de (10, 25, 50, 75 ou 100) % de tourteau de graines de neem ajoutés à de la vermiculite. Un bio-essai a été effectué selon un dispositif totalement aléatoire, avec six traitements, dix répétitions et dix larves par répétition. Les résultats ont été statistiquement analysés. Résultats. Dans les milieux contenant de la vermiculite à 75 % ou plus de tourteau de neem, pratiquement aucune mouche adulte n'a émergé. Dans les milieux à 50 %, plus de 80 % des adultes n'ont pas émergé et, pour ceux qui ont émergé, la période nymphale a été prolongée. La sex-ratio des adultes n'a pas été affectée après contact des chrysalides avec le tourteau de neem. Les concentrations mortelles de tourteau dans le substrat de pupaison estimées pour tuer 50 % et 90 % de la population de mouches ont ét...

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Section: Discussionmentioning

confidence: 99%

Toxic effects of neem seed cake on the larval-pupal (prepupal) stage of Mediterranean fruit fly (Diptera: Tephritidae)

Silva¹,

Alvarenga²,

Bezerra-Silva³

et al. 2011

Fruits

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“…Azadirachtin& neem seed oil are two key components which have been proven most fruitful agent, against the aphids like Brown citrus aphid, Toxoptera citricida (Kirk lady) by increasing in nymph as well as adult mortality and decreasing adult fecundity in all trial concentration [Tang et al, 2002]. Along with this, neem seed oil has some muffling effect on pea aphid, Acyrthosiphon pisum (Harris) nymphal mortality [Stark and Walter, 1995]. Based on the aphid mortality neem oil and its processed product are more efficient than azadiractin [Adan et al, 1998].…”

Section: 25mentioning

confidence: 99%

Competence of Biopesticide and Neem in Agriculture

Acharya¹,

Mir²,

Nayak³

2017

IJEAB

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“…Authors note that products enriched with oil are more efficient, by the presence of insecticidal compounds and the persistence of these in the plant and the physical effect on the insect (Gómez et al, 1997;Cubillo et al, 1999). Stark and Walter (1995), mentioned that there is 62% more efficiency in four products with 5% neem oil, compared to three non-oily products, identified in the first six limonoids in addition to azadirachtin.…”

Section: Mortality Assessment and Oviposition Inhibitionmentioning

confidence: 99%

“…While applying crude extracts of oil turns efficient for at least 5 d, being able to increase up to 10 d, gradually decreasing, this depending on the solvent used in extraction (Abdel-Salam et al, 2005). This is because neem oil increases the toxicity of the formulations, either because it promotes penetration into insect cuticle or contains other limonoids that increase their insecticidal activity, in addition that just oil confers greater persistence to the mixture (Stark and Walter, 1995). efectividad de los productos, después de las primeras horas de aplicación, se debe a este efecto (Silva et al, 2003), por lo que pudieran comportarse como insectistáticos no fitotóxicos, con regular persistencia.…”

Section: Mortality Assessment and Oviposition Inhibitionmentioning

confidence: 99%

Actividad biológica de nim en adultos de mosca blanca Trialeurodes vaporariorum (Aleyrodidae) West

Muñiz-Reyes

Barreto²,

Rodríguez-Hernández

et al. 2017

Remexca

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Los insecticidas químicos para controlar Trialeurodes vaporariorum West. han sido prácticamente la única herramienta utilizada, sin embargo la problemática global de contaminación ambiental y presión selectiva a insecticidas, ha fomentado un cambio en la forma de manejar las plagas más ecológicas y eficaces. El nim o neem Azadirachta indica es una opción como insecticidas botánicos, sus metabolitos ya se han comercializado en diferentes formulaciones, sin embargo es necesario evaluar su acción insecticida e insectistática. El objetivo de esta investigación fue comparar el efecto en la mortalidad, repelencia y oviposición de productos formulados de A. indica. En este estudio se probaron cuatro formulaciones a base de aceite de nim en adultos de T. vaporariorum. Los productos que mostraron la mortalidad más alta fueron Neem Oil Spray y PHC Neeem, a una concentración de 0.6 mg mL-1. El mejor efecto repelente fue de Neem Oil Spray (82.6%), PHC Neeem (72.3%), Biosave Neem (70.8%), y Neemix 4.5 (59.9%); los dos primeros muestran mayor persistencia con efecto similar a los 3 días de evaluación. El mejor inhibidor de la oviposición fue Neem Oil Spray (99.6% utilizando 1 mg mL-1), Biosave Neem (92.8%), PHC Neeem (82.6%), y Neemix 4.5 (57%). En contraste, Biosave Neem y Neemix 4.5 estimularon la oviposición en concentraciones de 0.01-0.3 mg mL-1 y PHC Neeem a 0.035 mg mL-1. La concentración de aceite en la formulación es determinante en el efecto, pues a mayor proporción, la formulación se hace más persistente, lo contrario la hace más polar y aumenta su capacidad sistémica.

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Neem oil and neem oil components affect the efficacy of commercial neem insecticides

Cited by 65 publications

References 13 publications

Toxic effects of neem seed cake on the larval-pupal (prepupal) stage of Mediterranean fruit fly (Diptera: Tephritidae)

Toxic effects of neem seed cake on the larval-pupal (prepupal) stage of Mediterranean fruit fly (Diptera: Tephritidae)

Competence of Biopesticide and Neem in Agriculture

Actividad biológica de nim en adultos de mosca blanca Trialeurodes vaporariorum (Aleyrodidae) West

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