Uptake, translocation, persistence and fate of azadirachtin in aspen plants (Populus tremuloides Michx.) and its effect on pestiferous two-spotted spider mite (Tetranychus urticae Koch)

Sundaram, K. M. S.; Campbell, Robert K.; Sloane, L.; Studens, J.

doi:10.1016/0261-2194(95)00026-i

Cited by 40 publications

(31 citation statements)

References 23 publications

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“…The effect of foliar residues of AZ-A on the spider mite population with time was evaluated. Details on the experiment are given elsewhere (Sundaram et al, 1995b).…”

Section: Study III -Systemic Action Of Az-a In Aspen Plants and The mentioning

confidence: 99%

Azadirachtin biopesticide: A review of studies conducted on its analytical chemistry, environmental behaviour and biological effects

Sundaram

1996

J. of Env. Sc. & Hlth., Part B

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“…The effect of foliar residues of AZ-A on the spider mite population with time was evaluated. Details on the experiment are given elsewhere (Sundaram et al, 1995b).…”

Section: Study III -Systemic Action Of Az-a In Aspen Plants and The mentioning

confidence: 99%

Azadirachtin biopesticide: A review of studies conducted on its analytical chemistry, environmental behaviour and biological effects

Sundaram

1996

J. of Env. Sc. & Hlth., Part B

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“…3) can probably be explained by delayed eVects of azadirachtin injection and may be due to toxication and/or starvation. A weakening eVect of systemically applied azadi- rachtin after a comparable period of time was also found by Sundaram et al (1995). They applied azadirachtin (0.2 g active ingredient/cm trunk diameter) to the roots of aspen trees (Populus tremuloides) to study the eVects of systemic uptake on densities of the mite Tetranychus urticae.…”

Section: Discussionmentioning

confidence: 88%

“…Sundaram et al 1995;Sundaram 1996). This systemic eVect can be achieved by the application of azadirachtin to the soil with uptake by the roots (e.g.…”

Section: Introductionmentioning

confidence: 98%

Effects of azadirachtin injection in litchi trees (Litchi chinensis Sonn.) on the litchi stink bug (Tessaratoma papillosa Drury) in northern Thailand

2006

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The litchi stink bug (Tessaratoma papillosa Drury) is one of the major pests of litchi (Litchi chinensis Sonn.) in tropical Asia. Systemic eVects of azadirachtin (at a concentration of 0.17 g active ingredient per centimeter trunk diameter) on T. papillosa were examined by injecting the dissolved product (NeemAzal U) into the trunks of four caged litchi trees in an orchard in northern Thailand. Four untreated caged trees served as control. Mean weekly mortality rates of individuals released on the treatment date (initially 55 nymphs per cage) were signiWcantly higher in the treatment cages (55%) than in the control cages (10%) between the second and the fourth week of the experiment. Mortality in the treatment cages was probably due to both toxic eVects (ecdysis inhibition) and antifeedant eVects (starvation). Weekly mortality rates of individuals released 2 weeks after tree injection (initially 20 nymphs per cage) were not signiWcantly diVerent between treatment and control cages, indicating a weakening eVect of azadirachtin, 2-3 weeks after tree injection. Azadirachtin concentration in ripe fruits was less than 5 mg/kg fruit pulp 18 days after tree injection. Although the results of this study are not yet suYcient for practical recommendations, they provide indications of alternative options for integrated pest management approaches. The azadirachtin tree injection method should also be tested against other pests of litchi, and of fruit trees in general.

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“…Veiga (1985) constatou a eficácia de produtos químicos no controle do ácaro verde no Estado de Pernambuco. No entanto, o controle químico é considerado antieconômico, pelo longo ciclo da cultura, o baixo retorno econômico e os recursos limitados dos produtores (Mansour & Ascher, 1983;Mansour et al, 1987;Dimetry et al, 1993;Mansour et al, 1993;Sundaram et al, 1995;Mansour et al, 1997;Miller & Uetz, 1998). No levantamento bibliográfico efetuado somente foi encontrado uma referência sobre o uso de extratos vegetais no controle do ácaro verde, na qual extratos aquosos de nim e cravo-da-índia, Syzigium aromaticum L., nas concentrações 5 e 10% provocaram mortalidade de fêmeas entre 85 e 100% (Gonçalves et al, 1999).…”

Section: Introductionunclassified

Extratos aquosos de plantas e o comportamento do ácaro verde da mandioca

Gonçalves

Oliveira

Barros

et al. 2001

Sci. agric. (Piracicaba, Braz.)

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. Dom. Manoel de Medeiros s/n, Dois Irmãos -CEP: 52171-900 -Recife, PE. 2 Bolsista CNPq.*Autor correspondente RESUMO: Extratos de plantas são uma alternativa promissora no controle de ácaros fitófagos. Neste trabalho estudou-se a bioatividade de extratos aquosos de nim, Azadirachta indica A. Juss. e cravo-da-índia, Syzigium aromaticum L., na biologia do ácaro verde da mandioca, Mononychellus tanajoa (Bondar). Larvas recém-eclodidas foram individualizadas em discos de folhas de mandioca previamente imersos nos extratos e em água destilada, e mantidas nestas condições até atingir a fase adulta. Após a emergência, as fêmeas foram individualizadas em discos não tratados e acasaladas com machos coletados da criação estoque. As avaliações foram efetuadas a cada 12 h. As duas maiores concentrações de nim (1,0 e 0,75g do pó de sementes de nim 100 mL -1 de água) deram os melhores resultados, causando 72,5 e 37,5% de mortalidade larval, respectivamente, e até 16% para os estágios seguintes. A mortalidade em todo estágio imaturo foi de 84,6 e 55%, respectivamente. A duração da fase deutocrisálida e teliocrisálida foi levemente afetada, porém significativamente maior para o nim a 1%. Os extratos não afetaram a fecundidade, a qual variou de 6,5 a 8,6 ovos/fêmea/dia. Embora os extratos usados não tenham afetado o período de incubação, nim a 1% reduziu significativamente a viabilidade dos ovos. Palavras-chave: Mononychellus tanajoa, Tetranychidae, acari, planta inseticida, praga AQUEOUS PLANT EXTRACTS AND THE BEHAVIOR OF THE CASSAVA GREEN MITEABSTRACT: The use of plant extracts is a promising alternative for the control of phytophagous mites. This study was carried out to test the bio-activity of neem, Azadirachta indica A. Juss. and clove, Syzigium aromaticum L., aqueous extracts on the behaviour of the cassava green mite, Mononychellus tanajoa (Bondar). Recently hatched larvae were individualized onto cassava leaf discs previously immersed in different concentrations of the extract and in distilled water, and maintained at these conditions until reaching maturity. The females were individualized onto untreated leaf discs right after emergency and mated with males from the rearing stock. The evaluations were taken each 12 h. The two highest neem concentrations (1.0 and 0.75g of ground neem seeds 100 mL -1 water) gave the best results, causing 72.5 and 37.5% of larval mortality, respectively. Mortality of other stages was up 16%. The mortality of the combined immature stages was 84.6 and 55%, at neem concentrations of 1.0 and 0.75%, respectively. The duration of the deutochrysalis and teleiochrysalis stages was slightly but significantly longer for neem at 1.0% probability. The plant extracts did not affect female fecundity, which ranged from 6.5 to 8.6 eggs/female/day. Although the extracts used did not affect the incubation period, neem extract significantly reduced egg viability at 1% probability.

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Uptake, translocation, persistence and fate of azadirachtin in aspen plants (Populus tremuloides Michx.) and its effect on pestiferous two-spotted spider mite (Tetranychus urticae Koch)

Cited by 40 publications

References 23 publications

Azadirachtin biopesticide: A review of studies conducted on its analytical chemistry, environmental behaviour and biological effects

Azadirachtin biopesticide: A review of studies conducted on its analytical chemistry, environmental behaviour and biological effects

Effects of azadirachtin injection in litchi trees (Litchi chinensis Sonn.) on the litchi stink bug (Tessaratoma papillosa Drury) in northern Thailand

Extratos aquosos de plantas e o comportamento do ácaro verde da mandioca

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