The Experts below are selected from a list of 195 Experts worldwide ranked by ideXlab platform
Alfian Rusdy - One of the best experts on this subject based on the ideXlab platform.
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EFEKTIVITAS EKSTRAK NIMBA DALAM PENGENDALIAN ULAT GRAYAK (Spodoptera litura F.) PADA TANAMAN SELADA Effectiveness of Neem Extract in Controlling Armyworm (Spodoptera Litura F.) in Lettuce
2020Co-Authors: Alfian RusdyAbstract:Research objectives were to evaluate effectiveness of seed and leaf Neem Extracts at various concentrations in controlling armyworm in lettuce. Experimental design used was factorial completely randomized design, consisting of eight combinations of treatment with three replications. Factors examined were firstly Neem extract of seed and leaf and secondly concentration of the Neem Extracts, which consists of four levels for each of the 5%, 10%, 15% and 20%. Variables observed were mortality, percentage of pupa, percentage of imago, and intensity of damaged plants. Results showed that use of seed and leaf Extracts of Neem plant can control armyworm (Spodoptera litura F.) in lettuce plants. Seed extract was more toxic than leaf extract of Neem. The most effective concentration was 20 cc/100 ml solution (20%), followed by 15 cc (15%), 10 cc (10%), and 5 cc (5%).
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EFEKTIVITAS EKSTRAK NIMBA DALAM PENGENDALIAN ULAT GRAYAK (Spodoptera litura F.) PADA TANAMAN SELADA
2009Co-Authors: Alfian RusdyAbstract:Effectiveness of Neem Extract in Controlling Armyworm (Spodoptera Litura F.) in Lettuce Alfian Rusdy Fakultas Pertanian Unsyiah, Darussalam Banda Aceh ABSTRACT Research objectives were to evaluate effectiveness of seed and leaf Neem Extracts at various concentrations in controlling armyworm in lettuce. Experimental design used was factorial completely randomized design, consisting of eight combinations of treatment with three replications. Factors examined were firstly Neem extract of seed and leaf and secondly concentration of the Neem Extracts, which consists of four levels for each of the 5%, 10%, 15% and 20%. Variables observed were mortality, percentage of pupa, percentage of imago, and intensity of damaged plants. Results showed that use of seed and leaf Extracts of Neem plant can control armyworm ( Spodoptera litura F.) in lettuce plants. Seed extract was more toxic than leaf extract of Neem. The most effective concentration was 20 cc/100 ml solution (20%), followed by 15 cc (15%), 10 cc (10%), and 5 cc (5%).
F. A. Gutierrez-miceli - One of the best experts on this subject based on the ideXlab platform.
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Effect of pest-controlling Neem and mata-raton on bean growth, soil N and soil CO_2 emissions
Agronomy for Sustainable Development, 2008Co-Authors: J. A. Montes-molina, M. Luna-guido, J. M. Ceballos-ramirez, F. Fernández-luqueño, N. Espinoza-paz, R. Rincón-rosales, L. Dendooven, F. A. Gutierrez-miceliAbstract:Extracts of plants such as Neem ( Azadirachta indica A. Juss.) and mata-raton ( Gliricidia sepium (Jacquin)) are used to control pests. However, certain components of Neem, such as azadirachtin, can exert a negative effect on fungi and nitrifying bacteria, and, in turn, can impact the C and N cycles in soil. Nutrient cycling might thus be inhibited and affect the sustainability of an agricultural system in which plant Extracts are used to control pests. Here, we investigated the effect of Neem extract on microbial activity and N mineralization in soil. We studied the effect of Neem and mata-raton leaf Extracts on bean growth ( Phaseolus vulgaris L.), nodule formation by Rhizobium , soil CO_2 emissions and soil N dynamics. Four treatments were applied: (1) “Neem treatment”: Extracts of Neem leaves, (2) “mata-raton treatment”: Extracts of mata-raton, (3) “chemical treatment”: a chemical insecticide, lambda cyalothrin, and (4) “control”: untreated plants. Our results show that in non-amended soil the number of nodules in the Neem treatment was 18 for beans cultivated. This nodule number was 2.1 times lower compared with the soil treated with lambda cyalothrin (chemical treatment). In manure-amended soil, the number of nodules was 28 in the Neem treatment. This nodule number was 1.6 times lower than in the mata-raton treatment. This indicated that Neem Extracts inhibited Rhizobium in soil and nodule formation in bean. In the manure-amended soil, the emission of CO_2 was 1.9 times lower in the Neem-treated soil than in the other treatments. The increase in the concentration of NO _3 ^− was 1.03 mg N kg^− soil day^− in the Neem treatment and 4.1 times lower compared with the other treatments. As such, microbial activity was inhibited by the Neem Extracts when added to the manure-amended soil. It was found that application of Neem leaf extract inhibited microbial activity and reduced nodule formation in bean, but lambda cyalothrin or leaf Extracts of Gliricidia sepium did not.
Opender Koul - One of the best experts on this subject based on the ideXlab platform.
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insect growth regulating and antifeedant effects of Neem Extracts and azadirachtin on two aphid species of ornamental plants
Journal of Biosciences, 1999Co-Authors: Opender KoulAbstract:Leaf disc choice test bioassay demonstrated that formulated Neem seed Extracts were highly deterrent and growth regulatory to rose aphid,Microsiphum rosae (L.) and Chrysanthemum aphid,Macrosiphoniella sanbornii (Gillete). Effective concentrations to produce 50% feeding deterrence was 0.80 and 0.84% respectively for 2nd instar nymphs irrespective of bioassay duration. The disruption of aphid feeding was related to the presence of azadirachtin concentration in the extract. The toxicity on contact from the leaf surface or via topical application due to azadirachtin was significantly different and topical treatment was at least 7 times more effective for both species. Thus growth regulatory effects of azadirachtin were influenced by the host plant and the stage of treatment. Field evaluation with formulated Neem Extracts revealed the effect to be more of growth regulatory nature thereby showing that azadirachtin is a physiological toxin for aphid species. Neem seed Extracts reduced the population of aphid on respective host plants significantly, EC50 values being 0.88 and 0.96% forM. rosae andM. sanbornii respectively.
J. A. Montes-molina - One of the best experts on this subject based on the ideXlab platform.
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Effect of pest-controlling Neem and mata-raton on bean growth, soil N and soil CO_2 emissions
Agronomy for Sustainable Development, 2008Co-Authors: J. A. Montes-molina, M. Luna-guido, J. M. Ceballos-ramirez, F. Fernández-luqueño, N. Espinoza-paz, R. Rincón-rosales, L. Dendooven, F. A. Gutierrez-miceliAbstract:Extracts of plants such as Neem ( Azadirachta indica A. Juss.) and mata-raton ( Gliricidia sepium (Jacquin)) are used to control pests. However, certain components of Neem, such as azadirachtin, can exert a negative effect on fungi and nitrifying bacteria, and, in turn, can impact the C and N cycles in soil. Nutrient cycling might thus be inhibited and affect the sustainability of an agricultural system in which plant Extracts are used to control pests. Here, we investigated the effect of Neem extract on microbial activity and N mineralization in soil. We studied the effect of Neem and mata-raton leaf Extracts on bean growth ( Phaseolus vulgaris L.), nodule formation by Rhizobium , soil CO_2 emissions and soil N dynamics. Four treatments were applied: (1) “Neem treatment”: Extracts of Neem leaves, (2) “mata-raton treatment”: Extracts of mata-raton, (3) “chemical treatment”: a chemical insecticide, lambda cyalothrin, and (4) “control”: untreated plants. Our results show that in non-amended soil the number of nodules in the Neem treatment was 18 for beans cultivated. This nodule number was 2.1 times lower compared with the soil treated with lambda cyalothrin (chemical treatment). In manure-amended soil, the number of nodules was 28 in the Neem treatment. This nodule number was 1.6 times lower than in the mata-raton treatment. This indicated that Neem Extracts inhibited Rhizobium in soil and nodule formation in bean. In the manure-amended soil, the emission of CO_2 was 1.9 times lower in the Neem-treated soil than in the other treatments. The increase in the concentration of NO _3 ^− was 1.03 mg N kg^− soil day^− in the Neem treatment and 4.1 times lower compared with the other treatments. As such, microbial activity was inhibited by the Neem Extracts when added to the manure-amended soil. It was found that application of Neem leaf extract inhibited microbial activity and reduced nodule formation in bean, but lambda cyalothrin or leaf Extracts of Gliricidia sepium did not.
R P Singh - One of the best experts on this subject based on the ideXlab platform.
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behavioral and physiological effects of Neem azadirachta indica seed kernel Extracts on larval parasitoid bracon hebetor
Journal of Chemical Ecology, 1998Co-Authors: S Raguraman, R P SinghAbstract:An aqueous suspension and an ethanolic extract of Neem seed kernel (NSK) at 0.3, 0.6, 1.2, 2.5, and 5.0% concentrations were tested for ovipositional deterrency, feeding deterrency, toxicity, sterility, and insect growth regulatory effects on a larval parasitoid, Bracon hebetor. Neither NSK Extracts delivered in the food or by contact influenced the B. hebetor oviposition (parasitization). They also did not cause parasitoid sterility through feeding, but they showed feeding deterrent effects for a limited period. Parasitoid eggs and pupae also were unaffected by the Extracts tested. The parasitoid larvae, however, were killed by feeding contaminated host larvae and also through contact with Neem Extracts. Thus, a minimum safety period is suggested for inundative releases of B. hebetor in integrated pest management.
