			Home About us Contact

Nematicidal Activity (nematicidal + activity)

Distribution by Scientific Domains

Chemistry	50%
Life Sciences	35%

Selected Abstracts

ChemInform Abstract: Reaction of Active Methylene Compounds with 4-Dimethylaminobenzalaniline and Nematicidal Activity of the Products (III).

CHEMINFORM, Issue 25 2009
Amardeep Kaur
Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a "Full Text" option. The original article is trackable via the "References" option. [source]

ChemInform Abstract: Synthesis and Nematicidal Activity of 2-(1H-Benzo[d]imidazol-2-ylmethyl)-4-aryl-1-thia-4-azaspiro [4.5]decan-3-one.

CHEMINFORM, Issue 35 2008
A. Srinivas
Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a "Full Text" option. The original article is trackable via the "References" option. [source]

Nematicidal activity of anion transport blockers against Meloidogyne incognita, Caenorhabditis elegans and Heterorhabditis bacteriophora

PEST MANAGEMENT SCIENCE (FORMERLY: PESTICIDE SCIENCE), Issue 6 2008
Dhana Raj Boina
Abstract BACKGROUND: Because methyl bromide has been phased out as a soil sterilant, new nematicides are urgently needed. Four different chemical classes of organic acids acting as anion transport (AT) blockers were tested against a free-living nematode, Caenorhabditis elegans Maupas, a plant-parasitic nematode, Meloidogyne incognita (Kofoid and White) Chitwood, and an entomopathogenic nematode, Heterorhabditis bacteriophora Poinar, in toxicity bioassays. The materials tested were DIDS (4,4,-diisothiocyanatostilbene-2,2,-disulfonic acid), 9-AC (anthracene-9-carboxylic acid), NPPB [5-nitro-2-(3-phenylpropylamino)benzoic acid] and IAA-94 (indanyloxyacetic acid). RESULTS: All the compounds showed slowly developing nematicidal activity against second-stage juveniles of M. incognita and adults of C. elegans, but not against H. bacteriophora infective-stage juveniles. The LC50 values of these compounds were < 50 mg L,1 after 48 and 72 h incubation, while at 168 h incubation the LC50 values were < 10 mg L,1 for both sensitive species. Across both species and time, the LC50 values generally differed no more than twofold among the four compounds tested in this study. In contrast, none of the compounds (200 mg L,1) caused more than control mortality to H. bacteriophora, even after 168 h of incubation. CONCLUSION: These compounds are potential leads for commercial nematicides. The insensitivity to H. bacteriophora is consistent with the natural exposure of this nematode to DST (3,5-dihydroxy-4-isopropylstilbene), a stilbene produced by its symbiotic bacterium. Based on the known activity of the compounds used in this study, it is suggested that anion transporters form the probable target sites for DIDS, 9-AC, NPPB and IAA-94 in nematodes. Copyright © 2008 Society of Chemical Industry [source]

Nematicidal activity of Trigonella foenum- graecum L.

PHYTOTHERAPY RESEARCH, Issue 6 2001
Tayyaba Zia
Abstract The aqueous, methanol and chloroform extracts of Trigonella foenum-graecum caused significant (p,< 0.05) mortality of Meloidogyne javanica larvae. The methanol soluble fraction eluted from pure distilled water showed the highest (>92%) nematicidal activity compared with the fractions eluted from pure methanol and different ratios of chloroform and methanol indicate that the nematicidal compound was polar in nature. Copyright © 2001 John Wiley & Sons, Ltd. [source]

Nematicidal activity of powder and extracts of Melia azedarach fruits against Meloidogyne incognita

ANNALS OF APPLIED BIOLOGY, Issue 2 2010
N.G. Ntalli
Pulverised lyophilised (dehydrated) Melia azedarach (Meliaceae) fruits (PMF) were tested in a dose,response pot experiment against juveniles (J2) of the root-knot nematode Meloidogyne incognita. Successively, with different extraction procedures, a polar (melia methanol extract, MME) and a non-polar (melia oil, MO) fragments were obtained and their effects were tested on nematode motility and development, in dose and time response bioassays and pot experiments. An EC50 value was calculated for all experiments. A dose,response effect was found in pot bioassays using PMF and, after an incubation period of 24 and 48 h, the EC50 values were calculated at 0.41% and 0.34% w/w, respectively. Motility bioassays revealed a dose and time dependent response effect, after exposure to MME, but not to MO. Doses of MME higher than 0.08% were nematicidal, whereas lower ones were nematostatic (the loss of motility as a result of the presence of the substance was reversible). In a pot experiment, MME doses higher than 2.5% w/w caused 100% nematode control with EC50 value of 0.916% w/w. [source]

Nematicidal Metabolites Produced by the Endophytic Fungus Geotrichum sp.

CHEMISTRY & BIODIVERSITY, Issue 7 2007

Abstract From the endophytic fungal strain Geotrichum sp. AL4, cultivated from the leaves of the neem tree (Azadirachta indica), four compounds, 1,4, were isolated from the AcOEt extract, including two new, chlorinated, epimeric 1,3-oxazinane derivatives. All compounds were assessed for their nematicidal activities against the nematodes Bursaphelenchus xylophilus and Panagrellus redivivus, and three out of the four isolates showed noticeable bioactivities. [source]

Characterization and gene cloning of a novel serine protease with nematicidal activity from Trichoderma pseudokoningii SMF2

FEMS MICROBIOLOGY LETTERS, Issue 2 2009
Lei-Lei Chen
Abstract Trichoderma pseudokoningii SMF2 is a biocontrol fungus with inhibitory ability against phytopathogenic fungi. Here, a crude extract of strain SMF2 in a solid ferment exhibited strong nematicidal activity against Meloidogyne incognita, and a novel serine protease SprT with nematicidal activity was purified from the crude extract. Protease SprT has a molecular mass of 31 kDa, a pH optimum of 8.5, and a temperature optimum of 60,65 °C. It had good thermostability, and was stable in an alkaline environment. SprT could degrade bovine serum albumin, lysozyme, and gelatin, and its activity was enhanced by many metal ions. The cuticles of nematodes treated by protease SprT obviously crimpled. Purified protease SprT could kill juveniles of M. incognita and inhibit egg hatch, suggesting that it is involved in the nematicidal process of T. pseudokoningii SMF2. The full-length cDNA gene-encoding protease SprT was cloned by rapid amplification of cDNA ends. Sequence analysis showed that SprT is a monodomain subtilase containing 284 amino acid residues. It had higher identities and a closer relation to the nematicidal serine proteases (59,69%) from nematode parasitic fungi than to the serine proteases (<50%) from Trichoderma. Protease SprT represents the first well-characterized subtilase with nematicidal activity from Trichoderma. [source]

Pathogenesis of Streptoverticillium albireticuli on Caenorhabditis elegans and its antagonism to soil-borne fungal pathogens

LETTERS IN APPLIED MICROBIOLOGY, Issue 5 2002
J.-O. Park
Aims: To examine the biological activity of Streptoverticillium albireticuli. Methods: Isolation of S. albireticuli was carried out using the dry-heat technique. Nematicidal and pathogenic activity on Caenorhabditis elegans was measured by mortality in metabolites and colonization rate on fishmeal extract agar. Antifungal and enzymatic activities of S. albireticuli were measured by the agar plate method and the semidefined solid media method, respectively. Results:S. albireticuli showed strong nematicidal activity against C. elegans . Pathogenic activity was also evident with the colonized nematode by the isolate on fishmeal extract agar. It also showed antifungal activity against certain fungal pathogens such as Rhizoctonia solani , Phytophthora cinnamomi and Fusarium oxysporum . Significance and Impact of the Study: The discovery of an actinomycete showing pathogenic activity against the nematode may indicate the potential for it to be used as a biocontrol agent of parasitic nematodes, in addition to its ability to suppress fungal pathogens. [source]

Nematicidal activity of anion transport blockers against Meloidogyne incognita, Caenorhabditis elegans and Heterorhabditis bacteriophora

Screening and isolation of a nematicidal sesquiterpene from Magnolia grandiflora L.

PEST MANAGEMENT SCIENCE (FORMERLY: PESTICIDE SCIENCE), Issue 3 2007
Linjun Hong
Abstract The ethanolic extracts from 30 plant species were tested for their nematicidal activity against nematodes Bursaphelenchus xylophilus (Steiner & Buhrer) Nickle and Panagrellus redivivus (L.) Goodey. The leaf extract of Magnolia grandiflora L. exhibited the strongest nematicidal activity against both nematodes, causing 73 and 100% mortality respectively within 48 h at 5 mg mL,1. A new nematicidal sesquiterpene was obtained from the leaves of M. grandiflora. The compound was determined to be 4,5-epoxy-1(10)E,11(13)-germacradien-12,6-olide, based on spectroscopic methods including 2D NMR techniques. The median lethal concentrations (LC50) of the compound against B. xylophilus and P. redivivus were 71 and 46 mg L,1 respectively at 48 h. This is the first report of Magnoliaceae species with nematicidal activity. Copyright © 2007 Society of Chemical Industry [source]