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The potential of Pastruria penetrans for the biological control of Meloidogyne speciesChanner, A. G. De R. January 1989 (has links)
No description available.
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Pre - and post-emergent application effects of nemarioc-ag phytonematicide of growth of potato and suppression of meloidogyne incognitaSefefe, Selaelo Khutso January 2019 (has links)
Thesis (M. Agric. (Plant Protection)) -- University of Limpopo, 2019 / Damage and significant losses of potato cultivar due to Meloidogyne incognita has
become a serious challenge, after the withdrawal of synthetic chemical nematicides
due to their environment-unfriendliness. Various alternatives have been investigated
each with a wide range of drawbacks. Most phytonematicides were highly phytotoxic
to crops, while their effects on nematode suppression were highly variable. The use
of Nemarioc-AG phytonematicide at pre- and post-emergence would help in
determining the level that is effective in supressing M. incognita without being
phytotoxic. The objective of this study was to determine whether Nemarioc-AG
phytonematicide could serve as pre- and post-emergent phytonematicide without
inducing phytotoxicity while suppressing population densities of M. incognita. For
achieving this objective, treatments, namely, 0, 2, 4, 8 and 16 g of Nemarioc-AG
phytonematicide, were arranged in a randomised complete block design (RCBD),
with 7 replicates. Potato seed tubers were sown into 20 cm pots, Nemarioc-AG
phytonematicide placed above the tubers and covered with soil, after initiation of
treatments 5 000 eggs and second stage juveniles (J2) of M. incognita per plant
were inoculated. For post-emergent, treatments, replications and design were the
same as in pre-emergent. Potato seed tubers were sown and inoculated with 5000
eggs and second-stage juveniles (J2) of M. incognita per plant after 100%
emergence. Nemarioc-AG phytonematicide were applied 7 days after inoculation.
Trials were conducted in autumn (February-April) 2017 (Experiment 1) and repeated
in autumn 2018 (Experiment 2). Plant growth variables and selected nutrient
elements were collected and analysed using the Curve Fitting Allelochemical
Response Data (CARD) model and lines of best fit, respectively. In pre-emergent
application, Experiment 1, MCSP was established at 1.95 g, with the overall
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sensitivity (∑k) being equal to zero. Therefore, in Experiment 1 and Experiment 2, all
nutrient elements to increasing concentration of Nemarioc-AG phytonematicide
exhibited negative quadratic relations. In both Experiments, nematode variables over
increasing concentration of Nemarioc-AG phytonematicide on potato exhibited
negative quadratic relations, except in Experiment 1, where J2 in roots exhibited
positive quadratic relations, with models ranging between 72 to 99%. In post
emergent, Experiment 1, MCSP was established at 1.57 g, with the overall sensitivity
(∑k) being equal to 2. In Experiment 1 and Experiment 2, nutrient elements over
increasing concentration of Nemarioc-AG phytonematicide exhibited positive and
negative quadratic relations, with models ranging from 89 to 97%. In Experiment 1,
nematode variables over increasing concentration of Nemarioc-AG phytonematicide
exhibited negative quadratic relations, with models ranging between 92 and 98%.
Positive and negative relations suggested that the product stimulated and inhibited
plant growth or accumulation of selected essential nutrient elements, respectively.
Increasing concentration of Nemarioc-AG phytonematicide had stimulated certain
plant variables and inhibited population densities of M. incognita in pre- and post
emergent application; therefore, this product was suitable for use as pre- and post
emergent in management of nematodes on the test crop.
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Lippia javanica, meloidogyne incognita and bacillus interactions on tomato productivity and selected soil propertiesNgobeni, Gezani Lucas January 2003 (has links)
Thesis (M. Sc. (Biochemistry)) -- University of Limpopo, 2003 / Refer to document / National Research Foundation (NRF)
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The physiology of tomato plants infected with root-knot nematode, Meloidogyne javanica.Meon, Sariah. January 1978 (has links) (PDF)
Thesis (Ph.D.) -- University of Adelaide, Dept. of Plant Pathology, 1978.
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Factors influencing the population dynamics of Meloidogyne konaensis on coffee in HawaiiSerracin, Mario. January 2003 (has links)
Thesis (Ph. D.)--University of Hawaii at Manoa, 2003. / Includes bibliographical references.
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Factors influencing the population dynamics of Meloidogyne konaensis on coffee in HawaiiSerracin, Mario. January 2003 (has links)
Thesis (Ph. D.)--University of Hawaii at Manoa, 2003. / Includes bibliographical references.
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Screening for resistance to Meloidogyne incognita (Kofoid and White) Chitwood in Aeschynomene and Desmodium spp. and herbicide effects on Aeschynomene americana L.Pasley, Sherman F. January 1981 (has links)
Thesis (Ph. D.)--University of Florida. 1981. / Description based on print version record. Typescript. Vita. Includes bibliographical references (leaves 68-71).
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Mean concentration stimulation point of nemarioc-AL and nemafric-BL phyonematicides on cururbita pepo cultivar 'caserataLebea, Motsatsi Prescilla January 2017 (has links)
Thesis (M.Sc. (Agriculture in Horticulture)) -- University of Limpopo, 2017. / Butternut squash (Cucurbita pepo) is highly susceptible to root-knot (Meloidogyne species) nematodes. Nemafric-BL and Nemarioc-AL phytonematicides were being researched and developed for use in various crop farming systems for managing nematode numbers. However, the two products when not properly quantified are highly phytotoxic to crops. The Curve-fitting Allelochemical Response Dosage (CARD) computer based model was adopted to compute the Mean Concentration Stimulation Point (MCSP), which is a non-phytotoxic concentration. The objective of the study, therefore, was to determine whether the MCSP values of Nemarioc-AL and Nemafric-BL phytonematicides on squash under greenhouse, microplot and field conditions exist. Seedling were raised in 25-cm plastic bags filled with loam, pasteurised sand and Hygromix 2:1:1 (v/v) in the greenhouse , raised in 25-cm pots with pasteurised sand and loam 3:1 (v/v) on the microplot, and raised under field with Hutton sandy loam (65% sand, 30% clay and 5% silt). After establishment each plant was inoculated with 5 000 eggs and second-stage juveniles (J2) of M. incognita. Treatments comprised 0, 2, 4, 8, 16 and 32% concentration of Nemarioc-AL and Nemafric-BL phytonematicides with ten replicates. For greenhouse, treatments comprised 0.0, 0.8, 1.6, 3.2, 6.4 and 12.8% concentration of both Nemarioc-AL and Nemafric-BL phytonematicide with 10 replicates. For micro-plot and for field experiment treatments comprised 2.4, 4.8, 9.6, 19.2 and 38.4% of both Nemarioc-AL and Nemafric-BL with nine replicates. In all experiments, treatments were arranged in a randomised complete block design with ten replicates. In the greenhouse, Nemafric-BL phytonematicide had highly significant effects on dry fruit mass and significant on fruit number, but had no effect other plant variables recorded.
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Treatments contributed 51 to 71% in total treatment variation (TTV) of dry fruit mass and fruit number, respectively. However, at higher concentrations the same phytonematicide decreased fruit number by 66 to 137% and dry fruit mass by 6 to 14%. In the greenhouse, MCSP value for Nemafric-BL phytonematicide was 2.83% of which the overall Σk was 3 units. Plant variables and increasing concentration of phytonematicide exhibited quadratic relations. In microplot, Nemarioc-AL was highly significant for dry shoot mass and dry fruit mass with treatment contribution of 15 to 63% in TTV. At lower concentrations Nemarioc-AL phytonematicide increased dry shoot mass by 5%. However, with increasing concentrations dry shoot mass decreased from 7 to 30%. Phytonematicide increased dry shoot mass from 41 to 81% and decreased root galls from 3 to 73%. In microplot, MCSP value was 11.85%, with the Σk zero. Plant variables and increasing concentration of phytonematicide exhibited quadratic relations. In field experiment, Nemarioc-AL and Nemafric-BL phytonematicide treatment effect were not significant on any plant variables. In conclusion, the MCSP and Σk values appear to be location-specific since they were not similar in various locations.
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INTERACTION BETWEEN MELOIDOGYNE INCOGNITA AND RHIZOCTONIA SOLANI IN SEEDLING DISEASE OF COTTONCarter, William Whitney, 1941- January 1973 (has links)
No description available.
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Intercropping with resistant cultivars reduces early blight and root knot disease on susceptible cultivars of tomato (Lycopersicon esculentum)Smith, Linley Joy. January 2002 (has links)
Thesis (M.S.)--West Virginia University, 2002. / Title from document title page. Document formatted into pages; contains viii, 77 p. : ill. (some col.). Includes abstract. Includes bibliographical references (p. 71-77).
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