Expression of resistance to the root-knot nematodes,Meloidogyne hapla andM. fallax, in wildSolanum spp. under field conditions

1996 ◽  
Vol 102 (9) ◽  
pp. 859-865 ◽  
Author(s):  
Geert J. W. Janssen ◽  
Richard Janssen ◽  
Arend van Norel ◽  
Brigitte Verkerk-Bakker ◽  
J. Hoogendoorn
Keyword(s):  
Field Conditions ◽  
Meloidogyne Hapla ◽  
Root Knot Nematodes

Population fluctuations of root-knot nematodes Meloidogyne chitwoodi and M. hapla under field conditions

2021 ◽  
Author(s):  
Emre Evlice ◽  
Halil Toktay ◽  
Gökhan Yatkın ◽  
Fatma Dolunay Erdoğuş ◽  
Mustafa İmren
Keyword(s):  
Field Conditions ◽  
Population Fluctuations ◽  
Meloidogyne Chitwoodi ◽  
Root Knot Nematodes

Isolate-by-cultivar interaction in root-knot nematodes Meloidogyne hapla, M. chitwoodi, and M. falla× on potato

1998 ◽  
Vol 76 (1) ◽  
pp. 75-82 ◽  
Author(s):  
J.G. Van der Beek ◽  
P.F.G. Vereijken ◽  
L.M. Poleij ◽  
C.H. Van Silfhout
Keyword(s):  
Meloidogyne Hapla ◽  
Root Knot Nematodes

scholarly journals Anaerobic Soil Disinfestation Reduces Viability of Sclerotinia sclerotiorum and S. minor Sclerotia and Root-Knot Nematodes in Muck Soils

2020 ◽  
Vol 110 (4) ◽  
pp. 795-804
Author(s):  
Andres D. Sanabria-Velazquez ◽  
Anna L. Testen ◽  
Ram B. Khadka ◽  
Zhe Liu ◽  
Fuqing Xu ◽  
...  
Keyword(s):  
Carbon Source ◽  
Sclerotinia Sclerotiorum ◽  
Wheat Bran ◽  
Carbon Sources ◽  
Ethanol Solution ◽  
Meloidogyne Hapla ◽  
Root Knot Nematodes ◽  
Soil Disinfestation ◽  
Anaerobic Soil Disinfestation ◽  
Muck Soil

Experiments were conducted to evaluate potential functional and mechanistic differences in the suppression of Sclerotinia sclerotiorum and S. minor and root-knot nematodes in muck soils by anaerobic soil disinfestation (ASD) using different carbon source amendments. Volatile compounds produced during ASD in muck soil amended with molasses, wheat bran, or mustard greens at 20.2 Mg/ha or a 2% ethanol solution significantly reduced the mycelial growth and number of sclerotia produced by both Sclerotinia spp. compared with the anaerobic control. In amended soils, acetic and butyric acids were detected in concentrations that reduced the viability of sclerotia of both pathogens. Higher concentrations of carbon dioxide were observed in ASD-treated soils, regardless of the amendment, than in the nonamended anaerobic control. Only amendment with wheat bran did not increase the production of methane gas during ASD compared with the controls. Meloidogyne hapla survival was completely suppressed in soils treated with ASD regardless of carbon source. Field trials were conducted in Ohio muck soil to assess survival of sclerotia of both Sclerotinia spp. The viability of sclerotia of both Sclerotinia spp. was significantly reduced in soil subjected to ASD amended with wheat bran (20.2 Mg/ha), molasses (10.1 Mg/ha), or wheat bran (20.2 Mg/ha) plus molasses (10.1 Mg/ha) compared with the controls. A consistent negative correlation between soil reduction and viability of sclerotia of both pathogens was observed. Wheat bran and molasses are both widely available amendments that can be used as ASD carbon sources for the management of soilborne pathogens in muck soils.

scholarly journals Field Validation of the Effect of Soil Fumigation of Ethanedinitrile (EDN) on the Mortality of Meloidogyne hapla and Carrot Yield Parameters

Agronomy ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 208
Author(s):  
Ondřej Douda ◽  
Marie Manasova ◽  
Miloslav Zouhar ◽  
Jonas Hnatek ◽  
Vaclav Stejskal
Keyword(s):  
Field Conditions ◽  
Root Weight ◽  
Meloidogyne Hapla ◽  
Field Validation ◽  
Available Nitrogen ◽  
Positive Effects ◽  
Yield And Quality ◽  
Plant Pest ◽  
Recent Phase ◽  
Phase Out

With the increasing importance of soilborne plant pest nematodes and the relatively recent phase-out of methyl bromide as a key soil fumigant, there is an urgent need for new fumigants with good nematicidal properties. Ethanedinitrile (EDN) is a promising fumigant and preparation because of its physical, agrochemical, and nematicidal properties. However, its efficacy against nematode pests of different crops under field conditions has not been fully validated and understood. Therefore, the aim of our study was to evaluate the effect of two concentrations of EDN on the survival of northern root-knot nematodes (Meloidogynehapla) and on carrot yield and quality under field conditions. The evaluation was performed using naturally infested carrot plots, and EDN application to the soil was followed by covering the treated area with film. A high biological effect was observed for both EDN concentrations tested, with even the lower dose (30 g·m−2) being sufficient for M. hapla suppression. Positive effects of EDN application—likely due to EDN partial conversion into biologically available nitrogen in soil—on carrot root weight, in comparison with the untreated control, were also observed.

scholarly journals Meloidogyne hapla, the Northern Root-Knot Nematode, in Florida Strawberries and Associated Double-Cropped Vegetables

EDIS ◽  
2019 ◽  
Vol 2019 (1) ◽  
Author(s):  
Johan Desaeger
Keyword(s):  
The State ◽  
Extension Agents ◽  
Crop Loss ◽  
Meloidogyne Hapla ◽  
Root Knot Nematode ◽  
Root Knot Nematodes ◽  
Fact Sheet ◽  
Nematode Parasites ◽  
And Behavior

Northern root-knot nematodes (Meloidogyne hapla) are rather uncommon nematode parasites of strawberries and vegetables in Florida, but when present they are capable of causing significant crop loss. Root-knot nematodes are largely unknown to strawberry growers in Florida and very little is known about their biology and behavior in the state. This 5-page fact sheet written by J. Desaeger and published by the UF/IFAS Department of Entomology and Nematology is intended to educate and provide information on this nematode to researchers, Extension agents, growers, industry representatives, and other stakeholders in the strawberry and vegetable community. http://edis.ifas.ufl.edu/in1224

scholarly journals Host Status of Lisianthus `Mariachi Lime Green' for Three Species of Root-knot Nematodes

HortScience ◽  
2004 ◽  
Vol 39 (1) ◽  
pp. 120-123 ◽  
Author(s):  
Martin Schochow ◽  
Steven A. Tjosvold ◽  
Antoon T. Ploeg
Keyword(s):  
Nematode Species ◽  
Meloidogyne Hapla ◽  
Cut Flower ◽  
Root Knot Nematode ◽  
Eustoma Grandiflorum ◽  
Root Knot Nematodes ◽  
Tomato Plants ◽  
Flower Production ◽  
Significant Damage ◽  
Host Status

Lisianthus [Eustoma grandiflorum (Raf.) Shinn.] plants were grown in soil infested with increasing densities of Meloidogyne hapla Chitwood, M. incognita (Kofoid & White) Chitwood, or M. javanica (Treub) Chitwood, root-knot nematodes. Compared to tomato plants grown in soil with the same nematode numbers and species, lisianthus had less severe root symptoms, suffered less damage, and resulted in lower nematode multiplication rates. Lisianthus was a better host for M. javanica than for M. incognita, and a poor host for M. hapla. Lisianthus shoot weights were significantly reduced after inoculation with M. javanica or M. hapla, but not after M. incognita inoculation. The number of flowers produced per lisianthus plant was reduced by all three nematode species. The results show that the root-knot nematode species that are most common in California may cause significant damage in the cut-flower production of lisianthus.

Greenhouse and field resistance in cucumber to root-knot nematodes

Nematology ◽  
1999 ◽  
Vol 1 (3) ◽  
pp. 279-284 ◽  
Author(s):  
S. Alan Walters ◽  
Todd C. Wehner ◽  
Kenneth R. Barker
Keyword(s):  
Cucumis Sativus ◽  
Multiple Root ◽  
Nematode Species ◽  
Nematode Resistance ◽  
Field Resistance ◽  
Field Conditions ◽  
Meloidogyne Arenaria ◽  
Root Knot Nematode ◽  
Root Knot Nematodes ◽  
Race 2

Abstract Ten cultigens were evaluated for resistance to Meloidogyne arenaria races 1 and 2, and M. javanica under greenhouse and field conditions. Resistance to M. arenaria races 1 and 2, and M. javanica was verified in Cucumis sativus var. hardwickii line LJ 90430 and to M. arenaria race 2 in C. sativus var. sativus Southern Pickler and Mincu in a greenhouse test. Another cultigen of C. sativus var. hardwickii (PI 215589) was found to be resistant to M. arenaria race 2 but not to other root-knot nematode species tested. LJ 90430 is the cultigen of choice to develop root-knot nematode resistant cucumbers, since it has multiple root-knot nematode resistance and is cross-compatible with cucumber. Greenhouse and field data were positively correlated (r = 0.74) over both years. Experiment repeatabilities were calculated from the cultigens infected with root-knot nematodes under both greenhouse and field conditions. Four environments (greenhouse and field over 2 years) were used in the analysis. Repeatabilities were high in all instances (ranging from 0.83-0.99) and indicated that the environment (field or greenhouse) was not an important factor in assessing root-knot nematode resistance for the cultigens evaluated. Resistenz von Gurkengegen Wurzelgallennematoden im Gewachshaus undim Freiland - Unter Gewachshausund Freilandbedingungen wurden zehn Cultigene auf ihre Resistenz gegen Meloidogyne arenaria Rassen 1 und 2 und gegen M. javanica gepruft. Bei Cucumis sativus var. hardwickii Linie LJ 90430 wurde im Gewachshausversuch Resistenz gegen M. arenaria Rassen 1 und 2 sowie gegen M. javanica nachgewiesen, und in C. sativus var. sativus "Southern Pickler" und "Mincu" Resistenz gegen M. arenaria Rasse 2. Cultigen C. sativus var. hardwickii (PI 215589) war resistent gegen M. arenaria Rasse 2 aber nicht gegen die anderen gepruften Arten von Wurzelgallennematoden. LJ 90430 ist das Cultigen der Wahl bei der Entwicklung von Gurken, die gegen Wurzelgallennematoden resistent sind, da es multiple Resistenzen gegen Wurzelgallennematoden besitzt und kreuzungsvertraglich mit Gurke ist. Die Ergebnisse der Gewachshaus- und Feldversuche waren uber beide Versuchsjahre hin positiv korreliert (r = 0,74). Ausgehend von den Cultigenen, die im Gewachshaus und im Freiland mit Wurzelgallennematoden infiziert waren, wurden die Wiederholbarkeiten der Versuche berechnet. Dabei wurden vier verschiedene Umweltbedingungen (Gewachshaus und Freiland uber zwei Jahre) verwendet. Die Wiederholbarkeiten waren in allen Fallen hoch (0,83-0,99) und zeigten an, dass die Umwelt (Freiland oder Gewachshaus) kein wichtiger Faktor bei der Bestimmung der Resistenz gegen Wurzelgallennematoden bei den gepruften Cultigenen war.

Morphology of the perineal pattern of the root-knot nematodes Meloidogyne hapla and M. incognita

1975 ◽  
Vol 53 (4) ◽  
pp. 370-373 ◽  
Author(s):  
R. H. Mulvey ◽  
P. W. Johnson ◽  
J. L. Townshend ◽  
J. W. Potter
Keyword(s):  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Light Microscopy ◽  
Meloidogyne Hapla ◽  
Root Knot Nematodes ◽  
Scanning Electron

Scanning electron microscope studies of Meloidogyne hapla and M. incognita revealed features of the female perineal pattern previously obscure under light microscopy. M. hapla is characterized by a deep invagination of the cuticle between the anal and vulval areas and a strong demarcation of dorsal and ventral striae. M. incognita lacks the infolding of the cuticle and is characterized by forked striae.

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