Histopathology of roots of three tomato cultivars infected with two separate isolates of the false root-knot nematode Nacobbus aberrans

2016 ◽  
Vol 148 (2) ◽  
pp. 393-403 ◽  
Author(s):  
V. A. Cabrera ◽  
N. Dottori ◽  
M. E. Doucet
Keyword(s):  
Root Knot Nematode ◽  
Tomato Cultivars ◽  
Nacobbus Aberrans

External secretions from the false root-knot nematode, Nacobbus aberrans

Nematologica ◽  
1998 ◽  
Vol 44 (3) ◽  
pp. 326-330 ◽  
Author(s):  
K. Evans ◽  
J. Rowe ◽  
N. VON MEN-DE ◽  
M. Gravato-Nobre ◽  
R.H. MANZANILLA-LόPEZ
Keyword(s):  
Root Knot Nematode ◽  
Nacobbus Aberrans

Nematode resistance: A useful tool for root-knot nematode (RKN) management in tomato.

EDIS ◽  
2019 ◽  
Vol 2019 (5) ◽  
pp. 5
Author(s):  
Homan Regmi ◽  
Johan Desaeger
Keyword(s):  
Methyl Bromide ◽  
Nematode Resistance ◽  
Root Knot Nematode ◽  
Root Knot Nematodes ◽  
Fact Sheet ◽  
Pests And Diseases ◽  
Soil Pests ◽  
Production Value ◽  
Tomato Cultivars ◽  
The Many

Tomatoes are a major commodity in Florida, with an estimated production value of $453 million. Among the many pests and diseases that affect tomatoes, nematodes are one of the major problems. Since the ban on methyl bromide, these ubiquitous soil pests have become much more difficult to manage. This 5-page fact sheet written by Homan Regmi and Johan Desaeger and published by the UF/IFAS Entomology and Nematology Department discusses the use of nematode-resistant tomato cultivars as a tool to help manage root-knot nematodes in Florida. http://edis.ifas.ufl.edu/in1250

scholarly journals The Root-Knot Nematode Resistance Gene Mi-1.2 of Tomato Is Responsible for Resistance Against the Whitefly Bemisia tabaci

2003 ◽  
Vol 16 (7) ◽  
pp. 645-649 ◽  
Author(s):  
Gloria Nombela ◽  
Valerie M. Williamson ◽  
Mariano Muñiz
Keyword(s):  
Bemisia Tabaci ◽  
Nematode Resistance ◽  
Root Knot Nematode ◽  
Root Knot Nematodes ◽  
Tomato Plants ◽  
Potato Aphid ◽  
Linked Gene ◽  
Nematode Resistance Gene ◽  
Tomato Gene ◽  
Tomato Cultivars

The tomato gene Mi-1.2 confers resistance against root-knot nematodes and some isolates of potato aphid. Resistance to the whitefly Bemisia tabaci previously has been observed in Mi-bearing commercial tomato cultivars, suggesting that Mi, or a closely linked gene, is responsible for the resistance. The response of two biotypes of B. tabaci to tomato carrying the cloned Mi was compared with that of the isogenic untransformed tomato line Moneymaker. Our results indicate that Mi-1.2 is responsible for the resistance in tomato plants to both B- and Q- biotypes. Mi-1.2 is unique among characterized resistance genes in its activity against three very different organisms (root-knot nematodes, aphids, and whiteflies). These pests are among the most important on tomato crops worldwide, making Mi a valuable resource in integrated pest management programs.

scholarly journals Susceptibility of six tomato cultivars to the root-knot nematode, Meloidogyne incognita

2007 ◽  
Vol 25 (1) ◽  
pp. 73 ◽  
Author(s):  
Sunil K. Singh ◽  
Uma R. Khurma
Keyword(s):  
Meloidogyne Incognita ◽  
Root Knot Nematode ◽  
Inoculum Level ◽  
Root Knot Nematodes ◽  
Egg Masses ◽  
Tomato Cultivars

Six tomato cultivars Moneymaker, Beefsteak, Roma, Summertaste, Mini Roma and Smallfry were tested for their susceptibility to root- knot nematodes at inoculum levels of 200, 400, 600 Juveniles (J2) per pot. All were found to be susceptible to varying degrees as egg masses were present in all with Moneymaker and Roma being the most susceptible and Mini Roma, the least susceptible. The inoculum levels had a significant effect (p<0.05) on the number of galls and plant weights. The gall numbers and plant weights was negatively correlated, with the highest gall numbers and lowest plant weights recorded at the highest inoculum level in all cultivars except in Mini Roma in which there was little variation in gall numbers and plant weights.

scholarly journals A Search for Resistance in Lycopersicon spp. to Nacobbus aberrans

Plant Disease ◽  
1997 ◽  
Vol 81 (2) ◽  
pp. 217-221 ◽  
Author(s):  
J. C. Veremis ◽  
G. B. Cap ◽  
P. A. Roberts
Keyword(s):  
Interspecific Hybrids ◽  
Germ Plasm ◽  
Root Knot Nematode ◽  
Root Knot Nematodes ◽  
Nematode Reproduction ◽  
Meloidogyne Spp ◽  
Nacobbus Aberrans ◽  
Lycopersicon Cheesmanii ◽  
Greenhouse Tests

Accessions of Lycopersicon cheesmanii, L. chmielewskii, L. esculentum var. cerasiforme, L.hirsutum, L. parviflorum, L. peruvianum, L. pennellii, L. pimpinellifolium, and three interspecific hybrids of L. peruvianum with L. esculentum, were screened for resistance to the false root-knot nematode (Nacobbus aberrans) in greenhouse tests. Variability in nematode reproduction levels was observed within L. chmielewskii accessions LA 2695 and LA 2663 in initial tests with N. aberrans from Argentina; however, interspecific hybrids of L. esculentum cv. UC-82 × L. chmielewskii LA 2695, L. esculentum cv. UC-82 × L. chmielewskii LA 2663, and all the parent plants were susceptible in subsequent tests to the isolate of N. aberrans from Argentina and to an isolate from Mexico. The interspecific hybrids that possess the gene Mi and additional novel resistance to Meloidogyne spp. (root-knot nematodes) and all other exotic tomato accessions tested were susceptible to N. aberrans in our tests. Thus, we have been unable to identify or confirm resistance to two N. aberrans isolates in a range of Lycopersicon germ plasm accessions, including those that possess genes for resistance to root-knot nematodes.

scholarly journals Determining of root-knot nematode (Meloidogyne javanica) damage function for tomato cultivars

2013 ◽  
Vol 58 (2) ◽  
pp. 147-157 ◽  
Author(s):  
Fatemeh Gharabadiyan ◽  
Salar Jamali ◽  
Reza Komeili
Keyword(s):  
Maximum Yield ◽  
Meloidogyne Javanica ◽  
Yield Reduction ◽  
Egg Mass ◽  
Initial Population ◽  
Root Knot Nematode ◽  
Effective Population ◽  
Damage Functions ◽  
Resistance Level ◽  
Tomato Cultivars

Root-knot nematode (Meloidogyne javanica) management should be partly based on the knowledge of the threshold density, and this value is likely to vary depending on the resistance level of the tomato cultivars. The damage functions based on four initial population densities (Pi) (0, 1,000, 3,000 and 5,000 egg kg-1 of soil) of root-knot nematode were determined in four tomato cultivars. The experiment was performed in completely randomized design with four replications. The results showed that yield responses to Pi were fitted properly by a log-logistic function with three parameters. The most susceptible cultivar was ?Rutgers? based on EP50 and EP10 (effective population of nematodes, reducing 50% or 10% of maximum yield or shoot fresh weight respectively) and three others were relatively resistant. EP10 is more applicable than EP50 because 50% yield reduction is unacceptable in most situations. EP10 for yield of ?Rutgers?, ?Efialto?, ?Falat 111?, ?Gina VF? was 500, 3,021, 2,998, and 3,000 egg kg-1 of soil, respectively. The correlation coefficients among gall index, egg mass and reproductive factors were positively related. Reproduction factor and root gall indices were greater in ?Rutgers? than in the other cultivars (P?0.05). For ?Gina VF? as a relatively resistant cultivar it seemed that increasing of Pi up to 5,000 or more egg kg-1 soil might break its resistance.

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