Host-status of thirty-two maize genotypes to Meloidogyne incognita race 2 and Meloidogyne javanica in South Africa

2012 ◽  
Vol 7 (12) ◽  
Author(s):  
G. L. Ngobeni
Keyword(s):  
South Africa ◽  
Meloidogyne Incognita ◽  
Meloidogyne Javanica ◽  
Maize Genotypes ◽  
Host Status ◽  
Race 2

scholarly journals Heritability of Root-knot Nematode (Meloidogyne spp.) Resistance in Sweetpotatoes

HortScience ◽  
1996 ◽  
Vol 31 (4) ◽  
pp. 622a-622 ◽  
Author(s):  
W. R. Maluf ◽  
S. M. Azevedo ◽  
V.P. Campos
Keyword(s):  
Meloidogyne Incognita ◽  
Meloidogyne Javanica ◽  
Broad Sense Heritability ◽  
Root Knot Nematode ◽  
Egg Masses ◽  
Substrate Removal ◽  
Meloidogyne Spp ◽  
Diverse Origin ◽  
Race 2 ◽  
Resistant Genotypes

Heritabilities for resistance to root knot nematodes (Meloidogyne javanica and Meloidogyne incognita races 1, 2, 3, and 4) were studied in a population of 226 sweetpotato clones of diverse origin. For each nematode isolate tested, 128-cell speedling trays were filled with previously inoculated substrate (30000 eggs/1000 mL substrate). Sweetpotato clones suitably tagged and identified were randomly planted in the cells (one plant/cell), with a total of four plants per clone per isolate. Ninety days after inoculation, sweetpotato plants had their roots washed for substrate removal, and treated with 150 mg·L–1 Phloxine B to stain nematode egg masses. The number of egg masses per root was recorded, and plants were accordingly assigned scores from 0 (highly resistant) to 5 (highly susceptible). Broad-sense heritability estimates were 0.87, 0.91, 0.81, 0.95, and 0.93 respectively for resistance to M. javanica and races 1, 2, 3, and 4 of M. incognita. The frequencies of resistant genotypes were higher for M. javanica and lower for M. incognita race 2. Genotypic correlations (rG) among the resistances to the various Meloidogyne isolates utilized were weak, ranging from 0.11 to 0.57, suggesting independent genetic controls. Clones could be selected, however, with high levels of resistance to all nematode isolates tested. (This work was supported by CNPq, CAPES, FAPEMIG, and FAEPE/UFLA.)

scholarly journals Host status of progenies of yellow passion fruit to Meloidogyne incognita race 2

2016 ◽  
Vol 16 (2) ◽  
pp. 153-157
Author(s):  
Roxana Stefane Mendes Nascimento ◽  
Everaldo Antônio Lopes ◽  
Carlos Eduardo Magalhães dos Santos ◽  
Viviane Manuela Bernardes Silva Magalhães ◽  
José Avelino Cardoso
Keyword(s):  
Meloidogyne Incognita ◽  
Passion Fruit ◽  
Host Status ◽  
Race 2 ◽  
Yellow Passion Fruit

scholarly journals Nematóides associados a plantas invasoras

1976 ◽  
Vol 33 (0) ◽  
pp. 597-615 ◽  
Author(s):  
Antonio Carlos Zem ◽  
Luiz Gonzaga E. Lordello
Keyword(s):  
Meloidogyne Incognita ◽  
Meloidogyne Javanica ◽  
Meloidogyne Arenaria ◽  
Pratylenchus Brachyurus ◽  
Pratylenchus Zeae

O presente trabalho trata de nematóides associados a raízes de 71 plantas invasoras, nas quais revelou-se a presença de 8 gêneros e 18 espécies parasitas. As espécies, pela ordem decrescente de freqüência foram: Helicotylenchus dihystera (46%) ; Meloidogyne javanica (24%) ; Meloidogyne incognita (23%); Macroposthonia ornata (17%); Pratylenchus brachyurus (16%) ; Pratylenchus zeae (14%) ; Xiphinemaseiariae (11%); Xiphinema krugi (10%); Helicotylenchus pseudorobustus (5,6%); Meloidogyne arenaria (4,2%); Helicotylenchus dUiysteroides (4,2%) ; Tylenchorhynchus martini (4,2%) ; Aphelenchoides sp. (2,8%) ; Ditylenchus sp. (2,8%) ; Helicotylerfichus microcephalus (2,8%) ; Xiphinema elongatum (2,8%) ; Helicotylenchus egyptiensis (1,4%) e Meloidogyne coffeicola (1,4%). São feitas considerações sobre as implicações para a agricultura de tão ampla distribuição de nematóides em plantas colonizadoras e gramíneas utilizadas como forrageiras.

Invasion, development, growth and egg laying by Meloidogyne javanica in Brassicaceae crops

Nematology ◽  
2001 ◽  
Vol 3 (5) ◽  
pp. 463-472 ◽  
Author(s):  
John Kirkegaard ◽  
Rod McLeod ◽  
Christopher Steel
Keyword(s):  
Intermediate Host ◽  
Subterranean Clover ◽  
Meloidogyne Javanica ◽  
Mature Female ◽  
Egg Laying ◽  
Field Pea ◽  
Crop Species ◽  
Egg Masses ◽  
Brassicaceae Species ◽  
Host Status

AbstractInvasion, development and egg laying by Meloidogyne javanica in 11 Brassicaceae and four non-Brassicaceae crop species/subspecies was investigated. At 10 to15 and 15 to 20°C, fodder rape cv. Rangi was invaded less than the good hosts tomato cv. Grosse Lisse and field pea cv. Dun but more than the poor host oat cv. Cooba. With an inoculum of 50 second stage juveniles (J2), invasion of Rangi, and the intermediate host subterranean clover cv. Trikkala, were similarly invaded when inoculated with 50 and 100 J2, cv. Rangi was invaded less than tomato. The intermediate host subterranean clover cv. Trikkala and Rangi were similarly invaded when inoculated with 50 and 100 J2 but cv. Trikkala was less invaded with 200 J2. Oat cv. Cooba was always less invaded than the other hosts. Invasion of 3-week-old seedlings of cv. Rangi and 12 cultivars of seven other Brassicaceae crop species/subspecies were similar. Three weeks after inoculation, more M. javanica had developed to the mature female stage in tomato than in the eight Brassicaceae species/subspecies. Females growing in tomato and field pea were always larger than those in rape cv. Rangi. Females in Rangi were larger but those in oilseed radish cv. Adagio were smaller than in 11 other cultivars of seven Brassicaceae, except in plants grown in winter. Egg masses from four Brassicaceae species contained fewer eggs than egg masses from tomato at 6 weeks after inoculation, but at 7 and 8 weeks only those from fodder rape cv. Korina had consistently fewer than tomato. Results are discussed in relation to host status, glucosinolates and potential use of Brassicaceae for control of Meloidogyne.

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