Yield of maize as influenced by population densities of the root lesion nematode,Pratylenchus zeae

2013 ◽  
Vol 46 (4) ◽  
pp. 483-486 ◽  
Author(s):  
M.M.A. Youssef
Keyword(s):  
Root Lesion Nematode ◽  
Population Densities ◽  
Lesion Nematode ◽  
Pratylenchus Zeae

Pathogenicity of the root-lesion nematode, Pratylenchus zeae, on rice genotypes under different hydro-ecologies in Tanzania

Nematology ◽  
2020 ◽  
Vol 22 (2) ◽  
pp. 221-233 ◽  
Author(s):  
Yasinta Beda Nzogela ◽  
Sofie Landschoot ◽  
Ashura-Luzi Kihupi ◽  
Danny L. Coyne ◽  
Godelieve Gheysen
Keyword(s):  
Upland Rice ◽  
Growth And Yield ◽  
Post Inoculation ◽  
Root Lesion Nematode ◽  
Rice Genotypes ◽  
Lesion Nematode ◽  
The Impact ◽  
Mixed Stage ◽  
Pratylenchus Zeae ◽  
Better Than

Summary The root-lesion nematode, Pratylenchus zeae, is commonly found in upland rice fields. To measure the impact of the nematode on rice production, a screenhouse experiment was conducted using two farmer-adapted Oryza sativa cultivars, ‘Supa’ (‘SurinamV-880’) and ‘SARO-5’ (‘TXD 306’), under flooded, upland and drought water regimes imposed at 7 days post-inoculation of mixed-stage nematodes (200, 500, 1000, 3000 and 10 000 plant−1). Growth and yield parameters were recorded, and the experiment was terminated after 5 months. ‘Supa’ was shown to be resistant to P. zeae, while ‘SARO-5’ was susceptible. Pratylenchus zeae reduced the growth and yield of both cultivars, though more for ‘SARO-5’ than for ‘Supa’. Yield decreased with increasing final nematode densities. Pratylenchus zeae reproduction was highest at 200 and 500 inoculum levels and under upland water conditions. The yield of ‘SARO-5’ was greater than that of ‘Supa’ under flooded conditions and with no or 200 and 500 nematode inoculum levels, but with high P. zeae inoculum ‘Supa’ yield was better than ‘SARO-5’.

scholarly journals Reproduction of Pratylenchus zeae on Weeds

2017 ◽  
Vol 35 (0) ◽  
Author(s):  
C. BELLÉ ◽  
T.E. KASPARY ◽  
P.R. KUHN ◽  
J. SCHMITT ◽  
I. LIMA-MEDINA
Keyword(s):  
Initial Population ◽  
Root Lesion Nematode ◽  
Brachiaria Decumbens ◽  
Final Population ◽  
Weed Plants ◽  
Lesion Nematode ◽  
Pratylenchus Zeae ◽  
Reproduction Factor

ABSTRACT Weeds can be hosts of root-lesion nematode (Pratylenchus spp.), maintaining or increasing their population in the soil. The objective of this study was to evaluate the reaction of 25 weeds species to the nematode Pratylenchus zeae. The weed plants were individually inoculated with 1,000 individuals of P. zeae and maintained in a greenhouse for 90 days. After this period, eggs and nematodes were extracted, quantified, and the reproduction factor (RF = final population/initial population) was calculated. All tested weeds were susceptible (RF>1) to P. zeae, and the species Brachiaria decumbens, Rhynchelytrum repens, Digitaria insularis, D. horizontalis, B. brizantha were the most susceptible to this parasite.

CONTROL OF THE ROOT-LESION NEMATODE (PRATYLENCHUS PENETRANS) IN FLUE-CURED TOBACCO IN ONTARIO

1975 ◽  
Vol 55 (1) ◽  
pp. 309-314 ◽  
Author(s):  
C. F. MARKS ◽  
J. M. ELLIOT
Keyword(s):  
Field Experiments ◽  
Weather Conditions ◽  
Growing Season ◽  
Relative Efficacy ◽  
Pratylenchus Penetrans ◽  
Root Lesion Nematode ◽  
Population Densities ◽  
Nicotiana Tabacum L ◽  
Degree Of Control ◽  
Lesion Nematode

Field experiments were conducted on Fox loamy sand to determine the relative efficacy of certain fumigant and non-fumigant nematicides against Pratylenchus penetrans in flue-cured tobacco (Nicotiana tabacum L.). Control of nematodes in the soil shortly after transplanting was better with the fumigants than with the non-fumigant nematicides, but the degree of control in the roots was about the same. Initial nematode population densities in the soil were similar in 1971 and 1972, but the crop responded to nematicide treatments only in 1972. The response differences were attributed mainly to weather conditions. It was not possible to relate final yields of flue-cured tobacco to degree of control of P. penetrans in either the soil or the roots at any one time during the growing season.

scholarly journals Post-Plant Nematicides for the Control of Root Lesion Nematode in Red Raspberry

2010 ◽  
Vol 20 (5) ◽  
pp. 856-862 ◽  
Author(s):  
Inga A. Zasada ◽  
Thomas W. Walters ◽  
John N. Pinkerton
Keyword(s):  
Foliar Application ◽  
Rubus Idaeus ◽  
Infested Soil ◽  
Pratylenchus Penetrans ◽  
Root Lesion Nematode ◽  
Red Raspberry ◽  
Population Densities ◽  
Quillaja Saponaria ◽  
Lesion Nematode ◽  
Sampling Times

To identify a post-plant nematicide to control root lesion nematode [RLN (Pratylenchus penetrans)] in red raspberry (Rubus idaeus), a number of nematicides was tested in soil-only and plant-based experiments. In soil-only experiments, soil naturally infested with RLN was drenched with the nematicides and nematode survival was assessed 7 and 14 days after treatment. Fosthiazate and oxamyl reduced RLN recovery 92% and 52% across trials and sampling times, respectively, compared with the nontreated control. Other nematicides that resulted in moderate, and sometimes inconsistent, control of RLN were soapbark (Quillaja saponaria) saponins, 1,3-dichloropropene, and methomyl. In plant-based experiments, ‘Meeker’ red raspberry was established in pots with RLN-infested soil mixed with greenhouse soil and the nematicides were applied as soil drenches or as a foliar application. Nematode recovery and cane and root weights were quantified as measurements of nematicide toxicity and phytotoxicity, respectively. Similar to soil-only experiments, fosthiazate and oxamyl were the most effective nematicides tested in reducing RLN population densities in established red raspberry. Fosthiazate and oxamyl significantly reduced RLN per gram dry root population densities by 97% and 87%, respectively, compared with the infested, nontreated control. None of the other nematicides reduced RLN population densities compared with the infested, nontreated controls. There was no phytotoxicity to red raspberry associated with any of the nematicides.

Impact of the root-lesion nematode Pratylenchus goodeyi and mulch on the East African Highland banana crop performance in Kibuye, Western Rwanda

Nematology ◽  
2010 ◽  
Vol 12 (3) ◽  
pp. 349-356
Author(s):  
Svetlana Gaidashova ◽  
Dirk De Waele ◽  
Carine Dochez ◽  
Bruno Delvaux ◽  
Piet van Asten
Keyword(s):  
Plant Growth ◽  
Root Lesion Nematode ◽  
East African ◽  
Population Densities ◽  
Root Necrosis ◽  
Crop Performance ◽  
Lesion Nematode ◽  
The Impact ◽  
Banana Crop ◽  
Pratylenchus Goodeyi

AbstractThe effect of nematode root injuries on banana crop yield is very poorly known in higher parts of the East African highlands. This study assessed the impact of the root-lesion nematode, Pratylenchus goodeyi, on growth and yield of three banana cultivars (Musa spp. AAA-EA) in a field experiment involving nematicide and mulch applications at conditions of high altitude (about 1500 m). Plant growth, yield, root damage and nematode population densities were observed over three production cycles. Low to medium levels (≤50%) of root necrosis were associated with improved plant growth, whilst higher root necrosis (>50%) had no effect on plant growth. No significant reduction in bunch weight was associated with high root necrosis in any cycle and any of the three cultivars. Mulch significantly reduced root necrosis and P. goodeyi population densities. Bunch weight significantly increased in all mulched plots irrespective of root necrosis intensity. These results agree with those of earlier surveys in Rwanda that suggested little impact of P. goodeyi on banana yields. However, they challenge general perceptions and previous findings on the negative impact of root lesion nematodes on banana crop performance.

scholarly journals Invasion and reproduction of Pratylenchus penetrans in birdsfoot trefoil cultivars

2005 ◽  
Vol 80 (3) ◽  
pp. 179-184 ◽  
Author(s):  
J. Kimpinski ◽  
Y.A. Papadopoulos ◽  
B.R. Christie ◽  
K.B. McRae ◽  
C.E. Gallant
Keyword(s):  
Genetic Variability ◽  
Lotus Corniculatus ◽  
Birdsfoot Trefoil ◽  
Pratylenchus Penetrans ◽  
Root Lesion Nematode ◽  
Population Densities ◽  
Lesion Nematodes ◽  
Lesion Nematode ◽  
Root Lesion Nematodes ◽  
Screening Trial

Greenhouse trials were conducted to determine the levels of invasion of birdsfoot trefoil(Lotus corniculatus) cultivars and lines by the root-lesion nematode (Pratylenchuspenetrans). Numbersof nematodesin roots grown in 50-cm3 polystyrene starter pots were determined 6 weeks after planting. Nematodes were detected in the roots of all cultivars and lines, though the degree of invasion varied significantly. In the first screening trial, carried out in 1994 on 23 cultivars and lines, NB90-104, Upstart, and Viking harbored the lowest population densities of nematodes with levels below 1 000 g-1 of dry root, while Fergus and EPF had population densities over 30 000 g-1 of dry root. In the second screening trial conducted in 1995, all nine cultivars and lines tested, including NB90-104, Upstart, and Viking, had nematode levels greater than 7 900 g-1 of dry root. The results indicated that the cultivars and lines tested in this study exhibited wide genetic variability for invasion by root-lesion nematodes.

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