scholarly journals Association analysis of resistance to cereal cyst nematodes (Heterodera avenae) and root lesion nematodes (Pratylenchus neglectus and P. thornei) in CIMMYT advanced spring wheat lines for semi-arid conditions

2016 ◽  
Vol 66 (5) ◽  
pp. 692-702 ◽  
Author(s):  
Abdelfattah A. Dababat ◽  
Gomez-Becerra Hugo Ferney ◽  
Gul Erginbas-Orakci ◽  
Susanne Dreisigacker ◽  
Mustafa Imren ◽  
...  
Keyword(s):  
Association Analysis ◽  
Spring Wheat ◽  
Heterodera Avenae ◽  
Cyst Nematodes ◽  
Pratylenchus Neglectus ◽  
Arid Conditions ◽  
Lesion Nematodes ◽  
Root Lesion Nematodes ◽  
Wheat Lines ◽  
Semi Arid

scholarly journals Efficacy Evaluation of Seed-Coating Compounds Against Cereal Cyst Nematodes and Root Lesion Nematodes on Wheat

Plant Disease ◽  
2017 ◽  
Vol 101 (3) ◽  
pp. 428-433 ◽  
Author(s):  
Jiang-Kuan Cui ◽  
Wen-Kun Huang ◽  
Huan Peng ◽  
Yan Lv ◽  
Ling-An Kong ◽  
...  
Keyword(s):  
The Other ◽  
Heterodera Avenae ◽  
Growth Stages ◽  
Nematode Control ◽  
Cyst Nematodes ◽  
Efficacy Evaluation ◽  
Lesion Nematodes ◽  
Chemical Products ◽  
Root Lesion Nematodes ◽  
Different Growth Stages

Cereal cyst nematodes (Heterodera avenae and H. filipjevi) and root lesion nematodes (Pratylenchus spp.) have been found to infect cereals in 16 provinces of China. To develop a nematicide that effectively controls nematodes, two novel chemical products, methylene bis thiocyanate (MBT) and MBT + thiamethoxam (MTT); four common pesticides, fipronil + chlorpyrifos (FIC), emamectin benzoate, imidacloprid, and Bacillus thuringiensis; and one fungicide, iprodione, were tested as seed coatings for the control of cereal cysts and root lesion nematodes from 2013 to 2015. Wheat seeds were treated with these seven seed coatings before sowing, and changes in the numbers of Heterodera spp. and Pratylenchus spp. were recorded during three different growth stages. Wheat yields were also compared after harvest. All treatments reduced the numbers of Pratylenchus in wheat and of cysts and eggs of Heterodera in the soil compared with the untreated control. Among the treatments, application of MTT or FIC was more effective than that of the other treatments for nematode control, and the other treatments had similar effects. The results of this study have demonstrated that MTT and FIC applied as seed treatments effectively reduce the number of cysts, inhibit the reproduction of Heterodera and Pratylenchus, and enhance wheat yields. MTT and FIC are thus suitable for controlling nematodes on wheat under natural field conditions.

Pratylenchus penetrans and P. neglectus in tubers of potato (Solanum tuberosum) in Ontario

1991 ◽  
Vol 71 (4) ◽  
pp. 1251-1256 ◽  
Author(s):  
Th. H. A. Olthof ◽  
M. S. Wolynetz
Keyword(s):  
Solanum Tuberosum ◽  
Inner Core ◽  
Pratylenchus Penetrans ◽  
Potato Tubers ◽  
Population Densities ◽  
Pratylenchus Neglectus ◽  
Lesion Nematodes ◽  
Cold Room ◽  
Mist Chamber ◽  
Root Lesion Nematodes

Root-lesion nematodes (Pratylenchus penetrans) were extracted from peels of potato tubers (Solanum tuberosum 'Russet Burbank'). The average number of P. penetrans recovered over a 2-wk period in a mist chamber from four batches of tubers, stored for 3–18 wk at 7 °C in a cold room, ranged from 11 to 1925 nematodes tuber−1. An average of 374 Pratylenchus neglectus tuber−1 were recovered from the peels of potato Norchip, grown in soil containing on average 4370 nematodes kg−1 of soil at harvest, and stored for 19 wk at 7 °C. P. penetrans and P. neglectus were recovered only from the outer layer of potato tubers; none was found in the inner core. Planting halves of tubers containing an average of 1925 P. penetrans tuber−1 into nematode-free soil resulted in soil population densities of 2225 P. penetrans kg−1 of soil and root population densities of 884 nematodes root system−1 after 8 wk in the greenhouse. Although many, if not most, potato fields in southern Ontario are already infested by P. penetrans, these studies have shown that stored, infested tubers can initiate a new infestation. Key words: Peel, potato tuber, Pratylenchus neglectus, Pratylenchus penetrans, root-lesion nematode, Solanum tuberosum

Uptake of nitrogen from high C-to-N ratio, 15N-labeled organic residues by spring wheat grown under semi-arid conditions

1986 ◽  
Vol 18 (3) ◽  
pp. 303-307 ◽  
Author(s):  
N.G. Seligman ◽  
Sala Feigenbaum ◽  
Dvora Feinerman ◽  
R.W. Benjamin
Keyword(s):  
Spring Wheat ◽  
Organic Residues ◽  
Arid Conditions ◽  
Semi Arid

POPULATION DENSITIES OF FOUR SPECIES OF ROOT-LESION NEMATODES (Pratylenchus) IN THE OAT CULTIVARS, SAIA AND OAC WOODSTOCK

1989 ◽  
Vol 69 (3) ◽  
pp. 903-905 ◽  
Author(s):  
J. L. TOWNSHEND
Keyword(s):  
Population Density ◽  
Avena Sativa ◽  
Pratylenchus Penetrans ◽  
Population Densities ◽  
Pratylenchus Neglectus ◽  
Lesion Nematodes ◽  
Oat Cultivars ◽  
Root Lesion Nematodes

The population densities of four species of root-lesion nematodes (Pratylenchus) were examined in two cultivars of oat (Avena sativa L.) grown in greenhouse pots. The cultivar Saia harbored fewer P. neglectus and P. penetrans than the cultivar OAC Woodstock, while both cultivars were similar hosts for P. sensillatus. Pratylenchus crenatus did not develop in either cultivar.Key words: Oat, population density, Pratylenchus crenatus, Pratylenchus neglectus, Pratylenchus penetrans, Pratylenchus sensillatus

Relationship between root lesion nematodes (Pratylenchus neglectus and P. thornei) and performance of wheat varieties

1998 ◽  
Vol 38 (2) ◽  
pp. 181 ◽  
Author(s):  
V. A. Vanstone ◽  
A. J. Rathjen ◽  
A. H. Ware ◽  
R. D. Wheeler
Keyword(s):  
Wheat Yield ◽  
South Australia ◽  
Nematode Species ◽  
Significant Negative Correlation ◽  
Limiting Factors ◽  
Wheat Varieties ◽  
Pratylenchus Neglectus ◽  
Lesion Nematodes ◽  
Root Lesion Nematodes ◽  
The Relationship

Summary. The root lesion nematodes Pratylenchus neglectus andP. thornei occur throughout the cereal cropping areas of South Australia. In 1996, field trials on the Eyre Peninsula of South Australia were assessed to determine the relationship between density of nematodes within field plots in early October and harvested grain yield of 9 wheat varieties. The Pratylenchus species present was either P. neglectus (at Streaky Bay, Minnipa and Kalanbi) or P. thornei (at Nunjikompita). Absence of other major yield limiting factors at these sites in 1996 enabled determination of the relationship between nematode population and wheat yield. There was a significant, negative correlation between mean yield and nematode populations for the 9 varieties at 3 of the sites (P<0.01 for Streaky Bay and Nunjikompita; P<0.05 for Minnipa). Root lesion nematodes were responsible for 56–74% of the observed varietal differences in yield at these sites. The tolerant variety Excalibur yielded 19% (Streaky Bay), 23% (Minnipa) or 33% (Nunjikompita) more than the intolerant variety Spear, and Excalibur resulted in 69, 63 or 66% fewer nematodes, respectively, than in plots of Spear. Although nematode populations could not be assessed at the Kalanbi site, varietal yield relations were similar to the other sites, with Excalibur yielding 18% more than Spear. The 9 varieties were ranked for both resistance and tolerance to the 2 nematode species.

scholarly journals PLANT-PARASITIC NEMATODES ASSOCIATED WITH WALNUT IN THE SANANDEJ REGION OF WEST IRAN

2013 ◽  
Vol 53 (4) ◽  
pp. 404-408 ◽  
Author(s):  
Jebraeil Bahmani ◽  
Farhad Khozeini ◽  
Shapour Barooti ◽  
Saeed Rezaee ◽  
Reza Ghaderi
Keyword(s):  
Meloidogyne Incognita ◽  
Parasitic Nematodes ◽  
Routine Laboratory ◽  
Plant Parasitic Nematodes ◽  
Pratylenchus Neglectus ◽  
Pratylenchus Vulnus ◽  
Time Period ◽  
Lesion Nematodes ◽  
Root Lesion Nematodes ◽  
Plant Parasitic

Abstract A survey of plant-parasitic nematodes associated with walnut was carried out in the Sanandej region, of the province of Kurdistan, in western Iran, during the 2011-2012 time period. After taking samples from fifty-four localities and then doing the routine laboratory work for processing, fixing, and mounting of the nematodes, twenty-one species of plant-parasitic nematodes were finally identified. Among the identified species: Cacopaurus pestis, Mesocriconema xenoplax, Pratylenchus vulnus and Meloidogyne incognita are likely to cause damage. Spiral (Helicotylenchus crassatus, H. digonicus, H. pseudorobustus and H. vulgaris), ring (Mesocriconema antipolitanum and M. xenoplax) and root-lesion nematodes (Pratylenchus neglectus, P. thornei, P. vulnus and P. delattrei) were the most predominant nematodes in the sampled area (frequencies in soil were 87.0, 77.8, and 72.2% and 46.3, 20.4 and 14.8% in root samples, respectively). In the present study, Pratylenchus delattrei, Trophurus lomus, Paratylenchus similis, Geocenamus stegus, Helicotylenchus crassatus, Scutellonema brachyurus and Meloidogyne incognita were reported as new species associated with walnut in Iran.

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