Vertical and horizontal distribution of and soil sampling for root lesion nematodes (Pratylenchus neglectus and P. thornei) in South Australia

Taylor, S.; Evans, Melissa L.

doi:10.1071/ap98011

Cited by 26 publications

(10 citation statements)

References 10 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…All populations exceeded the lowest populations that have reduced wheat yields in previous research trials in Oregon (Smiley et al, 2004, 2005a, 2005b; Smiley and Machado, 2009) and internationally (Castillo and Vovlas, 2007). Damage thresholds are not specific and are not generally reported because yield reductions from a specific population density of Pratylenchus varies in response to abiotic environmental factors (Kimpinski et al, 1987; Orion et al, 1984; Castillo and Vovlas, 2007), vertical distribution of the nematodes in soil (Smiley et al, 2008; Taylor and Evans, 1998; Thompson et al, 1999), reproductive fitness of the resident Pratylenchus population (Castillo and Vovlas, 2007), and overall tolerance levels of crop species and cultivars (Hollaway et al, 2000; Thompson et al, 2008b; Vanstone et al, 1998, 2008).…”

Section: Resultsmentioning

confidence: 99%

Root‐Lesion Nematodes Reduce Yield of Intolerant Wheat and Barley

Smiley

2009

Agronomy Journal

View full text Add to dashboard Cite

Root-lesion nematodes (Pratylenchus neglectus and P. thornei) are widely distributed and substantially reduce grain yields in wheat (Triticum aestivum L.)-producing regions of the Pacifi c Northwest (PNW). Th e objective of this research was to determine if wheat and barley (Hordeum vulgare L.) cultivars diff er in tolerance to these nematode species. Field experiments were conducted by comparing yields in untreated and nematicide-treated plots over 3 yr at two locations infested with either P. neglectus or P. thornei. Yield improvements from nematicide application ranged from 9 to 40% for spring cereals and 6 to 17% for winter cereals. Phenotypic tolerance responses diff ered (P < 0.01) among 45 cultivars of spring cereals but not among 22 and 45 cultivars of winter cereals. Tolerance ratings were assigned to spring cereals. Th is is the fi rst report of wheat and barley tolerances to rootlesion nematodes in North America. Variability within data sets was used to estimate that 40 and 56 comparisons (experiments × replications) would be required to assign tolerance ratings at the 95% confi dence interval for spring and winter cereals, respectively. Cultivar reactions in these tests, production and economic statistics for Idaho, Oregon, and Washington, and surveys of Pratylenchus in these states were used to estimate that P. neglectus and P. thornei reduce region-wide yields as much as 5% annually, equaling 361 Gg (361,000 metric tons) valued at $51 million. It was concluded that this yield-based screening procedure was impractical for routine screening but added emphasis to the importance of these root parasites in regions with low precipitation.

show abstract

Section: Resultsmentioning

confidence: 99%

Root‐Lesion Nematodes Reduce Yield of Intolerant Wheat and Barley

Smiley

2009

Agronomy Journal

View full text Add to dashboard Cite

show abstract

“…P. crenatus and P. neglectus are found in a broad range of soil types from heavy clays to sandy soils and these two species occurs more frequently in acid than in neutral or alkaline soils. Vertical distribution of P. crenatus in different soil types was 70 % in the top 22 cm and in P. neglectus 94 % of specimens occur in the upper layers of soil up to 20 cm (Taylor and Evans, 1998) and both species are reported to be pathogenic to cereals crops and are associated with poor growth of cereals plants (Castillo & Vovlas, 2007). Morphological methods can be time-consuming and impractical when rapid results are required.…”

Section: Introductionmentioning

confidence: 99%

Characterization of Pratylenchus crenatus and P. neglectus (Nematoda: Pratylenchidae) associated with wheat crop

Kumari

2015

Helminthologia

View full text Add to dashboard Cite

SummaryThe distribution of Pratylenchus species associated with wheat crops was investigated in Bohemian region of the Czech Republic. In total twelve localities were sampled. The populations were identifi ed based on morphology and morphometrics, and further characterised based on sequences of the rDNA D2/D3 region and 18S gene. Pratylenchus crenatus was present in two localities and P. neglectus in fi ve localities. At one locality both species were detected. Sequence analysis of 18S and D2/D3 region of three populations of P. crenatus reveal no variation while fi ve populations of P. neglectus differ by 0 to 0.14 % (18S) and 0.17 to 0.50 % (D2/D3).

show abstract

“…Pratylenchus penetrans is known to be damaging to onions, causing stunting, particularly at temperatures below 16°C (Ferris 1962(Ferris , 1970Olthof and Potter 1973). Although P. penetrans is present in South Australia, other species especially P. neglectus and P. crenatus are more commonly associated with cereals and potatoes which are important rotational crops in South Australia (Harding and Wicks 2007;Taylor and Evans 1998). There is little information on the effects of these species on onions.…”

Section: Discussionmentioning

confidence: 95%

Onion stunting in South Australia associated with Rhizoctonia solani AG 8

Wicks

Walker

Pederick

et al. 2010

Australasian Plant Pathol.

View full text Add to dashboard Cite

Patches of stunted onion plants are common within otherwise healthy crops in the "Mallee" region of South Australia. A number of fungi including species of Rhizoctonia, Fusarium, Pyrenochaeta and Pythium were isolated from the roots of stunted plants, but only R. solani anastomosis groups (AG) 2.1 and 8 consistently caused severe stunting when onion seedlings were grown in soil inoculated with these pathogens. High quantities of R. solani AG 8 DNA were associated with soil collected from stunted patches but the pathogen was generally low or absent in soil from healthy areas. DNA of AG 2.1 and 3 were common in onion field soil, but quantities were not correlated with stunted areas. AGs 2.2, 4 and 5 were rarely detected in onion field soil. Nematodes such as Pratylenchus, Paratylenchus, Paratrichodorus and Tylenchorhynchus were extracted from soil and/or onion roots but numbers were generally low and were similar in stunted and healthy areas. Overall these results suggest that onion stunting in South Australia is primarily associated with R. solani AG 8 although interactions with other fungi and/or nematodes may also be involved.

show abstract

Vertical and horizontal distribution of and soil sampling for root lesion nematodes (Pratylenchus neglectus and P. thornei) in South Australia

Cited by 26 publications

References 10 publications

Root‐Lesion Nematodes Reduce Yield of Intolerant Wheat and Barley

Root‐Lesion Nematodes Reduce Yield of Intolerant Wheat and Barley

Characterization of Pratylenchus crenatus and P. neglectus (Nematoda: Pratylenchidae) associated with wheat crop

Onion stunting in South Australia associated with Rhizoctonia solani AG 8

Contact Info

Product

Resources

About