Relationship between potato cyst nematodes and their principal host. III. Consistency and accuracy of nematode density — yield descriptors as influenced by seasonal variation

Mulder, A.; Wal, A. F. van der; Velema, R. A. J.

doi:10.1007/bf02358015

Cited by 4 publications

(6 citation statements)

References 7 publications

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“…Our results are consistent with that pattern, with the difference in Russet Burbank yield between years 2013 and 2014 being much greater than the effect of G. ellingtonae in any given year. Although some studies have determined that relative yield loss caused by PCN increases with increasing total yield (Mulder et al, 1997;Phillips et al, 1998), we did not find such a correlation given that the only significant reduction in Russet Burbank yield was seen in the trial with a lower mean yield.…”

Section: Journal Of Nematologycontrasting

confidence: 70%

“…Separate experiments are required to determine those parameters for a new species at a new location, the experimental design for which would require far more inoculum than we were able to generate in the few years since the discovery of G. ellingtonae and the start of our research program with this nematode. Working within the constraints of our inoculum supply, we used mid-range initial nematode densities, shown both to be linearly correlated with yield and to have large negative effects on yield by PCN (Mulder et al, 1997), to determine if similar densities of G. ellingtonae would have a detectable effect. As stated in the introduction, initially G. ellingtonae was found at very low densities (1-7 cysts/2.3 kg soil) across the farm at Powell Butte, OR, with one hotspot being identified with 24 cysts/2.3 kg soil.…”

Section: Discussionmentioning

confidence: 99%

“…Field studies of PCN using the same potato cultivar for multiple years have documented that the rate of yield reduction varies with year, with effects of year sometimes eclipsing effects of Pi (Mulder et al, 1997).…”

Section: Journal Of Nematologymentioning

confidence: 99%

“…To test for a relationship between Pi and tuber yield and Pi and aboveground biomass, linear regression with log 10 transformed Pi (x + 1) was performed in concordance with the relationship between Pi and yield proposed by Oostenbrink (1966); data were combined from the trials for linear regressions. Although various models have been proposed to describe the relationship between Pi and yield for PCN, the loglinear equation of Oostenbrink (1966) was used as it is simpler, does not require estimation of unknown parameters such as minimum yield and damage threshold, and has been determined to fit as well or better than other proposed relationships at mid-range Pi (Mulder et al, 1997). Host status and reproductive ability were measured by eggs/cyst, final density of eggs/g soil (Pf), and reproduction factor (RF) calculated as Pf/Pi, with differences tested by two-way ANOVA and Tukey's HSD.…”

Section: Journal Of Nematologymentioning

confidence: 99%

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Impact of Globodera ellingtonae on yield of potato (Solanum tuberosum)

Zasada

Ingham

Baker

et al. 2019

Journal of Nematology

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Globodera ellingtonae was described from Oregon and Idaho in 2012. Due to the close phylogenetic relationship of this nematode to the potato cyst nematodes G. pallida and G. rostochiensis, and evidence that G. ellingtonae reproduces on potato (Solanum tuberosum), potential damaging effects to potato by this nematode are of great concern. To evaluate the pathogenic effects of G. ellingtonae on potato, five field and two microplot trials were conducted over a four-year period including comparisons of a range of G. ellingtonae initial population densities (Pi) and potato cultivars. In two field trials, potato 'Russet Burbank' was inoculated with Pi of G. ellingtonae ranging from 0 to 80 eggs/g soil; a similar trial was conducted with potato 'Désirée.' In another field trial, potato cultivars varying in maturity lengths were either inoculated (80 eggs/g soil) or not with G. ellingtonae. In a final field trial, 'Ranger Russet' was inoculated with Pi of G. ellingtonae ranging from 0 to 360 eggs/g soil. Additionally, Russet Burbank was inoculated with G. ellingtonae Pi ranging from 0 to 169 eggs/g soil in microplots. In all trials, data on tuber yield, aboveground biomass, final eggs/cyst, final population densities (Pf), and reproduction factor (RF = Pf/Pi) were collected. In only two of six trials conducted with increasing levels of Pi, was there a significant negative correlation between Pi of G. ellingtonae and yield of potato. Based on the linear regression model of tuber yield on logPi for Russet Burbank, 30.5 to 40.9% yield loss was predicted at a Pi of 40 and 80 eggs/g soil, respectively, and for Ranger Russet, 16.5 and 19.7% yield loss was predicted at a Pi of 40 and 80 eggs/g soil, respectively. None of the potato cultivars inoculated with 80 G. ellingtonae eggs/g soil had significantly reduced yields compared to non-inoculated plants. Reproduction factor values across trials ranged from 4.0 to 8.3 when inoculated with Pi of 40 eggs/g soil, demonstrating that the nematode successfully invaded and reproduced on potato in all trials. Care should be taken in extrapolating the results from these experiments conducted in Oregon to probable effects of G. ellingtonae on potato in other environments.

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Section: Journal Of Nematologycontrasting

confidence: 70%

Section: Discussionmentioning

confidence: 99%

Section: Journal Of Nematologymentioning

confidence: 99%

Section: Journal Of Nematologymentioning

confidence: 99%

See 2 more Smart Citations

Impact of Globodera ellingtonae on yield of potato (Solanum tuberosum)

Zasada

Ingham

Baker

et al. 2019

Journal of Nematology

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“…This, combined with an average precipitation of some 400 mm during the growing season (cf. Mulder et al, 1997, Table 2). means that the potato crop on field S1 had the equivalent of 9(1 mm less water than the crops on the other fields during the growing season.…”

Section: Discussionmentioning

confidence: 93%

Effects of soil characteristics on the relationship between potato cyst nematodes and yield. I. Water retention

Mulder¹,

Wal

Velema³

1997

Potato Res

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SummaryData from five long-term field experiments on sandy and sandy peat soils were analyzed for the effect of soil type on damage caused by potato cyst nematodes to potato crops. It was shown that the water retention of the topsoil and the subsoil largely determined the potential yield level in the different fields. According to Oostenbrink's equation the slopes of the curves are steeper with increasing yield level, indicating that the higher the potential yield level, the higher the absolute yield loss. However, when yield was expressed as percentage of maximum yield, yield reduction related to potato cyst nematode density did not differ significantly, except when tolerant cultivars were grown. Increasing tolerance of cultivars to nematode damage was reflected in less steep slopes of the yield/nematode density curves.

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Economic Impact from Unrestricted Spread of Potato Cyst Nematodes in Australia

Hodda¹,

Cook²

2009

Phytopathology®

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Potato cyst nematodes (PCN) (Globodera spp.) are quarantine pests with serious potential economic consequences. Recent new detections in Australia, Canada, and the United States have focussed attention on the consequences of spread and economic justifications for alternative responses. Here, a full assessment of the economic impact of PCN spread from a small initial incursion is presented. Models linking spread, population growth, and economic impact are combined to estimate costs of spread without restriction in Australia. Because the characteristics of the Australian PCN populations are currently unknown, the known ranges of parameters were used to obtain cost scenarios, an approach which makes the model predictions applicable generally. Our analysis indicates that mean annual costs associated with spread of PCN would increase rapidly initially, associated with increased testing. Costs would then increase more slowly to peak at over AUD$20 million per year approximately 10 years into the future. Afterward, this annual cost would decrease slightly due to discounting factors. Mean annual costs over 20 years were $18.7 million, with a 90% confidence interval between AUD$11.9 million and AUD$27.0 million. Thus, cumulative losses to Australian agriculture over 20 years may exceed $370 million without action to prevent spread of PCN and entry to new areas.

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Relationship between potato cyst nematodes and their principal host. III. Consistency and accuracy of nematode density — yield descriptors as influenced by seasonal variation

Cited by 4 publications

References 7 publications

Impact of Globodera ellingtonae on yield of potato (Solanum tuberosum)

Impact of Globodera ellingtonae on yield of potato (Solanum tuberosum)

Effects of soil characteristics on the relationship between potato cyst nematodes and yield. I. Water retention

Economic Impact from Unrestricted Spread of Potato Cyst Nematodes in Australia

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