Quantifying the aggressiveness, temporal and spatial spread of &lt;i&gt;Pantoea stewartii &lt;/i&gt; in sweet corn

Liu, Lu

doi:10.31274/etd-180810-204

Cited by 1 publication

(3 citation statements)

References 23 publications

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“…where C is a cumulative probability of p, n 1 and n 2 are the sample sizes at the first and second inspection, p is incidence at the first inspection and k is the factor by which incidence has increased from the first to the second inspection. Liu (2010) investigated an epidemic of P. s. subsp. stewartii in maize in a field experiment in Iowa in 2007.…”

Section: 1mentioning

confidence: 99%

“…Incidence increased by a factor 2–4 from day 160–190 to day 230. Judging from the graphs (Figure ), seed treatment with Cruiser appears to affect the rate of spread, but Liu () reports that the difference in rate of increase was not significant.…”

Section: Entry Assessmentmentioning

confidence: 99%

“…Development of an epidemic of Stewart's wilt in seed‐treated vs. non‐seed‐treated maize fields (from Liu, ; courtesy of Plant Pathology Commons, http://network.bepress.com/about/life-sciences/plant-sciences/plant-pathology/)…”

Section: Entry Assessmentmentioning

confidence: 99%

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Risk assessment of the entry of Pantoea stewartii subsp. stewartii on maize seed imported by the EU from the USA

Bragard¹,

Dehnen‐Schmutz²,

Serio³

et al. 2019

EFS2

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Following a request from the European Commission, the EFSA Panel on Plant Health performed a risk assessment of the entry of Pantoea stewartii subsp. stewartii on maize seed imported by the EU from the USA. This pest is a Gram-negative bacterium which causes Stewart's vascular wilt and leaf blight of maize (including sweet corn), a disease responsible for serious crop losses throughout the world. The following scenarios were considered: scenario A0 (current practice), scenario A1 (US request for modification of EU conditions for derogation), and scenario A2 (EU conditions for derogation). Results from the quantitative seed pathway model presented here show that, despite the low rates of plant-to-seed and seed-toseedling transmission that have been reported in the literature for Stewart's wilt, given the amount of traded seed, and in the case of voluntary (i.e. not mandatory) inspections of seed production fields at the origin (i.e. scenario A0), the frequency of introducing the disease is in the order of magnitude of some hundred introductions per year (median number). The EU conditions for derogation would lead to a decrease in the likelihood of entry compared to scenarios A0 (about 10,000 times fewer introductions) and A1 (about 2,000 times fewer introductions). This protective effect is mainly due to the requirement that only genotypes resistant to Stewart's wilt are traded, with the additional field inspection (two instead of one per season) providing additional reassurance. The Panel also concluded that seed lot inspections, as currently carried out (e.g. with a sample of 400 seeds) are not likely to lead to a relevant reduction in the level of infected imported maize seed, given the low prevalence of Stewart's wilt at the origin. If, however, there is aggregation in infection among consignments, inspection would work towards identifying the highly infected consignments. Recently, outbreaks of Stewart's wilt have occurred in Italy (Emilia Romagna, Friuli, Lombardy and Veneto). A review is provided of the available information to assess the possible role of seed imports in these outbreaks.

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Section: 1mentioning

confidence: 99%

Section: Entry Assessmentmentioning

confidence: 99%