Association of Soil Chemical and Physical Properties with <i>Pythium</i> Species Diversity, Community Composition, and Disease Incidence

Broders, Kirk; Wallhead, Matthew; Austin, G. D.; Lipps, P. E.; Paul, Pierce A.; Mullen, R. W.; Dorrance, Anne E.

doi:10.1094/phyto-99-8-0957

Cited by 82 publications

(34 citation statements)

References 37 publications

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“…population densities between the soils but there may be differences in species composition that could have led to these soil response differences. Broders et al (6) reported that Pythium spp. richness and abundance varied among the 88 locations sampled.…”

Section: Discussionmentioning

confidence: 99%

Effect of Fungicide Seed Treatments, Cultivars, and Soils on Soybean Stand Establishment

2013

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Urrea, K., Rupe, J. C, and Rothrock, C. S. 2013. Effect of fungicide seed treatments, cultivars, and soils on soybean stand establishment. Plant Dis. 97:807-812.Seedling diseases are one of the major production problems for soybean. The pdmary control of soybean seedling diseases is by fungicide seed treatments but compadsons of seed treatments are difficult because stand responses are often erratic in the field. The objective of this study was to determine the efficacy of soybean fungicide seed treatments in naturally infested soils under controlled environments at three temperatures. Seed of three soybean cultivars were treated with six fungicide treatments or not treated and planted in two soil types collected from two fields in Apdl, May, and June 2008 and 2009. Tests were conducted in growth chambers at 21°C (Apdl planting), 25°C (May planting), or 28°C (June planting). Stands were determined when at least 25% of the seedlings reached the V4 growth stage. Seed treatments improved stands at all three temperatures, in both soils, and in both years. In general, the broad-spectrum fungicides tdfloxystrobin + metalaxyl and mefenoxam + fludioxonil + azoxystrobin resulted in the highest stands. The selective fungicide treatments metalaxyl and pentachloronitrobenzene + carboxin were effective at all three temperatures, implying that Pythium spp. and Rhizoctonia solani, respectively, were involved in seedling disease and active over a range of temperatures. The efficacy of fungicides was not consistently associated with the cultivars used in this study.

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Section: Discussionmentioning

confidence: 99%

Effect of Fungicide Seed Treatments, Cultivars, and Soils on Soybean Stand Establishment

2013

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“…Pythium spp. are common plant pathogens that cause the disease root rot (Schroeder et al 2006, Broders et al 2009). The abundance of Pythium spp.…”

Section: Habitat-specific Community Structurementioning

confidence: 99%

Effects of short-term flooding on aquatic and terrestrial microeukaryotic communities: a mesocosm approach

Graupner¹,

Röhl²,

Jensen³

et al. 2017

Aquat. Microb. Ecol.

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Freshwater and soil are not strictly isolated habitats. In particular, floods may facilitate the exchange of organisms and nutrients. Flooding can have both a stimulating and a harmful effect on the organisms of the respective habitats. The effects of short-term flooding on microeukaryotic communities in the aquatic and terrestrial habitat have so far been scarcely studied. Here, we investigated the effect of a 24 h artificial inundation on the microeukaryotic community composition in AquaFlow mesocosm systems. We investigated the shift of community composition based on molecular amplicon diversity both on soil and water during flooding and for a period of 12 d after flooding. Community composition was, as expected, strongly different between soil and water. Flooding had a significant effect on the freshwater community, whereas the soil community was hardly affected. In particular, we observed a transfer of nutrients from the terrestrial habitat into the aquatic habitat and identified ~50 taxa that were transferred by the flooding event. This effect of flooding was, however, overlaid by shifts of the communities with time, presumably reflecting an acclimatization to the conditions in the AquaFlow systems.

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“…The role of the latter on crop-disease interaction has been a serious matter of concern by many authors [25]–[28]. Regarding the soil, its physical and chemical properties play an important role in the plant health and the consequent disease occurrence and spread [29], [30]. In addition, crop management practices influence significantly the occurrence and control of hazelnut bacterial blight [31].…”

Section: Introductionmentioning

confidence: 99%

“…Their application has undergone a rapid expansion in plant disease epidemiology and management [48]–[52]. More specifically, spatial pattern analysis has been used to investigate factors affecting plant diseases [53]–[56]. The spread of plant diseases can be estimated by spatial interpolation methods, due to its relation with geographical variables such as soil and climatic characteristics [56].…”

Section: Introductionmentioning

confidence: 99%

Epidemiological Study of Hazelnut Bacterial Blight in Central Italy by Using Laboratory Analysis and Geostatistics

et al. 2013

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Incidence of Xanthomonas arboricola pv. corylina, the causal agent of hazelnut bacterial blight, was analyzed spatially in relation to the pedoclimatic factors. Hazelnut grown in twelve municipalities situated in the province of Viterbo, central Italy was studied. A consistent number of bacterial isolates were obtained from the infected tissues of hazelnut collected in three years (2010–2012). The isolates, characterized by phenotypic tests, did not show any difference among them. Spatial patterns of pedoclimatic data, analyzed by geostatistics showed a strong positive correlation of disease incidence with higher values of rainfall, thermal shock and soil nitrogen; a weak positive correlation with soil aluminium content and a strong negative correlation with the values of Mg/K ratio. No correlation of the disease incidence was found with soil pH. Disease incidence ranged from very low (<1%) to very high (almost 75%) across the orchards. Young plants (4-year old) were the most affected by the disease confirming a weak negative correlation of the disease incidence with plant age. Plant cultivars did not show any difference in susceptibility to the pathogen. Possible role of climate change on the epidemiology of the disease is discussed. Improved management practices are recommended for effective control of the disease.

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Association of Soil Chemical and Physical Properties with Pythium Species Diversity, Community Composition, and Disease Incidence

Cited by 82 publications

References 37 publications

Effect of Fungicide Seed Treatments, Cultivars, and Soils on Soybean Stand Establishment

Effect of Fungicide Seed Treatments, Cultivars, and Soils on Soybean Stand Establishment

Effects of short-term flooding on aquatic and terrestrial microeukaryotic communities: a mesocosm approach

Epidemiological Study of Hazelnut Bacterial Blight in Central Italy by Using Laboratory Analysis and Geostatistics

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