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Granada, Spain

Lopez-Gomez M.,IRTA - Institute of Agricultural-Alimentary Research and Technology | Talavera M.,Centro Camino Of Purchil | Verdejo-Lucas S.,IRTA - Institute of Agricultural-Alimentary Research and Technology | Verdejo-Lucas S.,Centro La Mojonera
Plant Pathology | Year: 2016

The suitability of watermelon cultivars and cucurbit rootstocks as hosts to Meloidogyne incognita and M. javanica was determined in pot and field experiments. Meloidogyne incognita showed higher reproduction than did M. javanica on watermelon and cucurbit rootstocks. The watermelon cultivars did not differ in host status when challenged with these two species and supported lower nematode reproduction than the cucurbit rootstocks. Rootstocks Lagenaria siceraria cv. Pelops and Cucurbita pepo AK15 supported lower reproduction than did the squash hybrid rootstocks (C. maxima × C. moschata). Egg production increased (P < 0·05) with a rising initial inoculum level (Pi) in the non-grafted Sugar Baby but the reproduction factor Rf (eggs per plant/Pi) was similar at two Pi levels. The total egg production in the plants grafted onto squash hybrids RS841 and Titan was greater (P < 0·05) at the higher Pi, but the Rf values were lower. The development of field-grown non-grafted watermelon plants was significantly stunted in plots where nematodes were detected at planting. However, no differences were observed in plots with grafted plants. In plots with nematodes, non-grafted and Titan-grafted plants had similar yields that were higher than that of RS841-grafted plants. In the commercial plastic houses with grafted watermelon, the average Rf value was 42-fold, confirming the high susceptibility of squash hybrids as rootstocks for grafted watermelon. The Titan-Sugar Baby combination was tolerant to M. javanica. © 2016 British Society for Plant Pathology. Source


Glenk K.,Macaulay Institute | Colombo S.,Centro Camino Of Purchil
Journal of Agricultural Economics | Year: 2011

The economic valuation of benefits resulting from environmental policies and interventions often assumes that environmental outcomes are certain. In fact, these outcomes are typically uncertain. This article proposes a methodological approach to incorporate delivery uncertainty into benefit estimation based on stated preference methods. In the study design of a choice experiment survey on land-based climate change mitigation, we explicitly include delivery uncertainty as the risk that a proposed mitigation project fails to deliver emission savings. We find that respondents' preferences do not change significantly after being confronted with choices that included risk of failure. However, failure risk itself does have an important impact on the preferences for delivering emission reductions. We show that delivery uncertainty can have a large impact on stated preference estimation of benefits of public programmes. This result should condition conclusions drawn from ex-ante environmental cost-benefit analyses that make use of such benefit estimates. © 2010 Blackwell Publishing Ltd. Source


Glenk K.,Macaulay Institute | Glenk K.,Land economics and Environment Research Group | Colombo S.,Centro Camino Of Purchil
Climatic Change | Year: 2011

Soil carbon sequestration has been regarded as a cheap and cost-effective way to sequester carbon until other technologies to tackle climate change become available or more cost-effective. An assessment of the social desirability of a soil carbon sequestration policy requires the consideration of all associated social costs and benefits. Measures to re-accumulate carbon in soils have ancillary or co-effects on the environment that can be beneficial or detrimental to social welfare and few of which are traded in markets. This paper discusses issues related to the development of soil carbon sequestration policies into agri-environmental schemes and reports findings from an application of a choice experiment to elicit preferences and estimate benefits of a soil carbon programme in Scotland under consideration of co-effects on biodiversity and rural viability. Preferences for soil carbon based mitigation are found to be heterogeneous and related to beliefs about climate change and attitudes towards its mitigation. Benefit estimates suggest that including co-effects can significantly change the outcome of cost-benefit tests. Implications for the development of climate change policies are discussed. © 2010 Springer Science+Business Media B.V. Source


Verdejo-Lucas S.,IRTA - Institute of Agricultural-Alimentary Research and Technology | Blanco M.,IRTA - Institute of Agricultural-Alimentary Research and Technology | Talavera M.,Centro Camino Of Purchil | Stchigel A.M.,Rovira i Virgili University | Sorribas F.J.,Polytechnic University of Catalonia
Biocontrol Science and Technology | Year: 2013

A survey was conducted in root-knot nematode-infested plastic houses to determine the diversity and frequency of occurrence of fungi associated with the nematode. The relationships between percentage fungal parasitism and physicochemical properties of soil were also investigated. Fifty-nine plastic houses were sampled in southeastern Spain, 42 treated with nematicides and 17 left untreated. Eleven fungal genera and unidentified fungi were isolated from nematode eggs or juveniles. Fungal parasitism occurred more frequently in untreated (82.4%) than treated (50%) soils. The species richness in untreated soils ranged from 0 to 5, the Shannon-Wiener diversity index (a measurement of how many different fungi there are in site taking into account how evenly they are distributed among the site) from 0 to 2.01, and the evenness index from 0.46 to 0.99. In treated soils, species richness ranged from 0 to 4, the Shannon-Wiener diversity index from 0 to 1.61, and the evenness index from 0.81 to 1. Of the sites with nematophagous fungi, Arthrobotrys dactyloides (34%), Cylindrocarpon sp., Neosartoria hiratsukae (17%), and Fusarium solani (14%) were the fungi most frequently found. Physicochemical properties of soil were similar in nematicide treated and untreated soils. Percent fungal parasitism in untreated soils correlated positively with lime, silt and carbonate content of soil. © 2013 Taylor & Francis. Source


Glenk K.,Land economics and Environment Group | Colombo S.,Centro Camino Of Purchil
Australian Journal of Agricultural and Resource Economics | Year: 2013

In this study, we introduce information on outcome-related risk as an additional attribute in a choice model of preferences for a land-based climate change mitigation project. We provide a comprehensive comparison of different model specifications arising from different behavioural assumptions about the way that respondents process information on outcome-related risk within the choice task. We find significant differences between several specifications in terms of both model fit and WTP estimates. The behavioural assumptions made when choosing a particular model specification, and reasons that motivate them should be made explicit, and consequences of using different specifications should not be ignored. © 2013 Australian Agricultural and Resource Economics Society Inc. and Wiley Publishing Asia Pty Ltd. Source

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