Enterohemorrhagic Escherichia coli (EHEC) and Salmonella enterica have been implicated in several disease outbreaks linked to consumption of fresh vegetables. Both ruminant and non-ruminant animals carry EHEC and S. enterica in their gastrointestinal tracts and can shed the pathogens in the faecal matter both in symptomatic and asymptomatic states. Application of animal waste in soil fertility management and irrigation of crops with contaminated waste water has been recognised as an important route through which EHEC and S. enterica can contaminate fresh vegetables during primary production. The behavior of E. coli O157:H7 and S. enterica in the agricultural environment has been extensively studied in the last decades. Several microbiological detection methods have been applied. This review therefore puts together current knowledge on the behavior of E. coli O157:H7 and S. enterica in the manure-amended soil-plant ecosystem of fresh vegetable crops during cultivation under various environmental conditions. The review focuses on methodological issues involved in undertaking survival studies and makes comparative analysis of experimental results obtained from studies conducted under controlled environmental conditions integrating results obtained from field experiments. Finally, a theoretical discussion on the potential likely impact of climate change on pre-harvest safety of field-cultivated vegetables is highlighted.

Unlike most studies that focused on specific innovations, this study systematically analyzed farmers’ adoption of agricultural innovations in general. It reports willingness to pay (WTP; willingness to accept (WTA)) as a proxy for adoption, its determinants, applied methods, and statistical models. After searching and screening, 80 studies qualified for review. Majority ( n = 30) of studies focused on farmers’ WTP for innovations in agricultural water provision or environmental and crop protection ( n = 35), while the remaining studies handled crop or animal improvement innovations. Most studies were performed in developing countries, using stated preference methods for economic valuation, with 55% of the studies ( n = 44) applying contingent valuation compared to 39% taking choice modeling approach. While farmers are generally willing to pay premium for improvement in agriculture technologies, WTP (WTA) depends on the innovation (system). For example, premiums ranged from about 0.125 to 2 USD/m3 of water depending on water supply (e.g. ground vs. surface water). Furthermore, the determinants of farmers’ WTP can be grouped into sociodemographic, biophysical, technological, institutional, and behavioral factors. As illustrated by relatively high WTP, the review demonstrates that farmers embrace most innovations, regardless of the context and methods applied.

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Performance perceptions among supply chain members: A triadic assessment of the influence of supply chain relationship quality on supply chain performance Abstract Purpose: A good supply chain relationship quality (RQ) is a crucial precursor for any stable exchange relationship which ensures relationship continuity. Although empirical research suggests that strengthening RQ improves supply chain performance (SCP), most studies have focused on dyadic business relationships. To fully understand the relational behaviour of a firm embedded in a supply chain, we need to look beyond the dyad into triads. This paper investigates how SCP is influenced by RQ in a triadic agribusiness supply chain.Design/methodology/approach: Evidence is drawn from a quantitative survey of 150 agribusiness firms in the maize supply chain in Uganda. Data was collected in triadic context from 50 direct supply chains each composing of a supplier, focal firm and customer. Multigroup structural equations modelling (SEM) was used to assess the differences in perception on the influence of RQ on SCP amongst the supply chain members. Findings:Results provides empirical support for the positive influence of RQ on SCP. SEM reveals differences in perception between the upstream and downstream and amongst the supply chains members. While focal firms considered conflict, coercive power, commitment and trust to be important; suppliers considered trust, dependency and non-coercive power; and customers considered trust, dependency and coercive power to be important RQ factors affecting supply chain performance. Practical implications:For agribusiness managers to enhance business performance there is need to cultivate strong and mutual relationship with supply chain members. It is also important to know how to handle conflicts and use of power so as to realise the benefits of supply chain relationships. Originality/value: Our paper is novel in that it assesses SCP in a triadic context in an agribusiness sector from a developing country context. We used novel approaches including analysis of a triad, and multiple groups SEM to assess perceptions of each supply chain member's. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 there still remains some critical gaps in SCM literature that deserve critical attention.Firstly, most previous studies have focused on business-to-business (b2b) or businessto-consumer (b2c) relationships in dyadic settings (Athanasopoulou, 2009; Choi & Wu, 2009;Molnár et al., 2010;Nyaga et al., 2010). Analysing the supply chain at a dyadic level does not bring out the underlying dimensions of a supply chain (Kühne, Gellynck, & Weaver, 2013;Mentzer et al., 2001;Molnár et al., 2010;Rungtusanatham, Salvador, Forza, & Choi, 2003;Wu, Choi, & Rungtusanatham, 2010).Secondly, most studies used data derived using a focal firm approach. This approach is not devoid of t...