Persistence of<i>Xylella fastidiosa</i>in Riparian Hosts Near Northern California Vineyards

Baumgartner, Kendra; Warren, Jeremy G.

doi:10.1094/pd-89-1097

Cited by 22 publications

(11 citation statements)

References 18 publications

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“…2011) and in the surrounding landscape (including native plants; e.g. Baumgartner & Warren 2005); these are not captured in the coarse land‐cover designations of ‘natural’ or ‘non‐crop’ that are often used. Other bottom‐up factors that may be associated with increased landscape complexity (e.g.…”

Section: Discussionmentioning

confidence: 99%

A meta‐analysis of crop pest and natural enemy response to landscape complexity

et al. 2011

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Many studies in recent years have investigated the relationship between landscape complexity and pests, natural enemies and ⁄ or pest control. However, no quantitative synthesis of this literature beyond simple vote-count methods yet exists. We conducted a meta-analysis of 46 landscape-level studies, and found that natural enemies have a strong positive response to landscape complexity. Generalist enemies show consistent positive responses to landscape complexity across all scales measured, while specialist enemies respond more strongly to landscape complexity at smaller scales. Generalist enemy response to natural habitat also tends to occur at larger spatial scales than for specialist enemies, suggesting that land management strategies to enhance natural pest control should differ depending on whether the dominant enemies are generalists or specialists. The positive response of natural enemies does not necessarily translate into pest control, since pest abundances show no significant response to landscape complexity. Very few landscape-scale studies have estimated enemy impact on pest populations, however, limiting our understanding of the effects of landscape on pest control. We suggest focusing future research efforts on measuring population dynamics rather than static counts to better characterise the relationship between landscape complexity and pest control services from natural enemies.

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Section: Discussionmentioning

confidence: 99%

A meta‐analysis of crop pest and natural enemy response to landscape complexity

et al. 2011

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“…Trap catches of G. atropunctata are lower in the vineyard interior, compared to the outermost vineyard rows, indicating vector movement from riparian corridors into vineyards (Purcell, 1975). Plant species found in these riparian habitats have been reported as competent hosts of X. fastidiosa (Baumgartner & Warren, 2005), and grapevines showing symptoms are more common near the riparian vegetation–vineyard interface than in the vineyard interior (Purcell, 1974). Thus, riparian habitats function as a source of vectors and the pathogen, facilitating primary spread of X. fastidiosa into nearby vineyards (Purcell, 1974, 1981).…”

Section: Introductionmentioning

confidence: 99%

Understanding the effects of multiple sources of seasonality on the risk of pathogen spread to vineyards: vector pressure, natural infectivity, and host recovery

Gruber

Daugherty

2012

Plant Pathology

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Seasonality plays an important role in the dynamics of infectious disease. For vector-borne pathogens, the effects of seasonality may be manifested in the variability in vector abundance, vector infectiousness, and host-infection dynamics over the year. The relative importance of multiple sources of seasonality on the spread of a plant pathogen, Xylella fastidiosa, into vineyards was explored. Observed seasonal population densities of the primary leafhopper vector, Graphocephala atropunctata, from 8 years of surveys in northern California were incorporated into a model of primary spread to estimate the risk of pathogen infection under different scenarios regarding seasonality in vector natural infectivity (i.e. constant or increasing over the season) and grapevine recovery from infection (i.e. none or seasonal recovery). The extent to which local climatic conditions affect risk estimates via differences in vector abundance was investigated. Seasonal natural infectivity, seasonal recovery, and especially the combination, reduced (up to 8-fold on average) within-season and cumulative yearly estimates of pathogen spread. Estimated risk of infection also differed greatly among years due to large differences in vector abundance, with wet and moderate winter and spring conditions favouring higher G. atropunctata abundance. Seasonal variation of the pathogen-vector interaction may play an important role in the dynamics of disease in vineyards, reducing the potential prevalence from what it could be in their absence. Moreover, climate, by affecting sharpshooter leafhopper abundance or activity, may influence Pierce's disease dynamics.

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“…Vineyard proximity to riparian areas and its relationship to higher PD risk is a relationship that is well known (Purcell and Saunders ), because the riparian zone is a preferred habitat of G. atropunctata , which takes advantage of the relatively high water status of plants there throughout the year (Purcell ). The riparian zone is also prime habitat for many host plant reservoirs of Xf (Baumgartner and Warren ).…”

Section: Resultsmentioning

confidence: 99%

Environmental variables influencing the incidence of Pierce's disease

Costello

Steinmaus

Boisseranc

2017

Australian Journal of Grape and Wine Research

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Background and Aims Pierce's disease (PD) of cultivated grape, Vitis vinifera, caused by the bacterium Xylella fastidiosa (Xf) and transmitted by xylem‐feeding insects, can lead to vine decline and death. Infection and expression of PD among or within vineyards vary, depending on known environmental variables, such as climate and Xf vegetative reservoirs, as well as some which are little studied with respect to PD, such as soil, water and nutrition. Methods and Results We collected data on over 30 environmental variables and used canonical correspondence analysis (CCA) and discriminant analysis (DA) to analyse their relationship to PD infection, sharpshooter density and Xf reservoir plants. The CCA found high positive correlation between PD and vineyard proximity to citrus orchards, and moderately positive correlation between PD and grape petiole Zn concentration and soil pH. The DA retained eight variables and predicted an increased risk of PD with higher cover of annual grasses, proximity to riparian habitat, increasing soil pH and increasing petiole Zn; PD risk decreased with higher perennial grass cover, higher latitude, increasing vine water stress and increasing soil cation exchange capacity. Conclusions We identified several novel variables which contributed to expression of PD and may improve the understanding of the role of environment in the disease triangle. Significance of the Study That the models include factors relating to soil and soil/plant relations suggest that these variables and their interactions play a role in constitutive or induced plant defenses to Xf and provides a basis for further study into management options for PD.

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Persistence ofXylella fastidiosain Riparian Hosts Near Northern California Vineyards

Cited by 22 publications

References 18 publications

A meta‐analysis of crop pest and natural enemy response to landscape complexity

A meta‐analysis of crop pest and natural enemy response to landscape complexity

Understanding the effects of multiple sources of seasonality on the risk of pathogen spread to vineyards: vector pressure, natural infectivity, and host recovery

Environmental variables influencing the incidence of Pierce's disease

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