A field guide to insects and diseases of California oaks

Swiecki, Tedmund J.; Bernhardt, Elizabeth A.

doi:10.2737/psw-gtr-197

Cited by 39 publications

(36 citation statements)

References 8 publications

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“…Although there has been a notable summary of studies and compilation of pests and pathogens that cause damage on oak species in Califomia (47), the current study is one of tbe first comprebensive assessments for fungal species in aboveground symptomatic woody tissues of coast live oak in California that also screened frequently recovered fungi for pathogenicity. Tbis study bas identified a new fungal species, Cryptosporiopsis querciphila sp.…”

Section: Discussionmentioning

confidence: 99%

“…Oak woodlands support higher levels of biodiversity than any other terrestrial ecosystem in California (47). Coast live oak (Quercus agrifolia) is a common evergreen tree that dominates oak woodlands throughout western North America, from Mendocino County, CA to Baja California, Mexico (40).…”

mentioning

confidence: 99%

“…Other important disease agents of coast live oak in northern California include Phytophthora ramorum in forests (42) and Armillaria mellea in urban developments (47). Coast live oak is also host to a wide range of additional fungal pathogens and insects causing crown dieback or root damage that affect tree health but may be involved in coast live oak mortality (47).…”

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confidence: 99%

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Identification of New Fungal Pathogens of Coast Live Oak in California

et al. 2013

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Section: Discussionmentioning

confidence: 99%

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confidence: 99%

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Identification of New Fungal Pathogens of Coast Live Oak in California

et al. 2013

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“…To-date in the USA, this scale insect has been found only in California, where it is called Kuwana oak scale (Gill, 1993;Ben-Dov, 2005). Colour photographs and field information are provided by Swiecki & Bernhardt (2006), who report that infestations in California tend to be highly localised in distribution. In Solano and Yolo counties, adult females and nymphs of various instars have been collected in different years in every month from March to July and in November, and immature males in at least March (based on dates of collections in the California State Collection of Arthropods, CDFA, Sacramento, and those of PJG from Yolo and Napa counties).…”

Section: Discussionmentioning

confidence: 99%

The taxonomy of the Japanese oak red scale insect, Kuwania quercus (Kuwana) (Hemiptera: Coccoidea: Kuwaniidae), with a generic diagnosis, a key to species and description of a new species from California

Nan

Gullan

et al. 2013

Zootaxa

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The oak red scale insect, Kuwania quercus (Kuwana), was described from specimens collected from the bark of oak trees (Quercus species) in Japan. More recently, the species has been identified from California and China, but Californian specimens differ morphologically from Japanese material and are considered here to be a new species based on both morphological and molecular data. In this paper, an illustrated redescription of K. quercus is provided based on type specimens consisting of adult females, first-instar nymphs and intermediate-stage females, and a lectotype is designated for Sasakia quercus Kuwana. The new Californian species, Kuwania raygilli Wu & Gullan, is described and illustrated based on the adult female, first-instar nymph and intermediate-stage female. A new generic diagnosis for Kuwania Cockerell based on adult females and first-instar nymphs, and a key to species based on adult females are included.

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“…We did not verify the presence of P. ramorum in our diseased plots, but we are confident that these plots were indeed infected because (a) mortality levels were very high and no other agent is known to cause such severe and widespread mortality of tanoak [26], (b) presence of the pathogen has been previously confirmed in the general vicinity of all diseased plots [5,27,28], and (c) characteristic symptoms of SOD (see [8]) were common. Some of our "healthy" plots may also have been infected with P. ramorum (areas that are entirely unaffected have become very rare at many infected sites), but any resulting tanoak mortality was much lower than in our "diseased" plots.…”

Section: Methodsmentioning

confidence: 99%

Sudden Oak Death-Induced Tanoak Mortality in Coast Redwood Forests: Current and Predicted Impacts to Stand Structure

Ramage

O’Hara

2010

Forests

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Tanoak (Notholithocarpus densiflorus syn. Lithocarpus densiflorus) is one of the most widespread and abundant associates of coast redwood (Sequoia sempervirens), but little is known about the structural relationships between these two species. Knowledge of such relationships is essential for a thorough understanding of the impacts of sudden oak death (caused by the exotic pathogen Phytophthora ramorum), which is currently decimating tanoak populations throughout the redwood range. In this study, we utilized a stratified plot design and a stand reconstruction technique to assess structural impacts, at present and in the future, of this emerging disease. We found that residual trees in diseased plots were more aggregated than trees in unaffected plots, and we predicted that the loss of tanoak will lead to the following short-term changes: greater average diameter, height, height-to-live-crown, and crown length, as well as an increase in average nearest neighbor differences for diameter, height, and crown length. In addition, plots lacking tanoak (living or dead)-as compared to plots with tanoak-exhibited greater average diameter and increased nearest neighbor differences with regard to diameter, height, and crown length. We also conducted a preliminary exploration of how sudden oak death-induced structural changes compare with typical old-growth characteristics, and how this disease may affect the structure of old-growth forests. OPEN ACCESSForests 2010, 1 115

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A field guide to insects and diseases of California oaks

Cited by 39 publications

References 8 publications

Identification of New Fungal Pathogens of Coast Live Oak in California

Identification of New Fungal Pathogens of Coast Live Oak in California

The taxonomy of the Japanese oak red scale insect, Kuwania quercus (Kuwana) (Hemiptera: Coccoidea: Kuwaniidae), with a generic diagnosis, a key to species and description of a new species from California

Sudden Oak Death-Induced Tanoak Mortality in Coast Redwood Forests: Current and Predicted Impacts to Stand Structure

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