Tomas Pastalka

Dominican University of California

Cotoneaster (Rosaceae) is a genus of woody plants native to the Palearctic region which includes popular ornamental plants; some are invasive in parts of the USA. In May 2022 symptomatic leaves were detected on Cotoneaster pannosus (Silverleaf Cotoneaster) in Marin County, California (37.89165, -122.56755 ), an area infested heavily by Phytophthora...

Golden or giant chinquapin, Chrysolepis chrysophylla (Fagaceae), is a slow growing, evergreen shrub or tree, native to the west coast of the US. In April 2015, several declining chinquapin trees were identified on Bolinas Ridge near Mt. Tamalpais in Marin Co. CA, a Phytophthora ramorum infested region. Branch dieback was observed but no bole or bra...

Reliable data on the transmission of airborne plant pathogens are crucial for the development of epidemiological models and implementation of management strategies. The short-distance vertical transmission of the forest pathogen Phytophthora ramorum from a symptomatic California bay laurel (Umbellularia californica) to healthy containerized rhodode...

The potential aerial spread of Phytophthora ramorum, causal agent of Sudden Oak Death and Ramorum blight, from infected plants in a quarantine research nursery at the National Ornamentals Research Site at Dominican University of California (NORS-DUC) to the environment was monitored weekly for five years (2011-2016) using a sentinel system. P. ramo...

Phytophthora ramorum, the causal agent of Sudden Oak Death and Ramorum blight, can infest several dozen host plants, among them many important ornamental plants like Rhododendron, Viburnum and Camellia. Federal and state regulations require the destruction of nursery plants infected by P. ramorum and treatment of contaminated soil. Infected nursery...

Sudden Oak Death, caused by Phytophthora ramorum Werres, De Cock & Man in`t Veld, is among the most important emerging forest diseases with potentially devastating effects on temperate forests. The nursery trade is a factor in the long-range spread of P. ramorum. To address threats posed by plant trade and aid in developing an environmentally-susta...

In November 2006, trees of Italian alder (Alnus cordata) were observed declining in association with bleeding trunk cankers in a commercial landscape in Foster City, CA. A species of Phytophthora was isolated on PARP selective medium from the leading edge of the cankers. The Phytophthora species was homothallic with primarily paragynous antheridia...

Typescript. Thesis (Ph. D.)--University of Wisconsin--Madison, 1980. Vita. Includes bibliographical references.