ELISA Tests for Detection of Phytophthora

Plant Disease
Report on experiments conducted on the use of ELISA for detection of Phytophthora. The University of California, Davis affiliated authors address the reliability of ELISA for the detection of Phytophthora and several other diseases. They also discuss the future of their research involving ELISA and disease detection.

Rhododendron Leaf Spot and Stem Dieback Caused by Phytophthora syringae

Plant Disease
Research conducted by Dr. R. G. Linderman on rhododendron leaf spot and stem die back determined both to be caused by Phytophthora syringae. Details about the effects and lifecycle of the fungus and possible control methods are provided.

Effects of Raised and Ground-Level Beds and Pine Bark on Survival of Azalea and Population Dynamics of Phytophthora innamomi.

Nursery Crops
North Carolina State University affiliated authors conducted a study to investigate the effects of planting azalea in raised and ground-level beds and pine bark. The study examined the survival rate of the plants and the population levels of Phytophthora innamomi.

APHIS Adding Eight New Species to List of Phytophthora ramorum Associated Plant Taxa

Effective March 1 2012, the lists of regulated hosts and plants associated with P. ramorum will include eight new plants and other changes.

New website focusing on species of Phytophthora launched by OSU Professor Jennifer Parke.

Forest Phytophthoras of the World is an international resource for the latest information on ten major species of Phytopthora.

Hearing date set for possible expansion of the Sudden Oak Death (SOD) quarantine area in Southern Oregon.

A hearing is scheduled to discuss proposed changes to the quarantine area and allow use of an oak from disease free area.

Spraying Leaves of Pear Nursery Trees with Urea and Copper Ethylenediaminetetraacetic Acid Alters Tree Nitrogen Concentration without Influencing Tree Susceptibility to Phytophthora syringae

Nursery Crops
An investigation was conducted into the increased susceptibility of pear nursery trees to infection by Phytophthora syringae following fall foliar sprays of urea which increased nitrogen (N) content in the trees. The authors discuss the methods and materials involved in the experiments along with the results.

Tree Growth Stage and Environment After Pathogen Inoculation Alters Susceptibility of Pear Trees to Phytophthora Canker

Nursery Crops
The results of an investigation on pear (Pyrus communis L. OHF97) to determine whether specific factors influence the tree's susceptibility to Phytophthora syringae Klebahn. The factors included tree growth stage, nitrogen (N) status, wound age, and infection environment.

Special: Dogwood Diseases

Plant Disease
A discussion of dogwood (Cornus florida L.) diseases and their impact on the growth of the shade tree which could have an effect on the market value of the tree. Diseases discussed include; foliar diseases, viruses, twig blights, root rots, cankers, and a few other important diseases.

Detection & Control of Pathogens in the Water

Irrigation
The authors discuss the importance of water quality in regard to irrigation water, the source of the water used, and the various pathogens it could contain. Detection of pathogens in water, control methods, and a titration method for chlorine content are addressed.

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