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.


Information provided by the author intended to aid in the identification and management of the greenhouse whitefly (Trialeurodes vaporariorum) and the sweetpotato whitefly (Bremisia tabaci). Monitoring whiteflies, chemical control and whitefly resistance, and biological control are discussed.

Update on Western Flower Thrips

An update for the greenhouse industry regarding the Western flower thrips and tomato spotted wilt virus. Growers were starting to report western flower thrip resistance to certain insecticides. Western flower thrips lifecycle along with possible control methods are discussed by the authors.

Update on Tomato Spotted Wilt Virus

Greenhouse Crops
Increasing number of reports of greenhouse crops displaying symptoms of tomato spotted wilt virus (TSWV) prompted the authors to address the issue. Topics discussed are; the history of TSWV in the US, the wide variety of ornamental and non-ornamental hosts, symptoms, and control.

Symptoms of Stephanotis Infected With Tomato Spotted Wilt Virus

Greenhouse Crops
Discussion about the discovery of tomato spotted wilt virus found to be infecting the greenhouse crop Stephanotis floribunda Brongn. The Oregon State University affiliated authors include when the disease was first noticed in Oregon greenhouses and a description of the symptoms.

Tomato Spotted Wilt Virus in Greenhouse Crops

Greenhouse Crops
A brief report on tomato spotted wilt virus (TSWV). The discussion focuses on host plants for the disease, which includes a wide range of flowering greenhouse crops, common weed hosts, and vegetable crops. The author also addresses transmission and control of TSWV.

Xylella fastidiosa, A Newly Named Bacterium, Causes Leaf Scorch on Several Shade and Fruit Trees

Plant Disease
Information on the bacterium Xylella fastidiosa which is closely related to Xanthomonas. Xylella fastidiosa was found in the following shade and fruit trees; American elm, American sycamore, red oak, red maple, mulberry, periwinkle, grape, almond, plum, peach and from ragweed.

Pseudomonus syringae: Disease and Ice Nucleation Activity

Plant Disease
A technical report on what is know and what is not known about Pseudomonas syringae in the nursery industry. Main topics are plant symptoms, severity of the disease, classification of Pseudomonas syringae isolates, sources and survival, hosts, and controls and recommendations.

Narcissus-Recommendations for Control of Basal Rot of Daffodils

A discussion about the control of basal rot of daffodils caused by the fungus Fusarium oxysporum F. sp. Narcissi. Topics discussed by the Washington State University affiliated author include basal rot lifecycle, and a series of recommendations on practices used to control basal rot of daffodils.

European Rhododendron Rust

Plant Disease
European rhododendron rust (Chrysomyxa ledi var rhododendri), is a disease which can lead to severe defoliation in rhododendrons and deciduous azaleas. The rust also affects it's alternative host, spruce (Picea sp.) and can cause severe defoliation. Symptoms, disease lifecycle, and control are discussed.