Irrigation Water Recirculating Systems

Irrigation
A report on studies conducted to determine whether irrigation water recirculating systems increases the spread of pathogens. Topics discussed include root death, factors causing root growth check, other possible pathogen sources, and chemical treatments.

Strategies for Turfgrass Renovation

Management
Practical strategies for the renovation of turfgrass, used to improve existing turf or change grass species for improved performance. The basic strategies discussed include simple overseeding, overseeding following suppression of existing turf, and complete renovation.

Poinsettias - Leaf Malformation

Greenhouse Crops
Information provided on the greenhouse crop poinsettias and the possible causes of poinsettia leaf malformation. The Oregon State University affiliated author briefly discusses several possible causes which include chemical, disease, heat stress, water stress, and nutrient deficiencies.

Getting to the Root (and Corm) of Cyclamen Diseases

Greenhouse Crops
An informative discussion about common Cyclamen diseases. The author addresses Botrytis, Pythium, Thielaviopsis, Rhizoctonia, Fusarium, and Erwinia. Descriptions of pathogen symptoms and signs are provided along with possible control options.

Maintaining Disease-Free Geranium Stock Plants...The Impossible Dream?

Greenhouse Crops
The Oregon State University affiliated author discusses methods and practices used to reduce or eliminate disease in geranium stock plants. Common geranium pathogens include Botrytis, Pythium, Rhizoctonia, Thielaviopsis, Xanthomonas, and Verticillium wilt.

Aphids in Greenhouse Crops

Insects
The most common aphid species causing problems in greenhouse crops are the green peach aphid (Myzus persicae), melon/cotton aphid (Aphis gossypii), chrysanthemum aphid (Macrosiphoniella sanbomi), rose aphid (Macrosiphum rosae), potato aphid (M. euphorbiae), and the leaf-curling plum aphid (Brachycaudus helichrysi).

Greenhouse Management of Western Flower Thrips and Tomato Spotted Wilt Virus

Greenhouse Crops
The Western flower thrip (Frankliniella occidentalis), a vector of tomato spotted wilt virus, is discussed. Information is provided on the following topics; the virus, thrips identification and lifecycle, management, barriers, monitor, chemical controls, and sanitation.

Control of Liverwort and Moss in Nursery Containers

Weeds
Study conducted to determine an effective control for liverwort and moss in nursery containers. The topics discussed include the prevention of liverwort and moss establishment, control of established liverwort and moss, and phytotoxicity of tested chemicals.

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.

Toxicity of Growing Medium Drench Fungicides

Media
The Ohio State University affiliated author discusses growing medium fungicide drenches and phytotoxicity. The discussion was prompted by reports of growers having issues with stunting and leaf burning after a fungicide drench of growing medium was applied.

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