Chemical Growth Regulators

Report on chemical growth regulators for use in greenhouse and nursery crop production. Studies were conducted to determined the effectiveness of the growth regulators on the following crops; zonal geraniums, hibiscus, hydrangea, kalanchoe, weeping fig, several trees species, poinsettias, Easter lilies, and freesia.

Thoughts on Fall Planting of Lawns - Seed Identification

Guide for the identification of lawn seed crops including tall fescue, annual ryegrass, perennial ryegrass, red fescue, chewings fescue, hard fescue, bluegrass, and bentgrasses. The Oregon State University affiliated author offers descriptions with identifying characteristics for each grass seed discussed.

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.

Evaluation of Ronstar and a Combination of Methazole and Prodiamine on Container-Grown, Broad-Leaved Evergreen Shrubs

Nursery Crops
Research conducted in affiliation with Oregon state University on herbicide phytotoxicity of Ronstar, Methazole, and Priodiamine. Plants tested included Calluna vulgaris, Cotoneaster congesta, Euonymus fortunei 'Emerald n 'Gold', Ilex crenata 'Green Island' and Ligustrum japonicum.

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.

Plant-Damaging Pollutants in the Atmosphere

Greenhouse Crops
Report based on studies conducted by researchers into the effects of ethylene on ornamental plants throughout the plant's lifecycle. Topics discussed include symptoms, ethylene sources to avoid, and plant species sensitivity classification.

Gladiolus-Postharvest Handling of Gladiolus Corms

Post Harvest
Guide for the prevention and control of Stromatinia, Curvularia, Botrytis, Fusarium corm rot, thrips, nematodes, bulb mites and aster yellows mycoplasm. Information provided on how to cure and store gladiolus corms, dormancy, and Rhizoctonia solani.

When Air Temperatures Exceeded 90ºF...

Research conducted on growth and flower bud formation of three rhododendron cultivars grown with and without overhead irrigation. Authors were interested in determining the role of overhead irrigation and adequate soil moisture in preventing sunburned foliage.

Hot Weather Sprinkling Damages Plants? Protects Plants?

Plant disorders
The Oregon State University affiliated author addresses hot weather sprinkling and whether or not it damages or protects plants. Incite is offered into how water could be affecting the plants in high temperatures and whether or not it actually leads to plant damage.

Botrytis Develops Resistance to Fungicide Used in Bulb Crops

Plant Disease
Study conducted in response to reports from growers of bulb crops indicated a loss of Botrytis control with the fungicides Benlate and Chipco-26019 in both greenhouse and field-grown situations. The authors discuss the results, fungicide resistance and how to avoid fungicide resistance.