Mycorrhizal Status of Sand-Based Cranberry (Vaccinium macrocarpon) Bogs in Southern Oregon

Management
The USDA-ARS affiliated author reports on the results from a survey of several sand-based cranberry bogs in southern Oregon to determine the presence and extent of colonization by ericoid mycorrhizal fungi under organic and conventional production conditions.

Mycorrhizal Fungi in Rooting Substrate Influences the Quantity and Quality of Roots on Stem Cuttings of Hick’s Yew

Propagation
A report on research conducted to determine 1) whether the addition of vesicular–arbuscular mycorrhizal fungi (VAMF) inoculum into the rooting substrate during cutting propagation increases rooting of hick’s yew and 2) how the quantity of VAMF inoculum influences the rooting of hick’s yew under nursery production conditions.

Soil Temperature and Plant Growth Stage Influence Nitrogen Uptake and Amino Acid Concentration of Apple During Early Spring Growth

Nursery Crops
This study focuses on early season changes in nitrogen (N) uptake and amino acid distribution at different root zone temperatures to test whether (1) temperature effects on N uptake are influenced by plant growth stage, and (2) changes in amino acid distribution are related to N uptake.

Changes in Root IAA Content and Growth of Bareroot Conifers with Plant Growth Regulating Substances at Planting

Nursery Crops
An experiment was conducted to determine whether application of plant growth regulators (PGRs) or moisture retention materials could modify IAA concentrations in roots, new root growth, and above ground plant growth. Douglas-fir, Englemann spruce, western larch, and lodgepole pine species were used.

Ten-Year Growth and Survival of Douglas-fir Seedlings Treated with Plant Growth Regulating Substances at Transplant

Nursery Crops
A report on how the application of specific plant growth regulators (PGRs) and a moisture retention gel to the root systems of Douglas-fir can influence root indole-3-acetic acid (IAA) content, and tree growth and survival 10 years after planting in a clearcut.

Influence of Ectomycorrhizal Fungal Inoculation on Growth and Root IAA Concentrations of Transplanted Conifers

Nursery Crops
USDA-ARS affiliated researchers tested the hypothesis that: (1) IAA concentration of mycorrhizal conifer roots is influenced by the in vitro (IAA and ethylene) production capacity of their associated ectomycorrhizal fungi; and (2) increased concentrations of root IAA cause an increase in root growth resulting in improved seedling growth and survival.

A Systematic Approach to Diagnosing Plant Damage

Management
A comprehensive guide for determining the difference between nonliving and living causes of plant damage. The authors also provide a list of available references for identifing plant problems, references topics vary from general plant problem diagnosis to crop specific.

Root Culturing in Bareroot Nurseries

Nursery Crops
Information provided on the bareroot nursery practice of root culturing. Root culturing is defined by the author as a general term for nursery cultural practices designed to modify root growth or morphology while the seedling is still in the nursery bed.

New Pesticide Rules to Protect Ground Water Adopted by Washington State Department of Agriculture

Management
An overview of the pesticide rules adopted by the Washington State Department of Agriculture in 1989. The new rules restricted pesticides containing one of more of the 18 active ingredients identified as having potential to contaminate ground water.

1988 Amendments to FIFRA - What do They Mean?

Management
An explanation of the 1988 amendments to the Federal Insecticide Fungicide and Rodenticide Act (FIFRA). The authors address what the amendments meant for growers, types of crops most affected, and concerns about pesticide re-registration.

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