Genetic Diversity Analysis of in the Pacific Northwest and New Jersey.

, a biotrophic ascomycete, causes eastern filbert blight (EFB) of hazelnuts ( spp.). EFB is endemic in eastern North America, preventing the commercial production of European hazelnut ( L.

Combating an Invasive Boxwood Pathogen - - in the United States by Shifting Production to Less-Susceptible Cultivars.

Boxwood blight (BB) caused by (), an economically devastating disease affecting everyone in the supply chain from growers to gardeners, was first officially documented in the United States in 2011. This disease has taken a heavy toll on boxwood, an iconic landscape plant and the number one evergreen nursery crop. Instead of abandoning boxwood production and switching to other evergreens, growers in the United States, informed by the latest research, have elected to combat this disease.

Diagnostic and Historical Surveys of Sweet Cherry () Virus and Virus-Like Diseases in Oregon.

There are over 35 known virus and virus-like diseases of sweet cherry (), some with potential to cause severe economic impact by reducing vegetative growth, vigor, or fruit quality. Oregon is the second-ranked state for sweet cherry production in the United States. Statewide surveys were conducted in Oregon sweet cherry orchards for virus and virus-like diversity and distribution.

Management of Grape Powdery Mildew with an Intelligent Sprayer and Sulfur.

Wine grapes are an important agricultural commodity in the Pacific Northwest, where grape powdery mildew (GPM) is one of the main disease problems. The efficacy of various sulfur concentrations and output volumes from an air blast sprayer retrofitted with the Intelligent Spray System (ISS) were evaluated for the management of GPM. The ISS consists of a LiDAR sensor, Doppler speed sensor, embedded computer, flow controller, and individual pulse-width-modulation solenoid valves at each nozzle.

Occurrence of Mummy Berry Associated with Huckleberry () Caused by spp. in Oregon.

In this Short Communication we describe the occurrence of mummy berry associated with huckleberry () caused by spp. in Oregon. To our knowledge, this is the first report of a spp.

Progression of Kernel Mold on Hazelnut.

Hazelnut kernel mold, caused by a number of fungal species, has been a chronic problem in Pacific Northwest hazelnut production areas for many years. Two highly susceptible breeding selections and two commercial cultivars were used to investigate kernel mold development over time and possible correlations with rainfall. Nuts were allowed to naturally fall onto orchard soil, regularly collected, cracked open, and evaluated for kernel mold.

Canopy spray application technology in specialty crops: a slowly evolving landscape.

Many specialty crops are susceptible to insects and diseases, and as such are reliant on regular canopy pesticide applications to achieve quality attributes required for salability. The majority of specialty crop producers continue to use antiquated pesticide application technologies for directed canopy spraying such as the radial air blast sprayer that has been associated with chemical wastage and off-target drift of around 40% and 15% of total applied spray volume, respectively. However, precision sprayers are available that result in remarkable improvements to these parameters.

Predicting Ascospore Release of Monilinia vaccinii-corymbosi of Blueberry with Machine Learning.

Mummy berry, caused by Monilinia vaccinii-corymbosi, causes economic losses of highbush blueberry in the U.S. Pacific Northwest (PNW).

Monilinia vaccinii-corymbosi Apothecial Development Associated With Mulch Depth and Timing of Application.

Pseudosclerotia of Monilinia vaccinii-corymbosi overwinter on the soil surface and develop apothecia in early spring, supplying primary inoculum for mummy berry disease of blueberry. Burial of pseudosclerotia in soil and incubation in the dark have previously been identified as critical factors inhibiting M. vaccinii-corymbosi apothecial development.

Population structure of Geosmithia morbida, the causal agent of thousand cankers disease of walnut trees in the United States.

The ascomycete Geosmithia morbida and the walnut twig beetle Pityophthorus juglandis are associated with thousand cankers disease of Juglans (walnut) and Pterocarya (wingnut). The disease was first reported in the western United States (USA) on several Juglans species, but has been found more recently in the eastern USA in the native range of the highly susceptible Juglans nigra. We performed a comprehensive population genetic study of 209 G.

Genetic differentiation and spatial structure of Geosmithia morbida, the causal agent of thousand cankers disease in black walnut (Juglans nigra).

The main objectives of this study were to evaluate genetic composition of Geosmithia morbida populations in the native range of black walnut and provide a better understanding regarding demography of the pathogen. The fungus G. morbida, and the walnut twig beetle, Pityophthorus juglandis, have been associated with a disease complex of black walnut (Juglans nigra) known as thousand cankers disease (TCD).

Effect of Copper Bactericides on Copper-Resistant and -Sensitive Strains of Pseudomonas syringae pv. syringae.

Fourteen formulations of copper-based bactericides were evaluated for their efficacy in reducing populations of copper-resistant and -sensitive strains of Pseudomonas syringae pv. syringae growing on tissue-cultured lilac and of copper-sensitive strains of this pathogen on field-grown lilac. The amount of free cupric ions (Cu) in solution was the only predictor of formulation efficacy, but this variable could not be estimated from the metallic copper content of the product.

Rapid Evaluation of Pathogenicity in Pseudomonas syringae pv. syringae with a Lilac Tissue Culture Bioassay and Syringomycin DNA Probes.

Losses from diseases caused by Pseudomonas syringae pv. syringae occur on a large number of deciduous woody plants in commercial nurseries in the Pacific Northwest. Bioassays for pathogenicity are one step in the identification of P.