Novel Pathogen-Plant Host Interaction: and L. (White Ash) in a Sentinel Garden in China.

L. (white ash), a native North American tree commonly cultivated for its ornamental qualities, displayed symptoms of leaf spot disease in a sentinel garden located in Nanjing, Jiangsu, China, in 2022. This disease led to premature leaf shedding, adversely affecting the plant's growth and substantially diminishing its ornamental value.

A Global Assessment of the State of Plant Health.

The Global Plant Health Assessment (GPHA) is a collective, volunteer-based effort to assemble expert opinions on plant health and disease impacts on ecosystem services based on published scientific evidence. The GPHA considers a range of forest, agricultural, and urban systems worldwide. These are referred to as (Ecoregion × Plant System), i.

Comparison of Diplodia Tip Blight Pathogens in Spanish and North American Pine Ecosystems.

Diplodia tip blight is the most ubiquitous and abundant disease in Spanish plantations. The economic losses in forest stands can be very severe because of its abundance in cones and seeds together with the low genetic diversity of the host. is not genetically diverse in North America either, and Diplodia shoot blight is a common disease.

Molecular characterization and phylogenetic analyses of needle pathogens (Rhytismataceae) on species in the USA and Europe.

Increasing prevalence of conifer needle pathogens globally have prompted further studies on pathogen identification and a better understanding of phylogenetic relationships among needle pathogens. Several species can be aggressive pathogens causing needle cast in natural pine forests in the USA and Europe. However, their relationships with other Rhytismataceae species have historically been based on similarities of only limited phenotypic characters.

Sap Beetles (Coleoptera: Nitidulidae) in Oak Forests of Two Northeastern States: A Comparison of Trapping Methods and Monitoring for Phoretic Fungi.

Oak wilt is slowly expanding in the northeastern United States. Several nitidulid beetle species are known vectors of the fungus [Bretziella fagacearum (Bretz) Z. W.

Emergence of white pine needle damage in the northeastern United States is associated with changes in pathogen pressure in response to climate change.

The defoliation of the eastern white pine (Pinus strobus) across the northeastern United States is an escalating concern threatening the ecological health of northern forests and economic vitality of the region's lumber industry. First documented in the spring of 2010 affecting 24 328 hectares in the state of Maine, white pine needle damage (WPND) has continued to spread and is now well established in all New England states. While causal agents of WPND are known, current research is lacking in both sampling distribution and the specific environmental factor(s) that affect the development and spread of this disease complex.

Impact of White Pine Blister Rust on Resistant Cultivated Ribes and Neighboring Eastern White Pine in New Hampshire.

To determine the impact of white pine blister rust (WPBR) following the recent breakdown of the Cr resistance dominant gene in cultivated Ribes spp., 255 plants of 19 Ribes cultivars and 445 neighboring eastern white pine (Pinus strobus) from 42 sites across New Hampshire were evaluated. Of the 19 Ribes cultivars evaluated, 15 were WPBR resistant, and 4 of these were labeled as black currant (Ribes nigrum) with the Cr gene (Cr Ribes cultivars).

Quantification of Conidia of Diplodia spp. Extracted from Red and Jack Pine Cones.

Frequency of detection and inoculum production by the conifer shoot blight and canker pathogens Diplodia pinea and D. scrobiculata on cones of red pine (Pinus resinosa) and jack pine (P. banksiana) were studied.