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.

Gene Expression Analysis of Three Putative Copper-Transporting ATPases in Copper-Tolerant .

Copper tolerance of brown-rot basidiomycete decay fungi can lessen the efficacy of copper-containing wood preservatives for wood products in-service. The purpose of this study was to evaluate wood mass loss and differential expression of three genes that have putative annotations for copper-transporting ATPase pumps (FIBRA_00974, FIBRA_04716, and FIBRA_01430). Untreated southern pine (SP) and SP treated with three concentrations of ammoniacal copper citrate (CC, 0.

A Nonwounding Greenhouse Screening Protocol for Prediction of Field Resistance of Hybrid Poplar to Septoria Canker.

Populus spp. and their hybrids are short-rotation woody crops which supply fiber to a diversity of industries in North America. The potential of hybrid poplar trees has been limited by the fungal pathogen Septoria musiva, the cause of leaf spot and stem canker of Populus spp.

Physiological performance of an Alaskan shrub (Alnus fruticosa) in response to disease (Valsa melanodiscus) and water stress.

• Following the decades-long warming and drying trend in Alaska, there is mounting evidence that temperature-induced drought stress is associated with disease outbreaks in the boreal forest. Recent evidence of this trend is an outbreak of Cytospora canker disease (fungal pathogen Valsa melanodiscus (anamorph = Cytospora umbrina)) on Alnus species. • For Alnus fruticosa, we examined the effects of water stress on disease predisposition, and the effects of disease and water stress on host physiology.

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.

Genetic Structure of Mycosphaerella populorum (Anamorph Septoria musiva) Populations in North-Central and Northeastern North America.

ABSTRACT In order to characterize the genetic variation of the poplar pathogen Mycosphaerella populorum (anamorph Septoria musiva), we have studied seven North American populations using the polymerase chain reaction random amplified polymorphic DNA (RAPD) technique. The fungal populations were sampled in 2001 and 2002 by obtaining 352 isolates from cankers and leaf spots in hybrid poplar plantations and adjacent eastern cottonwood (Populus deltoides). A total of 21 polymorphic RAPD markers were obtained with the six RAPD primers used.

The Histology of Hybrid Poplar Clones Inoculated with Septoria musiva.

Septoria musiva causes stem cankers that severely limit production of susceptible hybrid poplars in eastern North America. A field experiment was conducted with resistant clone DN34 and susceptible clone NC11505 in order to (i) identify tissues colonized by the pathogen, (ii) describe tissue responses to S. musiva, and (iii) determine whether tissue responses to S.

Species diversity of polyporoid and corticioid fungi in northern hardwood forests with differing management histories.

Effects of forest management on fungal diversity were investigated by sampling fruit bodies of polyporoid and corticioid fungi in forest stands that have different management histories. Fruit bodies were sampled in 15 northern hardwood stands in northern Wisconsin and the upper peninsula of Michigan. Sampling was conducted in five old-growth stands, five uneven-age stands, three even-age unthinned stands and two even-age thinned stands.

A Species-Specific PCR Assay for Detection of Diplodia pinea and D. scrobiculata in Dead Red and Jack Pines with Collar Rot Symptoms.

A polymerase chain reaction (PCR)-based assay was developed for the specific detection of the fungal pathogens Diplodia pinea and D. scrobiculata from pine host tissues. Variation among mitochondrial small subunit ribosome gene (mt SSU rDNA) sequences of Botryosphaeria species and related anamorphic fungi was exploited to design primer pairs.

Specific and sensitive PCR-based detection of Septoria musiva, S. populicola and S. populi, the causes of leaf spot and stem canker on poplars.

The development of a PCR assay for the detection of the poplar pathogenic fungi Septoria musiva (teleomorph Mycosphaerella populorum), S. populicola (M. populicola) and S.

Prediction of Long-Term Canker Disease Damage from the Responses of Juvenile Poplar Clones to Inoculation with Septoria musiva.

Stem cankers caused by Septoria musiva severely limit production of susceptible hybrid poplars in eastern North America. A field experiment was conducted to determine whether short-term responses of poplar stems to inoculation with S. musiva were predictive of long-term canker disease damage.

Differentiation of a Fusicoccum sp. Causing Panicle and Shoot Blight on California Pistachio Trees from Botryosphaeria dothidea.

A panicle and shoot blight disease of pistachio trees in California is caused by a fungus previously identified as the anamorph of Botryosphaeria dothidea. We have compared random amplified polymorphic DNA (RAPD) markers, nuclear rDNA internal transcribed spacer (ITS) region sequences, and conidium morphology of 15 isolates of the pistachio Fusicoccum to those of well-characterized isolates of B. dothidea, B.