Detection and phylogenetic relationships of Puccinia emaculata and Uromyces graminicola (Pucciniales) on switchgrass in New York State using rDNA sequence information.

The species of rust fungi (Pucciniales) inciting disease on switchgrass (Panicum virgatum) grown in bioenergy feedstock systems across the north-central and eastern United States remain unclear. In the present study, the species number and phylogenetic relationships of rust species affecting switchgrass were examined in 2011-2013 at two sites in New York State as well as selected sites in Alabama, Iowa, Nebraska, Pennsylvania, South Dakota, and West Virginia using ribosomal RNA gene data (partial internal transcribed spacer [ITS] 1, complete 5.8 subunit [S] and ITS2, and partial 28S).

Genetic evidence for three discrete taxa of Melampsora (Pucciniales) affecting willows (Salix spp.) in New York State.

Rust fungi in the genus Melampsora (Pucciniales) are the most important pathogens of shrub willows (Salix spp.) cultivated for biomass in New York State and temperate regions worldwide. The taxonomy and species identification of these fungi historically have been problematic as they are morphologically indistinguishable on willow and often have complex life histories.

Aggressiveness of Phytophthora cactorum, P. citricola I, and P. plurivora from European Beech.

Phytophthora cactorum, P. citricola I, and P. plurivora cause bleeding cankers on mature European beech (Fagus sylvatica) trees in the northeastern United States.

Effects of Mefenoxam, Phosphonate, and Paclobutrazol on In Vitro Characteristics of Phytophthora cactorum and P. citricola and on Canker Size of European Beech.

Phytophthora citricola and P. cactorum cause bleeding cankers that lead to the death of mature European beech (Fagus sylvatica) in the northeastern United States. The effects of two fungicides and a plant growth regulator on in vitro pathogen characteristics and on canker expansion were investigated.