Phylogeographic and Phylogenomic Structure of the Quarantine Plant Pathogen , Including New Reports in the United States.

Global agricultural trade has accelerated the emergence and re-emergence of new plant pathogens. In the United States, the fungal pathogen is still considered a foreign quarantine pathogen that affects ornamental plants (i.e.

, sp. nov., a new downy mildew species infecting the endangered Hawaiian plant var. .

var. is an endangered native Hawaiian plant, and part of the recovery plan includes repopulation using plants grown in a nursery. However, disease pressure from downy mildew is hindering repopulation efforts.

Phylogeny and taxonomy of , sp. nov., and sensu lato.

Powdery mildew of spp. is a significant disease in most cherry growing regions of Washington, USA. Powdery mildews on and were previously assigned to s.

Entyloma helianthi: identification and characterization of the causal agent of sunflower white leaf smut.

White leaf smut is a minor foliar disease of sunflower (Helianthus annuus) in the United States. The disease occurs primarily in greenhouse-grown sunflowers in California and causes leaf spot, defoliation, and a reduction in yield and crop value. Historically, many Entyloma specimens with similar morphological characters, but infecting diverse plant genera including Helianthus, were called Entyloma polysporum.

Overlooked competing asexual and sexually typified generic names of with recommendations for their use or protection.

With the change to one scientific name for fungal species, numerous papers have been published with recommendations for use or protection of competing generic names in major groups of ascomycetes. Although genera in each group of fungi were carefully considered, some competing generic names were overlooked. This paper makes recommendations for additional competing genera not considered in previous papers.

Microcyclic rusts of hollyhock ( Alcea rosea ).

Rust fungi infecting hollyhock and other plants in Malveae are frequently intercepted at ports of entry to the USA, particularly Puccinia malvacearum and P. heterogenea. These two species can be difficult to distinguish and can be further confused with other, less common species of microcyclic rust fungi infecting hollyhock: P.