First Report of Narcissus late season yellows virus, Narcissus latent virus, and Narcissus mosaic virus in daffodil (Narcissus pseudonarcissus) in the United States.

Daffodils (family , genus ) are important ornamental plants produced primarily for cut flowers. In 2019, daffodils sales in the US were $6.26 M (USDA-NASS, 2019).

Deciphering the biology of Cryptophyllachora eurasiatica gen. et sp. nov., an often cryptic pathogen of an allergenic weed, Ambrosia artemisiifolia.

A little known, unculturable ascomycete, referred to as Phyllachora ambrosiae, can destroy the inflorescences of Ambrosia artemisiifolia, an invasive agricultural weed and producer of highly allergenic pollen. The fungus often remains undetectable in ragweed populations. This work was conducted to understand its origin and pathogenesis, a prerequisite to consider its potential as a biocontrol agent.

Thrips Settling, Oviposition and IYSV Distribution on Onion Foliage.

Thrips tabaci Lindeman (Thysanoptera: Thripidae) adult and larval settling and oviposition on onion (Allium cepa L.) foliage were investigated in relation to leaf position and leaf length at prebulb plant growth stages under controlled conditions. In the laboratory, four and six adult females of T.

Redescription of Robustodorus megadorus with Molecular Characterization and Analysis of Its Phylogenetic Position within the Family Aphelenchoididae.

Based on a new record of the rare species Robustodorus megadorus from Utah, the generic diagnosis was amended to include the following characters: a labial disc surrounded by six pore-like sensilla; the absence of a cephalic disc; a lobed cephalic region devoid of annulation; a hexagonal inner cuticular structure of the pouch surrounding the stylet cone; large stylet knobs, rounded in outline and somewhat flattened on their lateral margins; a large spermatheca with an occluded lumen and lacking sperm; the excretory pore located between the median bulb and nerve ring. The stylet orifice consists of an open, ventral, elongate slit or groove. These characters distinguish the genus from the closely related genus Aphelenchoides.

Occurrence of Meloidogyne fallax in North America, and Molecular Characterization of M. fallax and M. minor from U.S. Golf Course Greens.

Several species of root-knot nematodes (Meloidogyne spp.) are known to have significant presence on turfgrass in golf course greens, particularly in the western United States. Nematodes isolated from a golf course in King County, WA were identified as Meloidogyne minor based on analysis of the large ribosomal subunit (LSU 28S D2-D3 expansion segment), the internal transcribed spacers 1 and 2 (ITS rDNA), the intergenic spacer region 2 (IGS2), and the nuclear protein-coding gene Hsp90.

Root-Knot Nematodes in Golf Course Greens of the Western United States.

A survey of 238 golf courses in 10 states of the western United States found root-knot nematodes (Meloidogyne spp.) in 60% of the putting greens sampled. Sequence and phylogenetic analyses of 18S rRNA, D2-D3 of 28S rRNA, internal transcribed spacer-rRNA, and mitochondrial DNA gene sequences were used to identify specimens from 110 golf courses.

Host specialization of the mycoparasite Eudarluca caricis and its evolutionary relationship to Ampelomyces.

Eudarluca caricis is assumed to be a nonspecific mycoparasite of rust fungi. The evidence for its mycoparasitism has rested on constant association with uredinia. In this study, stable isotopes provided additional evidence of mycoparasitism, as E.