ABSTRACT Almond leaf scorch disease (ALSD) has recently reemerged in the San Joaquin Valley of California threatening almond production. ALSD is caused by Xylella fastidiosa, a nutritionally fastidious bacterium. Single nucleotide polymorphisms (SNPs) in the 16S rRNA gene (16S rDNA) of X. fastidiosa strains were identified to characterize the bacterial population in infected trees. Genotype-spe...

The population structure and genetic diversity of Citrus leaf blotch virus (CLBV) were estimated by single-strand conformation polymorphism and nucleotide sequence analyses of two genomic regions located within the replicase (R) and the coat protein (C) genes. Analysis of 30 cDNA clones of each genomic region from two CLBV isolates showed that both isolates contained a predominant haplotype and...

Wild and cultivated Basidiomycetes species were cultured to determine the distribution of bacteria causing brown blotch disease of Agaricus bisporus. Colonies from each basidiocarp were screened for brown blotch organisms by the white line and host pathogenicity tests. Isolates causing brown blotch were identified as Pseudomonas tolaasi and an Arthrobacter species.

Raspberry leaf blotch virus (RLBV) is a new member of the Emaravirus genus (Fimoviridae, Bunyavirales). Representatives this family are characterized by segmented "-" RNA genome, helical nucleocapsid and enveloped spherical or pleomorphic virions 80-120nm in diameter. Transmission these viruses carried out eriophyid mites. The widely distributed Europe. In paper, phylogenetic relationships betw...

The genetic diversity among 56 almond (Prunus dulcis) genotypes was analysed using 35 microsatellite markers and 14 morphological traits. Analysis of morphological traits revealed a wide range of variation among the studied genotypes. Out of 35 simple sequence repeats (SSRs) markers, 25 were polymorphic, producing 215 alleles that varied from 2 to 16 with an average of 8.76 alleles per locus. R...

Peyronellaea arachidicola is the causal agent of peanut (Arachis hypogaea L.) web blotch. Here, we report an assembled draft genome sequence P. strain YY187 obtained from symptomatic leaf in China. The size 47.3 Mb, consisting 26 contigs (N 50 = 2.2 Mb) with G+C content 56.37%. This will provide a valuable foundation for further research on genetics and comparative genomics arachidicola.

In an abstract ^ published in 1922 the writer reported the widespread occurrence on Kentucky bluegrass {Poa pratensis L.) of a leaf spot caused by a species of Helminthosporium. Often, especially in moist situations, the lesions had been found on the leaf sheaths at the base of the plants as well as on the blades, giving rise to a condition comparable to foot rot of wheat. A brief account of th...

Sisterson, M. S., Ledbetter, C. A., Chen, J., Higbee, B. S., Groves, R. L., and Daane, K. M. 2012. Management of almond leaf scorch disease: Long-term data on yield, tree vitality, and disease progress. Plant Dis. 96:1037-1044. Almond leaf scorch disease (ALSD) has been a chronic problem for California almond growers. This disease is caused by the bacterial pathogen Xylella fastidiosa and is tr...