Bacterial wilt of common bean caused by Curtobacterium flaccumfaciens pv. flaccumfaciens is an important disease in terms of economic importance. It reduces grain yield by colonizing xylem vessels, subsequently impeding the translocation of water and nutrients to the superior plant parts. The existence of physiological races in C. flaccumfaciens pv. flaccumfaciens has not so far been reported. ...

The black shank disease caused by Phytophthora nicotianae causes losses in tobacco crops up 100%. In Colombia, P. populations are poorly known causing wrong diagnostics and erratic management. Amplification of the Ypt1 gene morphological characteristics colonies, sporangia, chlamydospores hyphae were used to identify isolates. Races identified according reaction induced each isolate on differen...

Tan spot disease, which is caused by Pyrenophora tritici-repentis (Ptr), one of the most significant wheat diseases in Kazakhstan, an important wheat-growing region Central Asia. In this study, we aimed to investigate race composition Ptr responsible for tan Kazakhstan through phenotypic and genotypic characterization. During 2019–2020, samples isolates were collected analysis six regions Repub...

The genetic variability of seven European corn borer populations, Ostrinia nubilalis, from North America and Europe was assessed by polymerase chain reaction-restriction fragment length polymorphism (PCR-RFLP) analysis and DNA sequencing. The nuclear ribosomal internal transcribed spacer 1 (ITS-1) region (approximately 500 base pair [bp]) and four mitochondrial (mtDNA) regions (1550 bp total) w...

Physiological races of a fungal phytopathogen represent biotypes capable of attacking certain varieties of a susceptible host-species. Attempts to distinguish physiological races by other criteria have not yet been successful. On the other hand, strains of bacterial pathogens may often be identified using bacterial viruses (bacteriophage). Attempts to demonstrate a virus of a true fungus have n...

abstract to study virulence and molecular polymorphism variation of puccinia striiformis westend. f.sp.tritici eriks. (yellow rust disease agent) in iran, 86 isolates were collected from all around the country. race determination was carried out according to johnson et al. (1972) method. in addition, isolates were analyzed by aflp method by four primer combinations . according to the results of...