Fusarium sporotrichioides

[5] The genus Fusarium was first characterised by the German botanist Johann Link in 1809,[6] prior to the recognition of fungal involvement in plant disease.

[4] Lacking a satisfactory system of classification and identification with which to organise these many, seemingly similar Fusarium species, the mycologists Snyder and Hansen collected samples of various fusaria from laboratories worldwide, isolated single spores and cultured them for subsequent analysis of their genetic variation.

[8] More currently, the taxonomy of the genus Fusarium is studied using high-performance liquid chromatography, with each of the peaks on the resulting chromatograph being detected by a photodiode array and grouped into chromophore families.

[7] Members of this species have irregularly shaped, almost globular microconidia (referred to as subglobose), that are usually 5-7 μm in diameter, whilst their macroconidia are slightly curved and usually have three to five septa.

For example, the basal cells of macroconidia in some Fusarium species have hooks or notches whilst others do not,[14] but these differences are not always sufficient to distinguish closely related fusaria from one another.

[15] A feature unique to F. sporotrichioides compared to taxonomically related species is the presence of multiporous cells, known as polyphialides, which are now carefully considered in its identification.

[8] Over the past years, advances in molecular biology and the introduction of the polymerase chain reaction (PCR) have made the identification of Fusarium species a far more precise process.

[20] Although its formulation is now considered somewhat outdated,[20] PCNB has historically been useful for the rapid distinction between different Fusarium species in soil samples.

[2] F. sporotrichioides, along with F. poae and F. avenaceum also cause the discolouration of cereals such as oats, and several Fusaria have been shown to contribute to the rotting of certain fruits and vegetables in suboptimal storage conditions.

[7] F. sporotrichioides is one of the most common causative agents of head blight in Scandinavia, as well as Eastern and Northern Europe, although other species such as F. poae and F. avenaceum are usually more prevalent in these areas.

[2] All pathogenic Fusarium species produce mycotoxins as secondary metabolites, with the optimal conditions for toxin production being low temperatures, 5–8 °C (41–46 °F), darkness, and a slightly acidic environment (pH around 5.6).

[9] Other mycotoxins produced by F. sporotrichioides include butenolide, which causes mitochondrial damage in mammals and interferes with chlorophyll retention in plants, and moniliformin, which inhibits the citric acid cycle and consequently the breakdown of carbohydrates.

[3][4] ATA has a notably severe pathology and significantly different clinical manifestations in comparison to other mycotoxicoses, including immune suppression, necrosis, and hemorrhaging from the throat, nose, and skin.

[24] Although Snyder and Hansen classified the causative agent of the outbreak as F. tricinctum, the mycotoxicologist Abraham Joffe identified it as F. sporotrichioides, a conclusion supported by several sources.

[25] Considering the fact that Fusarium diseases jeopardize crop viability as well as releasing potentially hazardous mycotoxins, their management and control is relevant to agriculture and public health.

Irrigation control can also significantly limit water-mediated dispersion of pathogenic Fusarium species, ultimately reducing the likelihood of crop contamination.