Infection conditions of Fusarium graminearum in barley are variety specific and different from those in wheat

Abstract

Fusarium head blight is one of the most noxious cereal diseases. Worldwide, F. graminearum (FG) and the mycotoxin deoxynivalenol (DON) is the most dominant species/mycotoxin in barley and wheat. Barley is often produced as on farm feed and thus routine mycotoxin analyses similar to those of cereals for human consumption are not performed. Hence, an early prediction of mycotoxin levels is important for farmers to minimise the risk of contaminated feed but also of contaminated cereals entering the cereal supply chain. Therefore, climate chamber experiments with artificial FG infection of barley investigating the influence of different temperatures (10°C, 15°C, 20°C) and durations (4 h, 8 h, 12 h) at 99% relative humidity were conducted to accumulate data to develop a forecasting system. An up to three times higher DON contamination in the 15°C treatments for the feed barley variety Ascona was detected compared with the 10°C and 20°C treatments. For the malting barley variety Concerto, the prolonged humidity durations had a stronger effect under all tested temperatures and resulted in up to two times higher DON contaminations. In addition, field experiments where spore deposition during anthesis as well as disease incidence, fungal amount and mycotoxins were observed, showed that the overwintered straw treatment resulted, depending on the year, in a three times higher FG incidence and DON content compared with the control and freshly inoculated straw treatment.

Influence of temperature, humidity duration and growth stage on the infection and mycotoxin production by Fusarium langsethiae and Fusarium poae in oats

“…In addition, it is currently not known whether there are teleomorphs of FL and FP and whether these are actively discharged; hence, the sampling method was probably not suitable for these asexually produced conidia. However, as shown for barley (Schöneberg et al ., ), the sampling method was suitable for observation of the flight and deposition of FG spores. Thus, other sampling methods, such as automatic Multi‐Vial samplers, as used by Hofgaard et al .…”

Can plant phenolic compounds reduceFusariumgrowth and mycotoxin production in cereals?

“…The inoculum used for the inoculation of different oat varieties was prepared as described by Vogelgsang et al (2008) with modifications described by Schöneberg et al (2018b). In brief, seven day old FL cultures were grown on potato dextrose agar (PDA; Oxoid, Basingstoke, UK) and conidia were washed from the plates with 0.0125% Tween ® 20 (Sigma-Aldrich, Darmstadt, Germany) and adjusted to a final concentration of 2 × 10 6 conidia ml −1 .…”

Mapping of quantitative trait loci for traits linked to fusarium head blight in barley

“…DON levels present in barley (Hordeum vulgare L.) and wheat (Triticum aestivum L.) infected with FHB vary according to the time of infection and environmental factors. It is well known that infection is favored by moist and warm conditions [7,8]. While the presence of scab can be determined through visual inspection, the presence of DON cannot.…”