Colonization of the Residues of Diverse Plant Species by Gibberella zeae and Their Contribution to Fusarium Head Blight Inoculum

Abstract

The presence of Fusarium spp. was examined in the residues of wheat, barley, corn, sunflower, pasture, and gramineous weed species common in wheat and barley cropping systems collected from no-tillage and reduced-tillage plots from February 2001 to March 2003 in Uruguay. Gibberella zeae was recovered from residues of wheat, barley, corn, sunflower, fescue, and the gramineous weeds Digitaria sanguinalis, Setaria spp., Lolium multiflorum, and Cynodon dactylon, except from birdsfoot trefoil or white clover. Of the Fusarium spp. obtained, G. zeae was the most frequently recovered from wheat and barley residues, while other species were more common in other crops. G. zeae declined over time in all residues examined. Wheat and barley residues produced more ascospores of G. zeae than corn or other gramineous residues. Sunflower residue did not support ascospore production, indicating that it probably did not contribute to primary inoculum. Wheat and barley residues supported G. zeae colonization longer in no-till than in reduced-tillage production systems and, thus, may represent major contributors to Fusarium head blight (FHB) inoculum in Uruguay. The presence of G. zeae in the gramineous components of pastures, weed species, and sunflower should be considered when implementing control strategies for FHB.

Toxigenic Fusarium species infecting wheat heads in Poland

“…graminearum has an epidemiological advantageit is able to produce perithecia and release ascospores. The production of ascospores is only possible when the soil moisture content is between 30% and 80%, and temperatures between about 7-10 and 15-20°C [11]. Fungi-colonized crop debris is one of the main sources of inoculum, as it provides a substrate for abundant sporulation during the next growing season.…”

Integrated strategies for the control of Fusarium head blight and deoxynivalenol contamination in winter wheat

“…FHB 15 epidemics are supported by cropping systems that leave high amount of crop debris 16 on the soil surface (Pereyra and Dill-Macky, 2008;Blandino et al, 2010) and 17 pathogens survive longer on residues that do not degrade easily, such as stem 18 nodes or stalks (Sutton, 1982). Thus, FHB disease and DON contamination are more…”

Molecular Phylogenetic Identification of Plant-pathogenic Fungi Isolated from Two Medicinal Atractylodes macrocephala Koidz Species

“…In this study, two Plant-pathogenic fungal isolates of morphological were isolated from stems and roots of A.macrocephala. G. zeae is common Plant-pathogenic fungal in many species (Lee et al, 2009, Pereyra andDill-Macky, 2008) and we reported the phylogenetic significance of morphological character in the taxonomy of G. zeae species. However, F. lateritium is the dominant Pathogenic fungi firstly detected in A. macrocephala.…”