01732naa a2200241 a 450000100080000000500110000800800410001902200140006010000160007424501120009026000090020230000100021149000390022152010940026065000180135465000130137265000100138565300160139565300100141170000190142170000130144077300370145310402852019-06-12       2000    bl uuuu     u00u1 u    #d  a0031-949X1 aPEREYRA, S.  aSurvival and inoculum potential of Fusarium graminearum on wheat residues.[Resumen].h[electronic resource]  c2000  a10 p.  a(Publication no. P-2000-0427-AMA).  aWheat residue decomposition was related to survival and inoculum potential of Fusarium graminearum Schw. (F.g.), causal agent of wheat scab. Inoculated wheat residue was placed on the soil surface, at 7.5-10 cm and 15-20 cm deep in chisel plowed plots and 15-20 cm deep in moldboard plowed plots, in October 1997 at Crookston, MN. Residue was sampled from April through November, 1998 and 1999. Stem/node pieces (1.5-cm) were plated on PCNB agar and subsequently, colonies were transferred to carnation leaf agar to assess F.g. survival. Inoculum potential was assessed by ascospore counts from stem/node pieces incubated at 100% RH for perithecial formation. Buried residue decomposed faster than that on soil surface, and F.g. survival was inversely related to decomposition rate. F.g. colonization was significantly reduced by 8 mo. in the soil. Colonization of other Fusarium spp. increased over time. Ascospores of F.g. were still produced on some residue pieces after 23 mo. in/on soil. Data from this research may assist in developing effective management of F.g. infected residues.  aFITOPATOLOGIA  aFUSARIUM  aTRIGO  aHEAD BLIGHT  aWHEAT1 aDILL-MACKY, R.1 aSIMS, A.  tPhytopathologygv. 90:S60, 2000.