ISSN: 0041-3216

ISSN: 0041-3216 (Online), 0041-3216 (Print)
Volume 61 Number 2
Research Papers
Scanning electron microscopy of the colonization of cowpea (Vigna unguiculata (L.) Walp.) by host and nonhost Fusarium oxysporum
and
The extent of colonization of the vascular tissue of hypocotyls of two cultivars of cowpea (Vigna unguiculata (L.) Walp. by Fusarium oxysporum f.sp. tracheiphilum (Fot) and Fusarium oxysporum f.sp. phaseoli (Fop) is described. Co-infection with Sunn-hemp mosaic virus (SHMV) appeared to enhance the spread of the fungus in the vascular tissues. Deficiency of nitrogen appeared to diminish the spread of the fungus in the vessels of cowpeas infected with Fot or Fop alone but not in combination with SHMV.
Keywords: Fusarium oxysporum; Vigna unguiculata (L.) Walp.; Scanning electron microscopy: Viruses: Co-infection