Tip Burn by Bipolaris leersiae (Atk.) Shoem. (=Helminthosporium oryzae) of Rice and its Sporulating Ability in India

Abstract

The first (34.52%) and the second (29.76%) leaves of rice seedlings showed typical tip burn symptom progressing downward, which eventually ran the entire leaf length, resulting in early senescence. In vivo sporulation was greater from freshly developed lesion, so the primary tip burn lesion developed on seedlings can serve as an efficient means and immediate source of secondary infection. Two semiaxial germ tubes from a single polar cell and frequent germination of intercalary cells along with the two polar cells were also noted.