oa African Entomology - Development of Nosema parlelli sp. n. (Protozoa: Microsporida: Nosematidae) in the stem borer Chilo parlellus (Swinhoe) (Lepidoptera: Pyralidae)

Volume 1, Issue 1
  • ISSN : 1021-3589



The development of a new species of Nosema (N. partelli sp. n.) from the spotted stem borer, Chilo partellus (Swinhoe), is descriptionbed. The microsporidia infect eggs, all larval stages and moths of both sexes of the borer. Infection of the eggs implies that transovarial transmission occurs. Spores of constant size are produced, meronts are mainly binucleated but may contain up to eight nuclei. resporoblastic meronts are single structures, there are no linear or colony formations. Individual diplokaryotic sporoblasts are chromophilic, and slight overstaining produces almost black spherical and oval structures. The diplokaryotic nucleus is characterized by an achromatic line less than 1m in width which divides it through its centre. This characteristic does not occur in other species of Nosema and is unique to N. partelli. It occurs through all developmental stages from the diplokaryotic sporoblast to the encysting spores. Sporogony is heralded by spindle-shaped diplokaryotic sporoblasts. Diplokaryotic sporonts decrease in size, their nuclei tend to become smaller and pyknotic, after which visible detail is lost following encystment.

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