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Role of Nosema bombycis infected male silk moths in the venereal transmission of pebrine disease in Bombyx mori (Lep., Bombycidae)

Abstract: The role of male moths of silkworm in the spread of pebrine spores (disease) has been studied using appropriate crossings and examining the multiplication of spores in the testis. Sections of infected testis reveal the presence of spores in the peritoneal sheath, spermatids but not in the sperm. A large number of spores was observed in the bursa copulatrix of the uninfected female moth mated with an infected male moth. This is a first record of venereal transmission of pebrine spores in silkworms. Venereally transmitted spores do not contribute to transovarial transmission, but give a false positive indication during mother‐moth examination. An alternative method for mother‐moth testing has also been discussed.