Abstract: In 1988, a nuclear polyhedrosis virus of Parocneria orienta Chao was isolated in Nanping, Fujian Province, China,by scanning electron microscopy. It was shown that the inclusion body was a hexahedron, with a diameter of 0.61-2.69 μm. The virus was singly embedded rod-shaped, with a size of 48—72×320—376 nm. The LC50 values for early second-instar to fifth-instar larvae were 5.455 × 10⁴, 2.036×10⁵ 2.933 × 10⁵ and 1.438 × 10⁶ PIB/ml, respectively. The LT50 decreased with the increasing virus concentration.

Key words: Nuclear polyhedrosis virus, Parocneria orienta, bioassay