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Ramu stunt is a serious disease of sugarcane, currently only reported from Papua New Guinea. It is found in both commercial sugarcane grown on the Ramu Agri Industries Limited (RAIL) estate and in chewing canes (Saccharum officinarum L.) grown in village gardens. The vector of Ramu stunt disease is the island sugarcane planthopper, Eumetopina flavipes Muir. Here we report on the successful transmission of Ramu stunt using E. flavipes and verify that the disease is caused by Ramu stunt virus, a virus with homology to the genus Tenuivirus. Diagnostic reverse transcription PCR screening, with partial genome sequencing and viral protein characterization, was used for confirmation. Disease surveys were undertaken on the RAIL estate, along roadsides, and in village gardens in parts of Papua New Guinea. When the disease was identified, partial genome sequencing of the virus was performed to assess the extent of genome variability among isolates. The disease was less common than predicted from early surveys based on symptoms alone, and genotypic variation was associated with geographic location.

Planthopper Transmission of Ramu Stunt Virus, a Tenuivirus Causing the Sugarcane Disease Ramu Stunt, and its Distribution in Papua New Guinea