Photo 2. Leaves showing yellow streaks (2-5 mm wide) along the blade, typical of Ramu stunt disease on susceptible varieties of sugarcane.
Ramu stunt disease
Sugarcane Ramu stunt disease. Initially, the cause of the disease was thought to be a virus; later, phytoplasmas were detected (related to sugarcane white leaf phytoplasmas) in diseased plants and also in planthoppers (Eumetopina flavipes), which may spread the disease. More recently, a virus has again been suggested. Advanced RNA sequencing techniques may have found a virus belonging to the Tenuivirus group.
AUTHOR Grahame Jackson
Information from Ramu stunt (2013) Sugar Research Australia. Information sheet IS1 3090. (http://www.sugarresearch.com.au/icms_docs/164677_Ramu_stunt_IS13090.pdf); and from CABI (2015) Sugarcane Ramu stunt disease (Ramu stunt disease). Crop Protection Compendium (www.cabi.org/cpc). Photos 1&2 Braithwaite KS (2010) Ramu stunt. PaDIL - (http://www.padil.gov.au). Photos 3&4 Bellis G, Fletcher M (2011) Island Sugarcane Planthopper (Eumetopina flavipes). PaDIL - (http://www.padil.gov.au).
Produced with support from the Australian Centre for International Agricultural Research under project PC/2010/090: Strengthening integrated crop management research in the Pacific Islands in support of sustainable intensification of high-value crop production, implemented by the University of Queensland and the Secretariat of the Pacific Community.
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