SURVEILLANCE ON DISEASE INCIDENCE AND SEVERITY OF Papaya ringspot virus AT SELECTED LOCATIONS OF BANGLADESH

Abstract

An experiment was conducted to survey the prevalence of disease incidence and severity of Papaya ringspot virus (PRSV) at eight locations of four districts in Bangladesh. Papaya is one of the popular fruit in the whole world. It suffers from several diseases and the causal organisms are fungi, bacteria, nematodes and viruses. Among them, viral diseases are found considerable yield loss and the most important one is PRSV-P. The survey was conducted from July 2016 to December 2016. Three plain districts and one hill tract area were selected for the survey. Six different symptoms were found in the selected field which was identified as PRSV based on symptomology. Symptoms were mild mosaic (MM), mosaic (MO), severe mosaic (SM), fern leaf (FL), leaf distortion (LD) and vein clearing (VC). The highest incidence (36.24%) was found in BSMARU farm in Gazipur and the lowest (12.04%) was found in Panchari, Khagrachari hill tract. The maximum severity (11.53%) was found in BSMARU campus, Gazipur and the lowest severity (2.50%) was found in Panchari, Khagrachari hill tract. The yield contributing parameters and yield of papaya found to be different significantly among the surveyed area. The lowest fruit weight (324.3 gm.) due to PRSV-P infection was recorded in BSMARU, Gazipur while the highest fruit weight (643.6 gm.) was conducted in SAU Campus, Dhaka.