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Surveillance of the Disease Incidence and Severity of Papaya Ringspot Virus at Four Selected Districts of Bangladesh

F. Begum*
Department of Plant Pathology, Sher-e-Bangla Agricultural University, Dhaka-1207, Bangladesh

N. Chakma
Department of Plant Pathology, Sher-e-Bangla Agricultural University, Dhaka-1207, Bangladesh

M.B. Hossain
Department of Plant Pathology, Sher-e-Bangla Agricultural University, Dhaka-1207, Bangladesh

A.H.Anik
Department of Plant Pathology, Sher-e-Bangla Agricultural University, Dhaka-1207, Bangladesh

J. Lee
University of Victoria, Victoria BC-V8P 5C2, CANADA

N. N. Tonu
Department of Plant Pathology, Sher-e-Bangla Agricultural University, Dhaka-1207, Bangladesh

Abstract/ Executive Summary:

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 most popular fruits in the world. It suffers from several diseases including fungi, bacteria, nematodes and viruses. Among them, viral diseases are found to cause considerable yield loss, with the most important one being PRSV. The survey was conducted at three plain districts and one hill tract area from July 2016 to December 2016. During the survey period, six different symptoms were found in the selected fields and were identified as PRSV based on symptomology. These symptoms were mild mosaic (MM), mosaic (MO), severe mosaic (SM), fern leaf (FL), leaf distortion (LD) and vein clearing (VC). The highest disease incidence (36.24%) was found in BSMRAU farm in Gazipur whereas the lowest (12.04%) was found in Panchari, Khagrachari hill tract. The maximum severity (11.53%) was found in BSMRAU campus, Gazipur on the country and the lowest severity (2.50%) was found in Panchari, Khagrachari hill tract. The yield and yield contributing parameters of papaya found to be differ significantly among the surveyed area. The lowest fruit weight (324.3 gm) due to PRSV infection was recorded in BSMRAU, Gazipur while the highest fruit weight (643.6 gm) was conducted in SAU Campus, Dhaka

Keywords: Survey, Disease incidence, Disease severity, PRSV, Selected districts, Bangladesh.

Location: Four districts in Bangladesh

Start Date: 00-07-2016

End Date: 00-12-2016

Program Area: Pest Management

Commodity: Virus, Papaya

Objectives:

(i) to conduct a survey on PRSV disease in papaya field at selected locations of Bangladesh; (ii) to quantify the effect of PRSV disease on the growth and yield contributing parameters of papaya; and (iii) to know the reduction of growth and yield parameters of papaya due to PRSV infection.

Methodology:

2.1 Selection of the survey area: The experiment was conducted to survey the incidence and severity of Papaya ringspot virus-papaya strain (PRSV-P) on the basis of symptoms in the field. The survey was conducted at eight locations of four districts in Bangladesh. 2.2 Survey period: Eight surveys were conducted during the period from 25 May 2016 to 14 December 2016. 2.3 Observation of the symptoms: Symptoms of the disease PRSV was identified by visual observation described by Jensen (1949a), Conover (1964), Gonsalves (1997), Akanda (1991) and Rezende et al. (1995), Rahaman (2003), Akhter and Akanda (2008). 2.4 Selection of Plants: During the survey, twelve plants were selected randomly in each location with four plants in one replication, resulting in three replications from each location. Following the procedure, twenty-four replications were selected from eight locations in four districts. 2.5 Determination of the disease incidence and severity: Every plant in the field was counted to determine the disease incidence and severity. Then it was expressed in percentage.

Source of Information: International Journal of Environment, Agriculture and Biotechnology (IJEAB) Vol-3, Issue-6, Nov-Dec- 2018

Article Link (Online Journal): http://dx.doi.org/10.22161/ijeab/3.6.16 ISSN: 2456-1878

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

Papaya (Carica papaya L.) is a very important fruit all over the world and though its demand is increasing day by day, the production of papaya is not satisfactory. The present experiment was designed to study the surveillance and identification of PRSV disease based on symptomology and to observe the disease incidence and severity of PRSV at eight locations of four districts in Bangladesh. In the survey period among the eight locations, the highest incidence was found at BSMRAU (36.24%) and lowest at Panchari (12.04%). In the case of severity, the maximum severity was found at BSMRAU (11.53%) and minimum was recorded at Panchari (2.50%), BADC (3.057%) and Narayanganj Sadar (3.443%). In the selected locations, the growth parameters were also recorded, including plant height, leaf number, petioles length and leaf blade area. There were significant differences found in different growth parameters at different locations. The highest number of fruit was harvested from BSMRAU campus (6.167) as yield parameters and the lowest number was found at JU and Panchari (4.583). Significant variations also found in percent reduction of growth and yield parameters. From the findings of the study, it may be concluded that the disease incidence and severity and its effects on growth, yield, and yield parameters varied significantly in the surveyed areas by the infection of PRSV in papayas the lowest incidence and severity was found at Panchari (Hill tract area). The farmer may be suggested to cultivate papaya in that region. However, further study need to be continued to have information prissily.

Knowledge Management: Journal