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Evaluation of Okra Varieties Resistant to Okra Yellow Vein Mosaic Virus (okyvmv)

M.S. RAHMAN
Plant Pathology Division, BARI, Gazipur

Abstract/ Executive Summary:

Okra (Abclmoschus esculentus) is an important commercial vegetable crop grown throughout the world. It is commonly known as a ladyfinger. Okra yellow vein mosaic virus (OYVMV) is a major and devastating pathogen of Okra, significantly lowers the yield up to 94%. Nineteen varieties/cultivars were screened against OYVMV during the year of 2020. Out of 19 varieties/lines, two varieties/lines (OK-12 and OK-19) showed a resistant response against the virus. Four varieties/lines (OK-03, OK-05, OK-06 and OK-18) showed a tolerant reaction against OYVMV. OK-02, Ok-04, OK-13, OK-15, OK-16 and OK-17 showed moderately susceptible reactions against the virus. OK-09, OK-11 and OK-14 fall under the category of susceptible. for three varieties/lines OK-07, Ok-08 and Ok-10 came out as highly susceptible.

Keywords: Okra, OYVMV, Whitefly

Location: Plant Pathology Division, Bangladesh Agricultural Research Institute (BARI), Joydebpur, Gazipur

Start Date: 00-00-2018

End Date: 00-00-2019

Program Area: Pest Management

Commodity: Virus

Objectives:

The objective of this study was to evaluate different okra cultivars against OYVMV under field condition.

Methodology:

The experiment was conducted in the research field of Plant Pathology Division, Bangladesh Agricultural Research Institute (BARI), Joydebpur, Gazipur during 2018-19. The experiment was laid out in randomized complete block design (RBD) with three replications. The treatments were applied to the plots randomly in each block. The plot size was 2.5 × 2.0 m². Fourteen varieties (BARI-1, BARI-2, OK-86, OK-122, OK-05, OK-06, OK-07, Ruposhi, Hi-choice, OK-285, Sabujsathi, Indian, Kochi and Shamoli)were used as treatment. Row to row and plant to plant distance was maintained at 50 cm. The conventional agronomic practices were followed to keep the crop in good condition. The okra germplasm was subjected to natural viral inoculum, invasion and buildup of whitefly (B. tabaci) population density. The disease severity was assessed by following the disease rating scale described by Ali et al. (2005).

Rating Scale Severity Range (%)

0- Immune 0 %

1- Resistant 1-10%

2- Moderately Resistant 11-25%

3- Tolerant 26-50%

4- Moderately Susceptible 51-60%

5- Susceptible 61-70%

6- Highly Susceptible 71-100%

Source of Information: Annual Research Report 2019-20, Plant Pathology Division, BARI, Gazipur

Article Link (Online Journal):

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

From the above study, two of the varieties/lines were found resistant (OK-12 and OK-19) and four varieties/lines (OK-03, OK-05, OK-06 and OK-18) showed tolerant reaction against OYVMV. However, further evaluation is needed including more germplasm to find out durable resistant sources of Okra against OYVMV

Knowledge Management: Report/Proceedings