Management of Okra Yellow Vein Mosaic Virus (OYVMV) Through Selected Insecticides and Light Reflecting Colored Mulches

A field experiment was conducted to evaluate the effect of light reflecting colored mulches and only one time spraying with selected insecticides to control the insect vector of Okra Yellow Vein Mosaic Virus (OYVMV) whitefly (Bemisia tabaci) at the central farm of Sher-e-Bangla Agricultural University, Dhaka-1207. The experiment was carried out in three blocks layouted with RCBD comprising eight treatments viz. T0 (control/no spray), T1 (1 time spray with imitaf), T2 (1 time spray with protect), T3 (1 time spray with tiddo plus), T4 (1 time spray with terbine), T5 (light reflecting silver color mulch), T6 (light reflecting red color mulch) and T7 (light reflecting black color mulch) with three replications. The mulches were used before sowing and insecticides were sprayed at 30 DAS. It was observed that among the light reflecting colored mulches, the lowest disease incidence (11.48%) was recorded in the plots which mulched with red color mulch (T6). Among the insecticides, the lowest disease incidence (30.17%) was recorded in plots that was sprayed with terbine (one time). Yield and yield contributing characters, morphological and physiological features of okra plant that changes due to disease infection which cause damages in okra production and reduce the fruit quality as well as market value was also the part of this study. Yield and yield contributing characters showed significant variance among the selected treatments. In the relationship study, it was noticed that the yield and plant height was showed negative relationship with disease incidence. However, considering all measuring parameters, spraying with terbine (one time) and used red color mulch may be recommended as good management approaches that will give higher okra production and lower disease incidence of Okra Yellow Vein Mosaic Virus (OYVMV).

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Genetic analysis of Okra Yellow Vein Mosaic Virus disease resistance in wild relative of okra Abelmoschus angulosus Wall. ex Wight & Arn

Plant Genetic Resources ◽

10.1017/s1479262119000078 ◽

2019 ◽

Vol 17 (04) ◽

pp. 346-351

Author(s):

SamanthiKumari Wasala ◽

Sumudu I. Senevirathne ◽

Jayantha Bandara Senanayake ◽

Anuradini Navoditha

Keyword(s):

Disease Resistance ◽

Mosaic Virus ◽

Disease Severity ◽

Virus Disease ◽

Disease Incidence ◽

Severity Index ◽

Yellow Vein ◽

Wild Relative ◽

Yellow Vein Mosaic Virus ◽

Progress Curve

AbstractWild relative of okra, Abelmoschus angulosus Wall. ex Wight & Arn. was identified as a resistant germplasm for Okra Yellow Vein Mosaic Virus (OYVMV) which is the devastating disease for okra cultivation in Sri Lanka. The mode of resistance of OYVMV in A. angulosus was studied with the aim of tagging responsible genes for the disease resistance. Wide hybridization was performed between A. angulosus and highly virus susceptible A. esculentus variety, MI-7. Very poor seed setting was observed in F1 and F2 generations due to post zygotic abortion. Disease screening was carried out using F1 and F2:3 populations along with parents in the field under induced disease pressure. Disease severity index and area under disease progress curve were calculated to measure disease severity. Number of genes segregating for OYVMV disease resistance was calculated for the F2:3 generation. Modified Wright's formula was used to estimate the effective gene number and mode of inheritance by a quantitative method. A χ2 test was performed for qualitative analysis. Plants of A. angulosus were totally free of virus incidence while 100% disease incidence was observed in the variety MI-7. F2:3 population showed between and within progeny segregation for disease incidence. Results indicated that the disease susceptibility was dominant over resistance. χ2 analysis revealed that the segregation of disease severity was significantly fit to the gene model of 9:6:1 (χ2 = 0.1757 at P ≤ 0.05) suggesting the disease resistance in A. angulosus is governing by two recessive genes in an additive manner. Result was confirmed by the quantitative analysis.

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Varietal Screening of Okra (Abelmoschus esculentusl. Moench ) Against Okra Yellow Vein Mosaic Virus Under Different Management Practices at Paklihawa, Rupandehi, Nepal

Journal of the Institute of Agriculture and Animal Science ◽

10.3126/jiaas.v35i1.22553 ◽

2018 ◽

Vol 35 (1) ◽

pp. 249-258

Author(s):

R. Poudel ◽

A. Pandey ◽

K. Poudel ◽

A. Chaudhary ◽

N. Ghimire ◽

...

Keyword(s):

Mosaic Virus ◽

Management Practices ◽

Negative Impact ◽

Disease Incidence ◽

Foliar Spray ◽

Yellow Vein ◽

Cow Milk ◽

Yellow Vein Mosaic Virus ◽

Almost All ◽

And Control

The experiment was conducted in the Horticulture farm of Institute of Agriculture and Animal Science, Paklihawa, Rupandehi, Nepal from March, 2017 to June, 2017 to screen the varieties of okra against Okra yellow vein mosaic virus under different management practices. The experiment was laid out in two factorial Split plot design and replicated three times. Five varieties of okra viz. Parvati, Arka Anamika, NOH-15, Super Green and Julie were used and five treatments viz. Jholmol (1:5), Azadiracthin (5ml/L), Imidacloprid (2ml/L), cow milk (100ml/L) and control (distilled water) were used as foliar spray on plants. The chlorophyll content of the leaves was higher in Julie followed by Arka Anamika. The white fly count was found to be reduced after the application of treatments in the succeeding date in almost all varieties. The efficiency of the management practices was found to be significant with Super Green and Julie varieties with least Percent Disease Incidence(PDI) value and in par with each other. Imidacloprid and Azadiractin had the leastPDI value and the combination of Super Green variety with Imidacloprid, Super Green with Jholmol, Super Green with cow milk, Julie with Imidacloprid, NOH-15 with Imidacloprid were found resistant. Similarly, the highest yield was obtained in Julie with Imidaclropid combination. However, due to the maximum waiting period of this chemical as well as its negative impact on human and plant health, Julie with Azadirachtin combination can be suggested to farmers to have eco-friendly management of Okra yellow vein mosaic virus.

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