Studies on epidemiology and management of yellow vein mosaic virus disease of okra (Abelmoschus esculentus L. Moench)
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Date
2019
Authors
Pankaj
Journal Title
Journal ISSN
Volume Title
Publisher
CCSHAU
Abstract
The present study entitled, “Studies on epidemiology and management of yellow vein mosaic
virus disease of okra (Abelmoschus esculentus L. Moench)” was conducted during the kharif 2018 at
research farm, Department of Plant Pathology, Chaudhary Charan Singh Haryana Agricultural
University, Hisar. Okra yellow vein mosaic virus disease is a devastating viral disease which has a
wide occurrence and causes considerable yield losses quantitatively and qualitatively. The viral disease
can appear at all stages of crop growth depending upon favorable conditions. Environmental factors
play important role in sustaining whitefly population and disease development. It was observed that
whitefly population builds up started in month of July and reached to maximum in first week of
October. The whitefly population and percent disease index (PDI) was observed maximum in first
week of October due to prevailing favourable weather conditions, i.e. maximum temperature 34±2 °C
minimum temperature 23±2 °C, morning relative humidity more than 90 per, wind speed about 3 km/h,
more sunshine hours and no rainfall. The average whitefly population was maximum on Pusa Sawani
(6.54) followed by Pusa A4 (5.27) and Varsha Uphar (3.78). All three cultivars had positive significant
correlation with bright sunshine hours while morning relative humidity and maximum temperature was
recorded positively non-significant. However, evening relative humidity, wind speed and rainfall was
negatively (non-significant) correlated, while minimum temperature was recorded negatively
significant with whitefly population. The maximum and minimum temperature, evening relative
humidity, wind speed, and total rainfall were negatively correlated with OYVMV disease where
morning relative humidity and bright sunshine hours were found positively correlated. The highly
significant positive correlation was found between whitefly population and disease severity. The
terminal PDI was observed highest in Pusa Sawani (73.00 %) cultivar and lowest in Varsha Uphar
(18.75 %). The maximum PDI and disease incidence was observed in 14 July sown crop with wider
row to row spacing while minimum in 15 June sown crop with closely spaced. For the management of
OYVMV disease chemical, botanicals and resistance inducers were used. Amongst all foliar spray of
malathion 50 EC @ 2ml/litre of water + sarpagandha leaf extract @10% was found most effective in
managing the disease with PDI (15.55 %). Amongst the resistance inducers seed priming with salicylic
acid @ 150 mg/litre and spray the same also found effective against OYVMV with PDI (28.89 %).
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