Epiphytology of mungbean Yellow Mosaic Virus (MYMV) in Mungbean (Vigna radiata (L.) Wilczek) Under South Gujarat Condition
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Date
2011-06
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Plant Pathology Department, N. M. College of Agriculture Gujarat Agricultural University
Abstract
Mungbean which is also known as green gram (Vigna
radiafa (L.) Wilczek), is the third most important pulse crop
grown in India. Mungbean suffers from several diseases with
substantial losses in yield. Of all the diseases, Mungbean Yellow
Mosaic Virus (MYMV) disease is the most destructive, which
takes heavy toll in Indian subcontinent and adjacent areas of
South-East Asia. Nevertheless, not much work has been carried
out on epiphytology and estimation of yield losses due to the
disease. Therefore, the present investigation was carried out on
the topic entitled "Epiphytology of Mllngbean Yellow Mosaic
Virus (MYMV) in mungbean (Vigna radiala (L.) Wilczek) under
south Gujarat condition".
During the survey, occurrence of Munghean Yellow
Mosaic Virus (MYMV) in munghean was noticed in serious
proportion causing heavy losses in Navsari and Surat district.
The disease incidence in Surat and Navsari districts
ranged from OR.66 to 5H.96 per cent.
Fixed plot surveys were carried out at different field
of NAlJ at different stages of crop in different varieties. None of
the variety showed resistance against the disease. The first
symptoms of the disease was ohserved as early as the first
tri foliate emerged and up-to 79 to 100 per cent incidence was
recorded at the time of crop maturity.
Whiteflies might have brought primary inoculums of
MYMV at-least two kilometers away from the site of experiment
anytime in between 14 days before the sowing of crop to the 4
days after the sowing of crop to inoculate the pathogen at the
site of experimentation immediately after the emergence of the
crop. Then, the virus might have spread from one plant to other
plants through its vector, whitefly.
Maximum numbers of whiteflies (148) were trapped
at North East direction. Whereas 128, 123 and 123 whiteflies
were observed in North West, South East, South West direction
respectively during summer 20 I O. Average number of whiteflies
on 10 plants ranged from 0 to 2.5.
Whitefly population had signi ficant • • positIve
correlation with maximum temperature, average temperature and
relative humidity. In the present investigation 3SoC • ma:(\mum
temperature, 31 .1 °C mean temperature, 90 % morning RH. 53 OJ,
,
•
a fter noon RH and 71.5 % mean R H found to be optimum for the
build-up of whitefly population.
Disease incidence was found significantly positively
correlated with whitefly population. Minimum temperature,
average temperature, afternoon relative humidity, average
relative humidity and wind velocity found to be positively
correlated with MYMV incidence .
The multiple linear regression equation showed that
different weather parameters were together responsible for the
whitefly population to the extent of 90.38 per cent.
Weather factor (Minimum temperature) was
responsible for the disease incidence to the extent of 94.32 per
cent .
The potential yield losses due to the disease depend
upon the stage of infection. An early infected plant suffers 74.50
per cent loss. The plot which was completely protected by the
spraying of systemic insecticide yielded 32.59 per cent more
yield than the field left unsprayed.
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Citation
PATEL VINAY KUMAR DAHYABHAI_46439