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International Journal of Current Microbiology and Applied Sciences (IJCMAS)
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National Academy of Agricultural Sciences (NAAS)
NAAS Score: *5.38 (2020)
[Effective from January 1, 2020]
For more details click here

ICV 2018: 95.39
Index Copernicus ICI Journals Master List 2018 - IJCMAS--ICV 2018: 95.39
For more details click here

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PRINT ISSN : 2319-7692
Online ISSN : 2319-7706
Issues : 12 per year
Publisher : Excellent Publishers
Email : editorijcmas@gmail.com / submit@ijcmas.com
Editor-in-chief: Dr.M.Prakash
Index Copernicus ICV 2018: 95.39
NAAS RATING 2020: 5.38

Int.J.Curr.Microbiol.App.Sci.2020.9(5): 1-12
DOI: https://doi.org/10.20546/ijcmas.2020.905.001


Epidemiological Studies of Downy Mildew of Onion
Ankita1*, Sunita Chandel1, Rajender Sharma2 and Vijay Kamal Meena3
1Department of Plant pathology, College of Horticulture, Dr. YS Parmar University of Horticulture & Forestry, Nauni, 173230 Solan, India
2Department of Seed Science and Technology , College of Horticulture, Dr. YS Parmar University of Horticulture & Forestry, Nauni, 173230 Solan, India
3Division of Genetics, ICAR-Indian Agricultural Research Institute, New Delhi, India
*Corresponding author
Abstract:

Downy mildew of onion is one of the major threats to onion cultivation, especially in sub-tropical and dry temperate zone, caused by an oomycetes Peronospora destructor (Berk.) Casp. ex Berk. A study was undertaken to investigate into the epidemiological factors that affects the initiation and dispersal of disease. Under in vitro conditions suitability of different temperature and relative humidity regimes, on germination and relative growth of germ tube has been studied. The pathogen preferred a temperature of 15°C as optimum for sporangial germination where the favourable relative humidity was above 95.1 per cent with maximum sporangial germination at 100 per cent. Correspondingly the effect of different meteorological parameters on the appearance and dispersal of the disease were also studied. The maximum temperature, ranging between 21.45 to 26.6 ℃ and minimum temperature in the range of 7.6 to 18.2 ℃ were positively and significantly correlated, where average relative humidity was positively correlated but not significantly. Cumulative rainfall was found negatively correlated showing that rainfall has no specific role in epidemic development. Disease initiated when favourable conditions like temperature and relative humidity prevailed for at least two days.


Keywords: Epidemiology, Onion, Downy mildew, Temperature, Relative humidity
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How to cite this article:

Ankita, Sunita Chandel, Rajender Sharma and Vijay Kamal Meena. 2020. Epidemiological Studies of Downy Mildew of Onion.Int.J.Curr.Microbiol.App.Sci. 9(5): 1-12. doi: https://doi.org/10.20546/ijcmas.2020.905.001