National Academy of Agricultural Sciences (NAAS)
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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 |
Onion is one of the largely cultivated vegetable throughout India and grown as kitchen garden crop in Himachal Pradesh. The bulbs as well as seeds of crop are used in a variety of culinary preparations and holds high nutritive and medicinal value. The commercial cultivation of onion is very successful because of its high demand and market value. The major constraint faced in the cultivation of onions is the incidence of biotic and abiotic factors. Among the various factors inflicting gap in production level, downy mildew is one of the most threatening diseases in the state during the crop period causing heavy economic losses. It is caused by the oomycete Peronospora destructor (Berk.) Casp. ex Berk. which is one of the severely destructing pathogen that affects the crop at every growth stage. Hence, research experiment was carried out at the College of Horticulture, DR. YSPUHF, Nauni, Solan in 2017-18 cropping period to study the effect of SAR chemicals, botanicals and biocontrol agents against downy mildew disease of onion. The research experiment was conducted with 16 treatments with three replications. Treatments were applied before symptom appearance in case of SAR chemicals (3-4 leaf stage) and after symptom appearance in case of botanicals and biocontrol agents. Three sprays were given at 15 days interval, incidence and severity of the disease were recorded before first spraying and 7 days after each spraying using 0-9 scale given by Mohibullah for calculating per cent disease severity (PDS). In this study, the SAR chemical Chitosan (5 mgl-1) was found statistically superior to other treatments. Among botanicals Allium sativum (20%) and Trichoderma viridae (0.8%) among tested bio-agents was found superior.
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