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2022 Speakers

Hot water and plant extract application in eradicating seed borne and field infection of Septoria leaf spot (Septoria lycopersici Speg ) infecting tomato and improving seed

Sunita Chandel

Sunita Chandel, Speaker at Plant Science and Biology Events
Dr.Y.S.P University of Horticulture and Forestry, India
Title : Hot water and plant extract application in eradicating seed borne and field infection of Septoria leaf spot (Septoria lycopersici Speg ) infecting tomato and improving seed

Abstract:

Septoria leaf spot of tomato (Septoria lycopersici Speg.) is a most devastating foliar pathogen infecting tomatoes world over. The disease produces symptoms with onset of monsoon in Himachal Pradesh, India as small, water soaked, circular to angular spots, with dark brown margins,  spots bearing black pin head sized pycnidia in the greyish centre at the time of maturity. On advancement, spots get coalesced, symptoms slowly developed from lower to upper leaves giving blighted appearance. Morphological studies of the test pathogen revealed suppressive and somewhat fluffy type of colony with dull white to grey colour, undulated margin colony in the pure culture whereas pathogen produced ostiolated and globose pycnidia with an average size of 84mm, conidiophores of 4-12x2-4mm with an average size of 8x3mm in which conidia were hyaline, filiform, multi-septate with the size of 13.7x2.5mm. On the basis of morphological characters, the associated pathogen was identified as Septoria lycopersici Speg. Under pathogenicity test, to prove the Koch’s postulates on cv. “Solan Lalima”, the symptoms of the disease appeared on leaves after 14 days of pathogen inoculation  suggesting incubation period of 336 hours best for occurrence. For disease management, physical and non chemical viz., different hot water treatments, six botanicals/bioformulation were applied to the seeds and in field. HWT at 48°C for 30 min. showed the maximum germination percentage (87.54%) value of seed growth parameters and recorded minimum disease severity and disease incidence of 47.01% and 33.26% ,both as seed treatment and under field conditions. However, in case of botanicals/bioformulations, garlic extract (Allium sativa L.) as seed treatment gave maximum germination percentage (87.69%) and other seed growth parameters with minimum seed infection (4.63%) while under in vitro garlic was most effective and significantly superior to all other treatments with 80.69 per cent inhibition in mycelial growth and also reduced the disease severity and incidence (36.78% and 42.09%) in field followed by beejamrit.

Biography:

Dr. Sunita Chandel studied her BSc Agriculture from College of Agriculture, Solan under Himachal Pradesh Krishi Vishvidhalaya, Palampur, Himachal Pradesh, India and obtained her post graduate degrees in MSc and Ph.D in Mycology & Plant Pathology in years 1987 & 1991, respectively from Dr.Y.S.Parmar University of Horticulture and Forestry, Nauni, Solan (H.P).She joined at Assistant Professor in 1992 in the Department of Plant Pathology of the same University, elevated to Associated Professor in year 2001 and to Professor in year 2009.She was awarded University Merit Fellowship in B.Sc Agriculture, ICAR Junior  Fellowship for Master’s Research, worked as Research fellow in Ph.D programme and as Research Associate before joining the University. Did her post doctorate on the topic “Biological control in horticultural crops”, under Commonwealth Academic Staff Fellowship (2005-06) programme from University of Aberdeen, Scotland, U.K. under the supervision of Steve Woodward and received SERC Fast track research proposal for Young Scientist (2001-2002)-Life Sciences of DST. She has published 125 research articles in SCI journals of National and International repute.

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