INDIAN SCIENCE CONGRESS - India Environment Portal

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Proc. 98th Indian Science Congress, Part II : Abstracts of Oral/Poster Presentation
in the form of characteristic small circular, brown coloured patches on the surface
of leaves and these brownish patches grow in size and coalesced to cover the entire
surface of leaves producing blight symptoms. Marked blight symptoms are seen in
the head (capitulum) of heavily infected plants in which seeds are also infected with
Alternaria helianthi. Naturally infected seeds with A. helianthi and artificially
inoculated one showed 38. 6% and 23. 0% reduction in germination respectively.
Shoot and root length of seedlings was also significantly reduced in both cases.
There was a marked increase in number of seedlings showing blight incidence with
increase in spore load of A. helianthi on seeds. Biocontrol of Alternaria blight by
selected natural herbal plant extracts in-vitro has been observed and recommended
for use to the farmers.
59. In vitro Evaluation of Phytoextracts and Fungicides for Curvularia
Lunata
Ashwani Tapwal 1 , Upender Singh 2 , Gurpreet Singh 2 ,
Nandini Gautam 2 and Rajesh Kumar 1
1 Rain Forest Research Institute,
P. B. 136, Deovan,
Jorhat, Assam
2 Shoolini Institute of Life Sciences and Business Management,
Anand Campus, The Mall Solan, HP
Keywords : Curvularia lunata, botanicals, fungicides, IPM
Fungal diseases are serious threats to the plant kingdom and sometime they
cause a heavy mortality in nurseries and field. The genus Curvularia include a
group of phramosporus dematiaceae in which most distinguishing character is the
disproportionately large middle cell or cells of the conidium. C. lunata is very
important pathogens having wide host range infecting grasses, cereals and forest
species. These diseases are often very difficult to control and some losses can
usually be expected during each seedling crop. At present, quick and effective
management of plant diseases is generally achieved by the use of synthetic
pesticides but it is very expensive and also not an environment friendly approach.
The need of hour is to minimize the use of synthetic pesticides by encouraging the