EVALUATION OF PLANT DEFENCE INDUCERS FOR MANAGEMENT OF LEAF BLIGHT OF SUNFLOWER
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Date
2019-09-05
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UNIVERSITY OF AGRICULTURAL SCIENCES GKVK, BENGALURU
Abstract
Sunflower crop suffers from many diseases of which Alternaria blight has been
considered as a potentially destructive disease. In vitro evaluation of plant defense inducers
revealed that maximum inhibition of A. helianthi was recorded in salicylic acid at 200 ppm
(43.79%) followed by monopotassium phosphate at 200 ppm (40.34%). In field conditions,
seed treatment followed by foliar spray of salicylic acid at 100 ppm at 30 and 45 DAS
increased the growth parameters like plant height (215.46cm), stem girth (3.54 cm),
number of leaves (38.43) and chlorophyll content (48.53). Seed treatment followed by
foliar spray of salicylic acid at 100 ppm showed least disease severity (23.33%) at 50
percent flowering with higher yield (2421 Kg ha-1) which was on par with seed treatment
followed by foliar spray of salicylic acid at 50 ppm with disease severity of (23.33%) at
50 per cent flowering and seed yield of 2397 Kg ha-1.The defense enzymes superoxide
dismutase (40.45 μg/50 per cent inhibition) and peroxidase (16.86 μg/ min/ mg protein)
and secondary metabolites such as phenols (73.53 mg/g FW) and flavonoids (68.71mg/g
FW) increased in seed treatment followed by foliar spray of salicylic acid at 100 ppm which
resulted in least disease severity.