Vol. 3 (6) : November-December 2012 issue
Green Farming Vol. 3 (6) : 720-724 (November-December, 2012)
Impact of fungicides and botanicals on the induction of defense related enzymes in sugarbeet plants against Cercospora beticola
HEMACHANDRA HALLERa1*, G. JADESHAb2 and V. PRAKASAMc3
aDepartment of Plant Pathology, University of Agricultural Sciences, Dharwad 580005 (Karnataka)
bDeptt. of Plant Pathology, Acharya N.G. Ranga Agricultural University, Rajendra Nagar, Hyderabad - 500 030 (A.P.)
cDeptt. of Pl. Pathology, Center for Plant Protection Studies, Tamil Nadu Agricul. University, Coimbatore - 641 003 (T.N.)
Designation : 1,2Ph.D Scholar *(hemachandra.haller@gmail.com), 3Professor
Subject : Plant Pathology, Nematology and Virology, Mushroom Cultivation
Paper No. :
Total Pages : 5
Received : 1 September 2012
Revised accepted : 03 November 2012
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ABSTRACT
There are various biotic and abiotic stress factors cause lower productivity of sugarbeet. Leaf spot in sugarbeet is a major disease caused by Cercospora beticola Sacc. and results in huge crop loss. Plants have endogenous defence mechanisms that can be induced in response to attack by insects and pathogens. Eight fungicides and three plant products, which were found effective under in vitro condition, were used to study the induction of defence reaction in sugarbeet plants under glass house conditions. Accumulation of more phenol and increased activities of PO, PPO and PAL was noticed from 1st day after challenge inoculation with pathogen, reached a maximum on the 3rd day and later showed a declining trend. Application of systemic fungicides was found to induce more concentration of phenol as well as increased activities of all the three enzymes as compared to contact fungicide. Among systemic fungicides, difenoconazole was found to induce more activities of PO (0.948), PPO (0.803), PAL (0.647) enzymes and higher content of phenol (131.32).
Key words :
Cercospora beticola, Defense enzymes, Leaf spot, PO, PPO, PAL, Phenols, Plant extracts, Sugarbeet.
